SMSC CAP1214 Multiple channel capacitive touch sensor and led driver Datasheet

CAP1214
Multiple Channel Capacitive Touch
Sensor and LED Driver
PRODUCT FEATURES
Datasheet
General Description
Features
The CAP1214 is a multiple channel Capacitive Touch
sensor and LED Driver.1
„
The CAP1214 contains up to fourteen (14) individual
Capacitive Touch sensor inputs with programmable
sensitivity for use in touch button and slider switch
applications. Each sensor input contains automatic
recalibration with programmable time delays.
The CAP1214 includes compensation circuitry that
provides uniform touch sensitivity across a wide range
of external sensing pad capacitance.
The CAP1214 also contains eleven (11) low side LED
drivers that offer full-on / off, variable rate blinking,
dimness controls, and breathing. LED outputs can be
linked to capacitive sensor channels.
—
—
—
—
—
—
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„
„
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Compensates for variable sensing pads
Programmable sensitivity
High SNR allows for easy tuning
Automatic recalibration
Slider acceleration and position detection
Proximity detection
Lid closure detection
Low power operation
— 4.5uA quiescent current in Deep Sleep
— 250uA quiescent current in Sleep, monitoring 1 button
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„
„
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Applications
„
Fourteen (14) capacitive touch sensor inputs
FEEDBACK pin can drive a piezo transducer when a
touch is detected
User controlled reset
Low external component count
SMBus 2.0 compliant interface to change operating
parameters to work in a wide variety of systems
— Block Read and Write function for quick tasking
Consumer Electronics
Desktop and Notebook PCs
LCD Monitors
„
Eleven (11) LED driver outputs
— Programmable blink, breathe, and dimness controls
— 8 configurable as GPIOs
— LEDs can be linked to capacitive sensor channels
„
1. SMSC and the SMSC logo are registered trademarks and
SMSC RightTouch is a trademark of Standard Microsystems
Corporation ("SMSC").
„
Development boards and software available
Available in 32-pin 5mm x 5mm QFN Lead-free
RoHS Compliant package
Block Diagram
LED2
LED1
LED4
LED3
LED6
LED5
LED8
LED7
LED10
LED9
LED11
RESET
LED Blink, Breathe, and Dimness control
Capacitive Sensing Algorithm
VDD GND
SMBus
Slave
Protocol
SMCLK
SMDATA
ALERT
FEEDBACK
CS1
CS3
CS2
SMSC CAP1214
CS5
CS4
CS7
CS6
CS9
CS8
CS13
CS11
CS14
CS10
CS12
DATASHEET
Revision 1.0 (08-30-10)
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Ordering Information:
ORDERING NUMBER
CAP1214-1-EZK-TR
PACKAGE
32-Pin QFN 5mm x 5mm
(Lead Free RoHS compliant)
FEATURES
Fourteen Capacitive Touch Sensors.
Eleven LED drivers. SMBus
communications.
REEL SIZE IS 4,000 PIECES
This product meets the halogen maximum concentration values per IEC61249-2-21
For RoHS compliance and environmental information, please visit www.smsc.com/rohs
Please contact your SMSC sales representative for additional documentation related to this product
such as application notes, anomaly sheets, and design guidelines.
Copyright © 2010 SMSC or its subsidiaries. All rights reserved.
Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for
construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC
reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications
before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent
rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated
version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors
known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not
designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property
damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of
this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered
trademark of Standard Microsystems Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders.
The Microchip name and logo, and the Microchip logo are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.
SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE
OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL
DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT;
TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD
TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
Revision 1.0 (08-30-10)
2
DATASHEET
SMSC CAP1214
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table of Contents
Chapter 1 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Chapter 2 Delta from CAP1114 to CAP1214 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1
2.2
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Register Delta . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Chapter 3 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Chapter 4 Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.1
4.2
System Management Bus Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1.1
SMBus Start Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1.2
SMBus Address and RD / WR Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1.3
SMBus Data Bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1.4
SMBus ACK and NACK Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1.5
SMBus Stop Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1.6
SMBus Time-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1.7
SMBus and I2C Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SMBus Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.1
SMBus Write Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.2
Block Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.3
SMBus Read Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.4
Block Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.5
SMBus Send Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.6
SMBus Receive Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18
18
18
18
19
19
19
19
19
20
20
20
20
21
21
Chapter 5 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
Power States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RESET Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LED Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.1
Linking LEDs to Capacitive Touch Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Capacitive Touch Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4.1
Multiple Button Presses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4.2
Lid Closure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4.3
Grouped Sensors (CS8 - CS14) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4.4
Sensing Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4.5
Proximity Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4.6
Recalibrating Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4.7
Low Frequency Noise Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4.8
RF Noise Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grouped Sensor Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.5.1
Tap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.5.2
Press and Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.5.3
Slider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.5.4
Relative Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.5.5
Slider Velocity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ungrouped Sensor Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.6.1
CS9 - CS13 Ungrouped Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.6.2
CS8 and CS14 Ungrouped Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FEEDBACK Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ALERT Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.8.1
Button Interrupt Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SMSC CAP1214
3
DATASHEET
23
25
25
25
26
26
26
26
26
26
26
27
27
27
27
27
28
28
28
28
28
28
29
29
29
Revision 1.0 (08-30-10)
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
5.8.2
Grouped Sensor Interrupt Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Chapter 6 Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
6.10
6.11
6.12
6.13
6.14
6.15
6.16
6.17
6.18
6.19
6.20
6.21
6.22
6.23
6.24
6.25
6.26
6.27
6.28
6.29
6.30
6.31
6.32
6.33
6.34
6.35
6.36
6.37
6.38
Main Status Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Button Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2.1
Button Status 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2.2
Button Status 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Build Revision Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Slider Position / Volumetric Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4.1
Absolute Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4.2
Volumetric Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vendor ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Volumetric Step Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Noise Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lid Closure Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GPIO Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Group Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sensor Delta Count Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Queue Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Sensitivity Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sensor Enable Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Button Configuration Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Group Configuration Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Group Configuration Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibration Enable Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibration Activate Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.20.1 Calibration Activate - 26h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.20.2 Grouped Sensor Calibration Activate - 46h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interrupt Enable Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.21.1 Interrupt Enable 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.21.2 Interrupt Enable 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sleep Channel Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multiple Touch Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lid Closure Configuration Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lid Closure Queue Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lid Closure Pattern Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recalibration Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sensor Threshold Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Button Noise Threshold Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.29.1 Button Noise Threshold 1 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.29.2 Button Noise Threshold 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lid Closure Threshold Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.30.1 Lid Closure Threshold 1 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.30.2 Lid Closure Threshold 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.30.3 Lid Closure Threshold 3 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.30.4 Lid Closure Threshold 4 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Slider Velocity Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Recalibration Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grouped Sensor Channel Enable Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Proximity Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sampling Channel Select Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sampling Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sensor Base Count Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Revision 1.0 (08-30-10)
4
DATASHEET
41
42
42
43
43
44
44
45
45
45
46
46
47
47
48
49
50
51
52
53
55
56
57
57
58
58
58
59
59
60
61
62
62
63
63
65
66
66
66
67
67
67
68
68
68
70
70
72
73
74
75
75
SMSC CAP1214
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
6.39
6.40
6.41
6.42
6.43
6.44
6.45
6.46
6.47
6.48
6.49
6.50
6.51
6.52
6.53
6.54
6.55
6.56
6.57
6.58
6.59
6.60
6.61
6.62
LED Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
6.39.1 LED Status 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
6.39.2 LED Status 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Feedback Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Feedback Channel Configuration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
6.41.1 Feedback Channel Configuration 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
6.41.2 Feedback Channel Configuration 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Feedback One-Shot Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
LED / GPIO Direction Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
LED / GPIO Output Type Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
GPIO Input Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
LED Output Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
6.46.1 LED Output Control 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
6.46.2 LED Output Control 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
LED Polarity Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
6.47.1 LED Polarity 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
6.47.2 LED Polarity 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Linked LED Transition Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
6.48.1 Linked LED Transition Control 1 - 77h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
6.48.2 Linked LED Transition Control 2 - 78h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
LED Mirror Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
6.49.1 LED Mirror Control 1 - 79h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
6.49.2 LED Mirror Control 2 - 7Ah . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Sensor LED Linking Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
LED Behavior Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
6.51.1 LED Behavior 1 - 81h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
6.51.2 LED Behavior 2 - 82h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
6.51.3 LED Behavior 3 - 83h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
LED Pulse 1 Period Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
LED Pulse 2 Period Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
LED Breathe Period Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
LED Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
LED11 Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
LED Pulse and Breathe Duty Cycle Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
LED Direct Ramp Rates Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
LED Off Delay Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Sensor Calibration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Revision Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Chapter 7 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
7.1
7.2
Package Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Package Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Chapter 8 Datasheet Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
SMSC CAP1214
5
DATASHEET
Revision 1.0 (08-30-10)
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
List of Figures
Figure 1.1
Figure 4.1
Figure 5.1
Figure 5.2
Figure 5.3
Figure 5.4
Figure 5.5
Figure 5.6
Figure 5.7
Figure 6.1
Figure 6.2
Figure 6.3
Figure 6.4
Figure 6.5
Figure 6.6
Figure 6.7
Figure 6.8
Figure 7.1
Figure 7.2
Figure 7.3
Figure 7.4
Figure 7.5
Figure 7.6
Figure 7.7
CAP1214 Pin Diagram (32-Pin QFN). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
System Diagram for CAP1214 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Button Interrupt Behavior - Repeat Rate Enabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Button Interrupt Behavior - No Repeat Rate Enabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Tap Interrupt Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Press and Hold Interrupt Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Slide Interrupt Behavior - No Acceleration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Slide Interrupt Behavior - Acceleration Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Pulse 1 Behavior with Touch Trigger and Non-inverted Polarity . . . . . . . . . . . . . . . . . . . . . . 90
Pulse 1 Behavior with Touch Trigger and Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Pulse 2 Behavior with Non-Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Pulse 2 Behavior with Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Breathe Behavior with Non-Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Breathe Behavior with Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Direct Behavior for Non-Inverted Polarity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Direct Behavior for Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Package Diagram - 32-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Package Dimensions - 32-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Package PCB Land Pattern and Stencil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Package Detail A - Stencil Opening and Perimeter Lands. . . . . . . . . . . . . . . . . . . . . . . . . . 104
Package Detail B - Thermal Vias and Stencil Opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Package Land Pattern Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Package Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Revision 1.0 (08-30-10)
6
DATASHEET
SMSC CAP1214
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
List of Tables
Table 1.1 Pin Description for CAP1214 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 1.2 Pin Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 2.1 Register Delta . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 3.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 3.2 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 4.1 Protocol Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 4.2 Write Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 4.3 Block Write Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 4.4 Read Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 4.5 Block Read Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 4.6 Send Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 4.7 Receive Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 5.1 Power States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 6.1 Register Set in Hexadecimal Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 6.2 Main Status Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Table 6.3 Button Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 6.4 Build Revision Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Table 6.5 Slider Position / Volumetric Data Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Table 6.6 Example Slider Absolute Position Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Table 6.7 Vendor ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Table 6.8 Volumetric Step Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Table 6.9 Noise Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Table 6.10 Lid Closure Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Table 6.11 GPIO Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Table 6.12 Group Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Table 6.13 Sensor Delta Count Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Table 6.14 Queue Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Table 6.15 QUEUE_B Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Table 6.16 Data Sensitivity Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Table 6.17 DELTA_SENSE Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Table 6.18 BASE_SHIFT Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Table 6.19 Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Table 6.20 Sensor Enable Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Table 6.21 Button Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Table 6.22 MAX_DUR_B and MAX_DUR_G Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Table 6.23 RPT_RATE_B / SL / PH Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Table 6.24 Group Configuration Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table 6.25 M_PRESS Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table 6.26 Group Configuration Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Table 6.27 Calibration Enable Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Table 6.28 Calibration Activate Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Table 6.29 Interrupt Enable Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Table 6.30 Sleep Channel Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Table 6.31 Multiple Touch Configuration Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Table 6.32 B_MULT_T Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Table 6.33 G_MULT_T Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Table 6.34 Lid Closure Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Table 6.35 Lid Closure Queue Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Table 6.36 Lid Closure Pattern Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Table 6.37 Recalibration Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Table 6.38 NEG_DELTA_CNT Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Table 6.39 CAL_CFG Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Table 6.40 Sensor Threshold Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
SMSC CAP1214
7
DATASHEET
Revision 1.0 (08-30-10)
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 6.41 Button Noise Threshold Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Table 6.42 CSx_BN_TH Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Table 6.43 Lid Closure Threshold Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Table 6.44 CSx_LD_TH Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Table 6.45 Slider Velocity Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Table 6.46 MAX_INT Bit Decode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Table 6.47 SLIDE_TIME Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Table 6.48 RPT_SCALE Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Table 6.49 Digital Recalibration Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Table 6.50 Configuration 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Table 6.51 Grouped Sensor Channel Enable Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Table 6.52 Proximity Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Table 6.53 PROX_AVG Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Table 6.54 Sampling Channel Select Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Table 6.55 Sampling Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Table 6.56 OVERSAMP_RATE Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Table 6.57 Sensor Base Count Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Table 6.58 LED Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Table 6.59 Feedback Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Table 6.60 FDBK_DUR Bit Decode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Table 6.61 Feedback Channel Configuration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Table 6.62 Feedback One-Shot Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Table 6.63 LED / GPIO Direction Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Table 6.64 LED / GPIO Output Type Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Table 6.65 GPIO Input Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Table 6.66 LED Output Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Table 6.67 LED Polarity Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Table 6.68 LED Polarity Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Table 6.69 Linked LED Transition Control Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Table 6.70 LED Mirror Control Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Table 6.71 Sensor LED Linking Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Table 6.72 LED Behavior Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Table 6.73 LEDx_CTL Bit Decode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Table 6.74 LED Pulse 1 Period Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Table 6.75 LED Pulse / Breathe Period Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Table 6.76 LED Pulse 2 Period Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Table 6.77 LED Breathe Period Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Table 6.78 LED Configuration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Table 6.79 PULSE_CNT Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Table 6.80 LED Configuration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Table 6.81 LED11_STEPS Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Table 6.82 LED11_CLK Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Table 6.83 LED Period and Breathe Duty Cycle Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Table 6.84 LED Duty Cycle Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Table 6.85 LED Direct Ramp Rates Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Table 6.86 Rise / Fall Rate Cycle Decode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Table 6.87 LED Off Delay Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Table 6.88 Breathe Off Delay Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Table 6.89 Direct Off Delay Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Table 6.90 Sensor Calibration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Table 6.91 Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Table 6.92 Revision Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Table 8.1 Customer Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Revision 1.0 (08-30-10)
8
DATASHEET
SMSC CAP1214
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
CS7
CS6
CS5
CS4
CS3
CS2
CS1
N/C*
32
31
30
29
28
27
26
25
Chapter 1 Pin Description
* Connect to ground.
CS8
1
24
FEEDBACK
CS9
2
23
RESET
CS10
3
22
SMCLK
CS11
4
21
SMDATA
20
ALERT
GND
LED2 / GPIO2
LED1 / GPIO1
16
LED9
LED8 / GPIO8
17
15
8
LED7 / GPIO7
VDD
14
LED10
LED6 / GPIO6
18
13
7
LED5 / GPIO5
CS14
12
LED11
LED4 / GPIO4
19
11
6
LED3 / GPIO3
CS13
10
5
9
CS12
Figure 1.1 CAP1214 Pin Diagram (32-Pin QFN)
Table 1.1 Pin Description for CAP1214
PIN #
PIN NAME
PIN FUNCTION
PIN
TYPE
UNUSED
CONNECTION
1
CS8
Capacitive Touch Sensor 8
AIO
Connect to Ground
2
CS9
Capacitive Touch Sensor 9
AIO
Connect to Ground
3
CS10
Capacitive Touch Sensor 10
AIO
Connect to Ground
4
CS11
Capacitive Touch Sensor 11
AIO
Connect to Ground
5
CS12
Capacitive Touch Sensor 12
AIO
Connect to Ground
6
CS13
Capacitive Touch Sensor 13
AIO
Connect to Ground
7
CS14
Capacitive Touch Sensor 14
AIO
Connect to Ground
SMSC CAP1214
9
DATASHEET
Revision 1.0 (08-30-10)
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 1.1 Pin Description for CAP1214 (continued)
PIN #
PIN NAME
PIN FUNCTION
PIN
TYPE
UNUSED
CONNECTION
8
VDD
Positive Power supply
Power
n/a
LED1 - Open drain LED driver
OD (5V)
Connect to Ground
GPI1 - GPIO 1 input (default)
DI (5V)
Connect to Ground
GPO1 - GPIO 1 push-pull output
DO
Leave open
LED2 - Open drain LED driver
OD (5V)
Connect to Ground
GPI2 - GPIO 2 input (default)
DI (5V)
Connect to Ground
GPO2 - GPIO 2 push-pull output
DO
Leave open
LED3 - Open drain LED driver
OD (5V)
Connect to Ground
GPI3 - GPIO 3 input (default)
DI (5V)
Connect to Ground
GPO3 - GPIO 3 push-pull output
DO
Leave open
LED4 - Open drain LED driver
OD (5V)
Connect to Ground
GPI4 - GPIO 4 input (default)
DI (5V)
Connect to Ground
GPO4 - GPIO 4 push-pull output
DO
Leave open
LED5 - Open drain LED driver
OD (5V)
Connect to Ground
GPI5 - GPIO 5 input (default)
DI (5V)
Connect to Ground
GPO5 - GPIO 5 push-pull output
DO
Leave open
LED6 - Open drain LED driver
OD (5V)
Connect to Ground
GPI6 - GPIO 6 input (default)
DI (5V)
Connect to Ground
GPO6 - GPIO 6 push-pull output
DO
Leave open
LED7 - Open drain LED driver
OD (5V)
Connect to Ground
GPI7 - GPIO 7 input (default)
DI (5V)
Connect to Ground
GPO7 - GPIO 7 push-pull output
DO
Leave open
LED8 - Open drain LED driver
OD (5V)
Connect to Ground
GPI8 - GPIO 8 input (default)
DI (5V)
Connect to Ground
GPO8 - GPIO 8 push-pull output
DO
Leave open
9
10
11
12
13
14
15
16
LED1 /
GPIO1
LED2 /
GPIO 2
LED3 /
GPIO3
LED4 /
GPIO4
LED5 /
GPIO5
LED6 /
GPIO6
LED7 /
GPIO7
LED8 /
GPIO8
17
LED9
LED9 - Open drain LED driver
OD (5V)
Connect to Ground
18
LED10
LED10 - Open drain LED driver
OD (5V)
Connect to Ground
19
LED11
LED11 - Open drain LED driver
OD (5V)
Connect to Ground
20
ALERT
Active High Interrupt / Wake Up Input
DIO
21
SMDATA
Bi-directional SMBus data - requires pull-up
resistor
DIOD
(5V)
n/a
22
SMCLK
SMBus clock input - requires pull-up resistor
DI (5V)
n/a
Revision 1.0 (08-30-10)
10
DATASHEET
Pull-down resistor
SMSC CAP1214
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 1.1 Pin Description for CAP1214 (continued)
PIN
TYPE
UNUSED
CONNECTION
Soft reset for system - resets all registers to
default values
DI (5V)
Connect to Ground
FEEDBACK
Sensor press feedback output.
DO
Leave open
25
N/C
Not Connected
N/A
Connect to Ground
26
CS1
Capacitive Touch Sensor 1
AIO
Connect to Ground
27
CS2
Capacitive Touch Sensor 2
AIO
Connect to Ground
28
CS3
Capacitive Touch Sensor 3
AIO
Connect to Ground
29
CS4
Capacitive Touch Sensor 4
AIO
Connect to Ground
30
CS5
Capacitive Touch Sensor 5
AIO
Connect to Ground
31
CS6
Capacitive Touch Sensor 6
AIO
Connect to Ground
32
CS7
Capacitive Touch Sensor 7
AIO
Connect to Ground
Bottom
Plate
GND
Power Ground
Power
n/a
PIN #
PIN NAME
PIN FUNCTION
23
RESET
24
The pin types are described in Table 1.2, "Pin Types". All pins labeled with (5V) are 5V tolerant.
Note: For all 5V tolerant pins that require a pull-up resistor, the voltage difference between VDD and
the pull-up voltage must never exceed 3.6V.
Table 1.2 Pin Types
PIN TYPE
AIO
DI
DIOD
DESCRIPTION
Analog Input / Output - this pin is used as an I/O for analog signals.
Digital Input - this pin is used as a digital input. This pin is 5V tolerant.
Digital Input / Open Drain Output - this pin is used as an digital I/O. When it is used as an
output, It is open drain and requires a pull-up resistor. This pin is 5V tolerant.
DO
Push-pull Digital Output - this pin is used as a digital output and can sink and source current.
OD
Open Drain Digital Output - this pin is used as a digital output. It is open drain and requires a
pull-up resistor. This pin is 5V tolerant.
Power
SMSC CAP1214
This pin is used to supply power or ground to the device.
11
DATASHEET
Revision 1.0 (08-30-10)
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Chapter 2 Delta from CAP1114 to CAP1214
2.1
Summary
1. Updated Product ID to 5Ah.
2. Changed pin 24 from N/C to FEEDBACK.
3. Increased RESET Pin release to fully active operation from 400ms typical and 500ms max to
675ms typical and 775ms max (see Table 3.2, "Electrical Specifications").
4. Reduced Time to First Conversion from 400ms typical and 500ms max to 100ms typical and 200ms
max (see Table 3.2, "Electrical Specifications").
5. Added Time to First Valid Detection 675ms typical and 775ms max (see Table 3.2, "Electrical
Specifications").
6. Added Power Supply Rejection ±310 counts / V typical (see Table 3.2, "Electrical Specifications").
7. Added bits 5 and 4 to the Queue Control register (1Eh - see Section 6.12, "Queue Control
Register"). These bits control whether the accumulation of intermediate data and the consecutive
negative delta counts counter are cleared when the noise status bit is set.
8. Added the following registers to implement the new Feedback feature, which enables the CAP1214
to activate an external transducer to send end user feedback in the form of sound or vibration when
a touch is detected: Feedback Configuration (62h - see Section 6.40, "Feedback Configuration
Register"), Feedback Channel Configuration (63h and 64h - see Section 6.41, "Feedback Channel
Configuration Registers"), and Feedback One-Shot (65h - see Section 6.42, "Feedback One-Shot
Register").
9. Added LED11_CFG control as bit 5 of the Configuration 2 register (40h - see Section 6.33,
"Configuration 2 Register"). This controls whether frequency of the LED11 driver is set at ~2000Hz
or is configurable.
10. Added the LED11 Configuration register (8Ah) to determine base frequency and step settings for
LED11.
11. Corrected anomaly where rise rate overrode any non-zero fall rate (Section 6.58, "LED Direct
Ramp Rates Register").
12. Corrected anomaly where Pulse 1 behavior failed on alternate presses when a sensor was linked
to an LED and the Pulse 1 start trigger was set to “release”.
13. Corrected anomaly where the delta counts were not cleared when the RF Detector circuit detected
excessive RF signal on a capacitive sensor input.
14. Pulse 2 behavior modified. The number of pulses after release is the programmed number, not the
programmed number minus one (see Section 6.53, "LED Pulse 2 Period Register").
15. Breathe behavior modified. A breathe off delay control was added to the LED Off Delay Register
(see Section 6.59, "LED Off Delay Register") so the LED can be configured to remain inactive
between breathes.
16. When the device enters the Deep Sleep state, the Slider Position / Volumetric Data Register (06h)
is not cleared, if the register is set to represent volumetric data. If set to represent position
information, the register is cleared.
17. Updated circuitry to improve power supply rejection.
18. Renamed BLK_DIG_NOISE bit to DIS_DIG_NOISE, and renamed BLK_ANA_NOISE bit to
DIS_ANA_NOISE (see Section 6.14, "Configuration Register"). Renamed BLK_RF_NOISE bit to
DIS_RF_NOISE (see Section 6.33, "Configuration 2 Register").
Revision 1.0 (08-30-10)
12
DATASHEET
SMSC CAP1214
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
2.2
Register Delta
Table 2.1 Register Delta
ADDRESS
REGISTER DELTA
DELTA
DEFAULT
Added controls
Added bit 5 NO_CLR_INTD and bit 4
NO_CLR_NEG to Queue Control
Register
03h
Added control
Added bit 5 LED11_CFG to Configuration
2 Register
00h
62h
New
Feedback Configuration
00h
63h
New
Feedback Channel Configuration 1
00h
64h
New
Feedback Channel Configuration 2
00h
65h
New
Feedback One-Shot
00h
8Ah
New
LED11 Configuration
00h
Added control
Added bits 6-4 BR_OFF_DLY[2:0] to LED
Off Delay Register
00h
Changed
Product ID changed.
5Ah
1Dh
40h
95h
FDh
SMSC CAP1214
13
DATASHEET
Revision 1.0 (08-30-10)
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Chapter 3 Electrical Specifications
Table 3.1 Absolute Maximum Ratings
Voltage on VDD pin
-0.3 to 4
V
Voltage on 5V tolerant pins (V5VT_PIN)
-0.3 to 5.5
V
Voltage on 5V tolerant pins (|V5VT_PIN - VDD|) (see Note 3.1)
0 to 3.6
V
Voltage on any other pin to GND
-0.3 to VDD + 0.3
V
Package Power Dissipation up to TA = 85°C (see Note 3.2)
1
W
Junction to Ambient (θJA) (see Note 3.3)
48
°C/W
Operating Ambient Temperature Range
-40 to 125
°C
Storage Temperature Range
-55 to 150
°C
ESD Rating, All Pins, HBM
8000
V
Note: Stresses above those listed could cause permanent damage to the device. This is a stress
rating only and functional operation of the device at any other condition above those indicated
in the operation sections of this specification is not implied.
Note 3.1
For the 5V tolerant pins that have a pull-up resistor, the pull-up voltage must not exceed
3.6V when the device is unpowered.
Note 3.2
The Package Power Dissipation specification assumes a thermal via design with the
thermal landing be soldered to the PCB ground plane with 0.3mm (12mil) diameter vias in
a 4x4 matrix at 0.9mm (35.4mil) pitch.
Note 3.3
Junction to Ambient (θJA) is dependent on the design of the thermal vias. Without thermal
vias and a thermal landing, the θJA is approximately 60°C/W including localized PCB
temperature increase.
Table 3.2 Electrical Specifications
VDD = 3V to 3.6V, TA = 0°C to 85°C, all Typical values at TA = 27°C unless otherwise noted.
CHARACTERISTIC
SYMBOL
MIN
TYP
MAX
UNIT
CONDITIONS
DC Power
Supply Voltage
Supply Current
Revision 1.0 (08-30-10)
VDD
3.0
3.3
3.6
V
IDD
0.55
1
mA
Average current
Capacitive Sensing Active,
LEDs enabled
ISLEEP
250
400
uA
Sleep state active, 1 sensor
monitored; LED11 inactive
TA < 85°C
IDSLEEP
4.5
15
uA
Deep Sleep, LED 11 inactive
TA < 40°C
14
DATASHEET
SMSC CAP1214
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 3.2 Electrical Specifications (continued)
VDD = 3V to 3.6V, TA = 0°C to 85°C, all Typical values at TA = 27°C unless otherwise noted.
CHARACTERISTIC
SYMBOL
Time to
Communications
MIN
TYP
MAX
UNIT
CONDITIONS
tCOMM
15
20
ms
Time from power applied to
communications active
Time to First
Conversion
tCONV
100
200
ms
Time from power applied to first
sensor sampled
Time to First Valid
Detection
tCONV
675
775
ms
Time from power applied to first
valid data
Capacitive Touch Sensor
Base Capacitance
CBASE
5
50
pF
Pad untouched
Detectable
Capacitive Shift
ΔCTOUCH
0.1
2
pF
Pad touched
Sample Time
tTOUCH
2.5
ms
Update Time
ΔtTOUCH
35
ms
Recalibration Interval
ΔtCAL
8
s
Power Supply
Rejection
PSR
±310
counts
/V
Automatic Recalibration active,
no touch active, default settings
LED / GPIO Drivers (LED / GPIO 1 - 8)
Duty Cycle
DUTYLED
0
100
Drive Frequency
fLED
Sinking Current
ISINK
24
mA
VOL = 0.4
Sourcing Current
ISOURCE
24
mA
VOH = VDD - 0.4
Input High Voltage
VIH
V
LED / GPIO configured as input
Input Low Voltage
VIL
V
LED / GPIO configured as input
%
Programmable
2
%
Programmable
kHz
2.0
0.8
LED Drivers (LED 9 - LED 10)
Duty Cycle
DUTYLED
Drive Frequency
fLED
Sinking Current
ISINK
24
mA
Output Low Voltage
VOL
0.4
V
ISINK = 24mA
%
Programmable
kHz
Programmable
0
100
2
kHz
LED11 Driver
Duty Cycle
DUTYLED
Drive Frequency
fLED
Sinking Current
ISINK
48
mA
Output Low Voltage
VOL
0.4
V
SMSC CAP1214
0
100
2
15
DATASHEET
ISINK = 48mA
Revision 1.0 (08-30-10)
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 3.2 Electrical Specifications (continued)
VDD = 3V to 3.6V, TA = 0°C to 85°C, all Typical values at TA = 27°C unless otherwise noted.
CHARACTERISTIC
SYMBOL
MIN
TYP
MAX
UNIT
CONDITIONS
I/O Pins - SMDATA, SMCLK, and ALERT Pins
Output Low Voltage
VOL
Output High Voltage
VOH
Input High Voltage
VIH
Input Low Voltage
VIL
0.8
V
Leakage Current
ILEAK
±5
uA
powered or unpowered
TA < 85°C
pull-up voltage < VDD
V
ISINK_IO = 24mA
V
ISOURCE_IO = 24mA
0.4
V
ISINK_IO = 8mA
VDD 0.4
V
ALERT pin active high and
asserted
ISOURCE_IO = 8mA
2.0
V
FEEDBACK Pin
Output Low Voltage
VOL
Output High Voltage
VOH
0.4
VDD 0.4
RESET Pin
Input High Voltage
VIH
Input Low Voltage
VIL
RESET Filter Time
tRST_FILT
RESET Pin release
to fully active
operation
tRST_ON
2.0
V
0.8
10
V
ms
675
775
ms
SMBus Timing
Input Capacitance
CIN
5
pF
10
400
kHz
50
ns
Clock Frequency
fSMB
Spike Suppression
tSP
Bus free time Start to
Stop
tBUF
1.3
us
Hold Time: Start
tHD:STA
0.6
us
Setup Time: Start
tSU:STA
0.6
us
Setup Time: Stop
tSU:STO
0.6
us
Data Hold Time
tHD:DAT
0
us
Data Setup Time
tSU:DAT
0.6
us
Clock Low Period
tLOW
1.3
us
Clock High Period
tHIGH
0.6
us
Clock/Data Fall time
tFALL
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300
16
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ns
Min = 20+0.1CLOAD ns
SMSC CAP1214
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 3.2 Electrical Specifications (continued)
VDD = 3V to 3.6V, TA = 0°C to 85°C, all Typical values at TA = 27°C unless otherwise noted.
CHARACTERISTIC
SYMBOL
Clock/Data Rise time
Capacitive Load
SMSC CAP1214
MIN
TYP
MAX
UNIT
CONDITIONS
tRISE
300
ns
Min = 20+0.1CLOAD ns
CLOAD
400
pF
per bus line
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Chapter 4 Communications
The CAP1214 communicates via the SMBus or I2C communications protocols.
APPLICATION NOTE: Upon power up, the CAP1214 will not respond to any SMBus communications until “time to
communications” has elapsed (see Table 3.2, "Electrical Specifications"). After this time, full
functionality is available.
4.1
System Management Bus Protocol
The CAP1214 communicates with a host controller, such as an SMSC SIO, through the SMBus. The
SMBus is a two-wire serial communication protocol between a computer host and its peripheral
devices. A detailed timing diagram is shown in Figure 4.1. Stretching of the SMCLK signal is supported;
however, the CAP1214 will not stretch the clock signal.
T HIGH
T LOW
T HD:STA
T SU:STO
T FALL
SMCLK
T RISE
T HD:STA
T SU:DAT
T HD:DAT
T SU:STA
SMDATA
TBUF
P
S
S
S - Start Condition
P - Stop Condition
P
Figure 4.1 SMBus Timing Diagram
4.1.1
SMBus Start Bit
The SMBus Start bit is defined as a transition of the SMBus Data line from a logic ‘1’ state to a logic
‘0’ state while the SMBus Clock line is in a logic ‘1’ state.
4.1.2
SMBus Address and RD / WR Bit
The SMBus Address Byte consists of the 7-bit client address followed by the RD / WR indicator bit. If
this RD / WR bit is a logic ‘0’, the SMBus Host is writing data to the client device. If this RD / WR bit
is a logic ‘1’, the SMBus Host is reading data from the client device.
The CAP1214 responds to the slave address 0101_000xb. Multiple addressing options are available.
For more information contact SMSC.
4.1.3
SMBus Data Bytes
All SMBus Data bytes are sent most significant bit first and composed of 8-bits of information.
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4.1.4
SMBus ACK and NACK Bits
The SMBus client will acknowledge all data bytes that it receives. This is done by the client device
pulling the SMBus Data line low after the 8th bit of each byte that is transmitted. This applies to both
the Write Byte and Block Write protocols.
The Host will NACK (not acknowledge) the last data byte to be received from the client by holding the
SMBus data line high after the 8th data bit has been sent. For the Block Read protocol, the Host will
ACK each data byte that it receives except the last data byte.
4.1.5
SMBus Stop Bit
The SMBus Stop bit is defined as a transition of the SMBus Data line from a logic ‘0’ state to a logic
‘1’ state while the SMBus clock line is in a logic ‘1’ state. When the CAP1214 detects an SMBus Stop
bit, and it has been communicating with the SMBus protocol, it will reset its client interface and prepare
to receive further communications.
4.1.6
SMBus Time-out
The CAP1214 includes an SMBus time-out feature. Following a 30ms period of inactivity on the SMBus
where the SMCLK pin is held low, the device will time-out and reset the SMBus interface.
The time-out function defaults to disabled. It can be enabled by setting the TIMEOUT bit in the
Configuration register (see Section 6.14).
4.1.7
SMBus and I2C Compliance
The major differences between SMBus and I2C devices are highlighted here. For complete compliance
information, refer to the SMBus 2.0 specification.
1. Minimum frequency for SMBus communications is 10kHz. There is no minimum frequency for I2C.
2. For SMBus communications, the client protocol will reset if the clock is held low longer than 30ms.
3. For SMBus communications, the client protocol will reset if both the clock and the data line are
high for longer than 400us (idle condition).
4. I2C devices do not support the Alert Response Address functionality (which is optional for SMBus).
5. I2C devices support block read and write differently. I2C protocol allows for unlimited number of
bytes to be sent in either direction. The SMBus protocol requires that an additional data byte
indicating number of bytes to read / write is transmitted.
Note: The CAP1214 supports the I2C block read and write only.
4.2
SMBus Protocols
The CAP1214 is SMBus 2.0 compatible and supports Send Byte, Read Byte, Block Read, Receive
Byte as valid protocols as shown below. The CAP1214 also supports the I2C block read and block
write protocols.
All of the below protocols use the convention in Table 4.1.
Table 4.1 Protocol Format
DATA SENT
TO DEVICE
Data sent
SMSC CAP1214
DATA SENT TO
THE HOST
Data sent
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4.2.1
SMBus Write Byte
The Write Byte is used to write one byte of data to a specific register as shown in Table 4.2.
Table 4.2 Write Byte Protocol
START
CLIENT
ADDRESS
WR
ACK
REGISTER
ADDRESS
ACK
REGISTER
DATA
ACK
STOP
1 ->0
0101_000
0
0
XXh
0
XXh
0
0 -> 1
4.2.2
Block Write
The Block Write is used to write multiple data bytes to a group of contiguous registers as shown in
Table 4.3. It is an extension of the Write Byte Protocol.
APPLICATION NOTE: When using the Block Write protocol, the internal address pointer will be automatically
incremented after every data byte is received. It will wrap from FFh to 00h.
Table 4.3 Block Write Protocol
START
CLIENT
ADDRESS
WR
ACK
REGISTER
ADDRESS
ACK
REGISTER
DATA
ACK
1 ->0
0101_000
0
0
XXh
0
XXh
0
REGISTER
DATA
ACK
REGISTER
DATA
ACK
...
REGISTER
DATA
ACK
STOP
XXh
0
XXh
0
...
XXh
0
0 -> 1
4.2.3
SMBus Read Byte
The Read Byte protocol is used to read one byte of data from the registers as shown in Table 4.4.
Table 4.4 Read Byte Protocol
START
1->0
CLIENT
ADDRESS
0101_000
4.2.4
WR
ACK
REGISTER
ADDRESS
ACK
START
CLIENT
ADDRESS
0
0
XXh
0
1 ->0
0101_000
RD
1
ACK
0
REGISTER
DATA
XXh
NACK
1
STOP
0 -> 1
Block Read
The Block Read is used to read multiple data bytes from a group of contiguous registers as shown in
Table 4.5. It is an extension of the Read Byte Protocol.
APPLICATION NOTE: When using the Block Read protocol, the internal address pointer will be automatically
incremented after every data byte is received. It will wrap from FFh to 00h.
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Table 4.5 Block Read Protocol
START
CLIENT
ADDRESS
WR
ACK
REGISTER
ADDRESS
ACK
START
CLIENT
ADDRESS
RD
ACK
REGISTER
DATA
1->0
0101_000
0
0
XXh
0
1 ->0
0101_000
1
0
XXh
ACK
REGISTER
DATA
ACK
REGISTER
DATA
ACK
REGISTER
DATA
ACK
...
REGISTER
DATA
NACK
STOP
0
XXh
0
XXh
0
XXh
0
...
XXh
1
0 -> 1
4.2.5
SMBus Send Byte
The Send Byte protocol is used to set the internal address register pointer to the correct address
location. No data is transferred during the Send Byte protocol as shown in Table 4.6.
Table 4.6 Send Byte Protocol
START
CLIENT
ADDRESS
WR
ACK
REGISTER
ADDRESS
ACK
STOP
1 -> 0
0101_000
0
0
XXh
0
0 -> 1
4.2.6
SMBus Receive Byte
The Receive Byte protocol is used to read data from a register when the internal register address
pointer is known to be at the right location (e.g. set via Send Byte). This is used for consecutive reads
of the same register as shown in Table 4.7.
Table 4.7 Receive Byte Protocol
START
CLIENT
ADDRESS
RD
ACK
REGISTER DATA
NACK
STOP
1 -> 0
0101_000
1
0
XXh
1
0 -> 1
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Chapter 5 Product Description
The CAP1214 is a multiple channel Capacitive Touch sensor and LED Driver.
The CAP1214 has up to 14 individual Capacitive Touch sensor inputs with programmable sensitivity
for use in touch button and slider switch applications. Each sensor input includes automatic
recalibration.
The CAP1214 also has eleven (11) open drain LED drivers that offer full-on / off, variable rate
breathing, and dimness controls. Eight (8) of these LEDs can double as GPIOs and support open-drain
or push-pull operation. Additionally, LEDs 1-7 may be optionally linked to Buttons 1-7 so that when a
touch is detected, the LED is actuated.
The device communicates with a host controller using SMBus. The host controller may poll the device
for updated information at any time or it may configure the device to flag an interrupt whenever a press
is detected on any sensor.
Each sensor input is polled by the device approximately every 35 ms. The host may also initiate a
recalibration routine for one or more sensor inputs or set up times and conditions so that the device
automatically invokes the re-calibration routine.
The CAP1214 contains multiple power states including several low power operating states. In addition,
it contains a user driven RESET pin.
A typical system diagram is shown in Figure 5.1.
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Datasheet
ALERT
Touch
Button
RESET
SMCLK
3.3V
SMDATA
Embedded Controller
VDD
3.3V
FEEDBACK
Touch
Button
CS2
CS7
LED2
LED7
Touch
Button
CAP1214
CS3
CS6
LED3
LED6
Touch
Button
Touch
Button
LED10
CS14
CS13
CS12
CS11
LED5
CS10
LED4
CS9
CS5
CS8
CS4
LED9
3.3V
Transducer
Touch
Button
Touch
Button
3.3V
Dual
Color
LED
LED8
LED1
3.3V
3.3V
LED11
CS1
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
Slider
Figure 5.1 System Diagram for CAP1214
5.1
Power States
The CAP1214 has four operating states depending on the status of the SLEEP, DEACT, and DSLEEP
bits (see Section 6.1). They are described below and summarized in Table 5.1. When the device
transitions between power states, previously detected touches (for deactivated channels) are cleared
and the status bits reset.
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1. Fully Active - The device is monitoring all active Capacitive Sensor channels and driving all LED
channels as defined.
2. Sleep - The device is monitoring a limited number of Capacitive Sensor channels (default 0).
Interrupts will still be generated based on the active channels. The device will still respond to
SMBus commands normally and can be returned to the Fully Active state by clearing the SLEEP
bit. The LED11 channel is controlled via the PWR_LED control (see Section 6.1). All other LEDs
will not be affected.
3. Deep Sleep - The device is not monitoring any Capacitive Sensor channels. The LED11 channel
is controlled via the PWR_LED control (see Section 6.1). All other LEDs will be driven to their
programmed non-actuated state and no PWM operations will be done.
When the device enters the Deep Sleep state, it will release control to the ALERT pin and will
change the direction of the ALERT pin (i.e. the device will monitor the ALERT pin instead of driving
it).
APPLICATION NOTE: When the device enters the Deep Sleep state, the Slider Position / Volumetric Data Register
(06h) is cleared, if the register is set to represent position data.
The device has two methods to exit the Deep Sleep state. They are:
a. The ALERT pin is driven to its active state.
b. Any SMBus communications are directed at the device.
When the device leaves the Deep Sleep state, it automatically returns to its previously defined state
and clears the DSLEEP bit.
4. Inactive - The device is not monitoring any Capacitive Sensor channels. The device will still
respond to SMBus commands normally and can be returned to Fully Active state by clearing the
DEACT bit. All LEDs will have PWM controls suspended so they should be disabled prior to
entering this state. If these LEDs are not disabled, the system will show excess current draw from
these LEDs.
Table 5.1 Power States
POWER STATE
INACTIVE
SLEEP
DSLEEP
Fully Active
0
0
0
Deep Sleep waking to Fully Active
0
0
1
Sleep
0
1
0
Deep Sleep waking to Sleep
0
1
1
Inactive
1
0
0
Deep Sleep waking to Inactive
1
0
1
Inactive
1
1
0
Deep Sleep waking to Inactive
1
1
1
The priority of power control signals is:
1. DSLEEP - when set, will override DEACT and disable all LEDs except LED11.
2. DEACT - when set, will override the SLEEP controls. It will disable sensor measurement and all
LEDs.
3. SLEEP - when set, will enable Sleep state.
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5.2
RESET Pin
The RESET pin is an active high reset that is driven from an external source. The pin contains an
internal delay timer (tRST_FILT) that will block errant glitches on the RESET pin. The RESET pin must
be driven high or low longer than this time before the CAP1214 will react to the pin state.
While the RESET pin is held high, all the internal blocks will be held in reset including the SMBus. All
configuration settings will be reset to default states and all readings will be cleared. Furthermore, the
device will be held in Deep Sleep that can only be removed by driving the RESET pin low.
Once the RESET pin is pulled low, the CAP1214 will begin operation as if a power-on-reset had
occurred. When this happens, the RESET bit will be set and an interrupt will be generated.
5.3
LED Drivers
The CAP1214 contains eleven (11) LED Drivers. Each LED Driver is controlled independently of the
others. LED drivers 1 - 8 can be configured to operate with either push-pull or open-drain drive (see
Section 6.44, "LED / GPIO Output Type Register") and may also be configured to operate as GPIOs
(see Section 6.43, "LED / GPIO Direction Register"). LED drivers 9 - 11 will only operate as open-drain
drivers.
LEDs 1 - 7 and 9 and 10 may be linked to the corresponding Capacitive Touch Sensor input (see
Section 6.50, "Sensor LED Linking Register") so they can be actuated by a touch. When not linked to
sensor inputs, LEDs can be actuated by the host (see Section 6.46, "LED Output Control Registers").
When actuated, the LED drivers operate using one of the following behaviors (see Section 6.51, "LED
Behavior Registers"):
1. Direct - The LED is configured to be on or off when the corresponding input stimulus is on or off
(or inverted). The brightness of the LED can be programmed from full off to full on (default).
Additionally, the LED contains controls to individually configure ramping on, off, and turn-off delay.
2. Pulse 1 - The LED is configured to “Pulse” (transition ON-OFF-ON) a programmable number of
times with programmable rate and min / max brightness. The LED can be configured to be actuated
upon a touch detection (or when hosts sets drive bit) or release detection (or when host clears
drive bit) (see Section 6.52, "LED Pulse 1 Period Register").
3. Pulse 2 - The LED is configured to “Pulse” while actuated and then “Pulse” a programmable
number of times with programmable rate and min / max brightness when the sensor is released.
4. Breathe - The LED is configured to transition ON-OFF-ON (i.e. to “Breathe”) continuously (or with
a programmed off delay) with a programmable rate and min / max brightness.
When an LED is not linked to a sensor and is actuated by the host, there’s an option to assert the
ALERT pin when the LED has completed its behavior (see Section 6.55, "LED Configuration Register").
LED11 operates differently than the other LED outputs in several ways. It is configured to drive up to
two external LED channels simultaneously. It is not automatically disabled during the Sleep or Deep
Sleep states of operation (see Section 6.1, "Main Status Control Register"). It allows for different
behaviors when the device is in Fully Active state versus when the device is in Sleep or Deep Sleep
state. It can drive at a different PWM frequency.
5.3.1
Linking LEDs to Capacitive Touch Sensors
LEDs 1 - 7 can be optionally linked to Capacitive Touch Sensors 1-7 so that when the sensor detects
a button press, the corresponding LED will be actuated at one of the programmed responses.
LEDs 9 and 10 may be optionally linked to the Grouped Sensors to indicate a slide / tap / press and
hold in the “Up” or “Down” directions.
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Datasheet
5.4
Capacitive Touch Sensing
The CAP1214 contains 14 independent Capacitive Touch Sensor inputs. Each sensor input detects a
change of capacitance due to a touch. Additionally, each sensor can be configured to be automatically
and routinely re-calibrated.
5.4.1
Multiple Button Presses
If multiple sensor buttons (with a programmable threshold - see Section 6.23) are simultaneously
detected, only the first N buttons that are detected are flagged. All other buttons are ignored.
Furthermore, the device remembers which buttons were legitimate so new touches are not detected
so long as N buttons are pressed.
Likewise, if too many (based on the programmed threshold - see Section 6.23) grouped sensor
presses are detected, the device will block all press detections on the grouped buttons and cancel any
current presses as if the sensor had been released.
5.4.2
Lid Closure
To detect lid closure or other similar events, lid closure sensor thresholds can be set. A Lid Closure
Event can be flagged based on either a minimum number of sensors or on specific sensors
simultaneously exceeding the lid closure threshold. An interrupt can also be generated. During a Lid
Closure Event, all touches are blocked.
5.4.3
Grouped Sensors (CS8 - CS14)
Capacitive Touch Sensors 8 through 14 may be grouped as a single entity (which is the default state).
Each sensor is sampled independently; however, for purposes of activation, recalibration, and repeat
rates, all of them are treated as one group. The Group also has different controls and allows for
different behavior such as sliding, tapping, or press and hold.
The grouped sensors may be ungrouped as described in Section 5.6.
5.4.4
Sensing Cycle
Each Capacitive Touch Sensor has controls to be activated and included in the sensing cycle. When
the device is active, it automatically initiates a sensing cycle and repeats the cycle every time it
finishes. The cycle polls through each active Sensor starting with CS1 and extending through CS14.
As each Capacitive Touch Sensor is polled, its measurement is compared against a baseline “Not
Touched” measurement. If the delta measurement is large enough, a touch is detected and an interrupt
generated.
5.4.5
Proximity Detection
Sensor CS1 can be configured to detect changes in capacitance due to proximity of a touch. This
circuitry detects the change of capacitance that is generated as an object approaches, but does not
physically touch, the CS1 sensor. When proximity detection is enabled, the signal is boosted by 8x to
detect very small capacitance changes. Separate controls determine averaging and sensitivity for
proximity (see Section 6.35, "Proximity Control Register").
5.4.6
Recalibrating Sensors
Each sensor is regularly recalibrated at a programmable rate. By default, the recalibration routine
stores the average 256 previous measurements and periodically updates the base “Not Touched”
setting for the Capacitive Touch Sensor input. This routine is disabled automatically if a touch is
detected so the touch does not factor into the base “Not Touched” setting.
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5.4.7
Low Frequency Noise Detection
Each sensor has an EMI noise detector that will sense if low frequency noise is injected onto the input
with sufficient power to corrupt the readings. If this occurs, the device will reject the corrupted sample
and set the corresponding bit in the Noise Status registers to a logic ‘1’.
5.4.8
RF Noise Detection
Each sensor also contains an integrated RF noise detector. This block will detect injected RF noise on
the CS pin. The detector threshold is dependent upon the noise frequency. If RF noise is detected on
a CS line, the applicable Noise Status bit is set and that sample is removed and not compared against
the threshold.
5.5
Grouped Sensor Behavior
The CAP1214 Grouped sensors (CS8 - CS14) can be configured to function as a single entity that
operates differently than the individual button sensors (for ungrouped behavior see Section 5.6). When
configured as a group these sensors function as a slider and offer three different interface functions
associated with it. These functions are Tap, Press and Hold, or a Slide.
For purposes of a Tap or Press and Hold event, the “DOWN” side of the Grouped sensors are defined
as CS8, CS9 and CS10. The “UP” side of the Grouped Sensors are defined as CS12, CS13, and
CS14. CS11 is neither “UP” nor “DOWN” and a tap or press and hold event on CS11 will not cause
either UP or DOWN status bits to be set.
For purposes of a slide, the “DOWN” direction is decreasing in CS channel number. Conversely, the
“UP” direction is increasing in CS number.
APPLICATION NOTE: The Grouped Sensors will cause either the UP or DOWN status bits to be set but not both
at the same time. In the case that a sensor on both the “UP” side of the slider and the
“DOWN” side of the slider are touched simultaneously, neither the UP nor DOWN status bits
will be set.
5.5.1
Tap
If a touch on any Grouped sensor is detected and held for less than or equal to the M_PRESS bit
settings (default 245ms), a group press is detected, the TAP bit is set, and an interrupt is generated.
Furthermore, the relative position on the slider is determined and the appropriate UP or DOWN status
bits are set and the appropriate LED is actuated.
No further action is taken. If a slide is subsequently detected, the TAP status bit is cleared.
5.5.2
Press and Hold
If a touch on any Grouped sensor is held for longer than the M_PRESS bit settings (default 245ms),
a Group Touch is detected and an interrupt is generated. Furthermore, the relative position on the
slider is determined and the appropriate UP or DOWN status bits are set, the PH bit is set, and the
appropriate LED is actuated.
So long as the Grouped sensor is held, it will flag an interrupt at the programmed repeat rate (as
determined by the RPT_RATE_PH bit settings) indefinitely. Once the touch has been removed, the
Group is returned to its normal operating condition.
The M_PRESS setting is important to distinguish between Tap, Press & Hold and Sliding. If M_PRESS
is set too low, a Press & Hold may be detected during a slow slide. This will cause user confusion as
the Slide direction and LED may change. Longer M_PRESS settings will ensure that the 3 Group
behaviors are reliably distinct and will add more delay prior to the Press & Hold repeat interrupt
generation.
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5.5.3
Slider
The Grouped sensors have the capability to detect a slide in either the “UP” or “DOWN” direction as
referenced by the sensor numbers that are used. For example, an “Up” direction slide would be
detected if CS8 detected a touch, followed by CS9, then by CS10, etc. Likewise, a “Down” direction
slide would be detected if CS10 detected a touch, followed by CS9, then by CS8, etc.
Slides in either direction are configured to flag an interrupt and to cause an LED to be actuated
(separate for each direction). The Slide is detected independently of a Press and Hold or a Tap
condition and only one condition may be present at any one time.
So long as a slide is maintained in either direction, it will flag an interrupt at the programmed repeat
rate (as determined by the RPT_RATE_SL bit settings). If the slide is removed or changes direction,
it will reset and return to normal operation.
5.5.4
Relative Position
The CAP1214 has the option to indicate the relative position of a touch on the Grouped sensors. This
value is stored either as a scaled number from 2 to 98 indicating where a tap, press and hold, or the
end of a slide was detected or as a 8-bit number that represents volumetric data. When configured to
store volumetric data, the user may write a base setting at any time that is modified based on Grouped
sensor behavior (see Section 6.4).
5.5.5
Slider Velocity
The repeat rate can be dynamically increased based on the speed of a slide. This permits slow sliding
motions to have precise, step-by-step volume control and faster motions to generate increasingly fast
volume changes.
Two techniques are employed to increase the number of interrupts generated based on speed. First,
the slide speed is measured and the repeat rate is increased to provide more interrupts for the same
distance traveled relative to a slower slide. Second, additional interrupts are generated immediately
after the slide ends to further increase the change in volume. The number of additional interrupts is
based on slide speed; both of these dynamic slider behaviors are controlled by the Slider Velocity
Register.
5.6
Ungrouped Sensor Behavior
The CAP1214 Grouped sensors have the option to be used as individual buttons. When the group is
broken (via the VOL_UP_DOWN bit - see Section 6.33), buttons CS8 and CS14 will adopt one type
of behavior while buttons CS9 - CS13 will adopt another. In all cases, a slide will not be detected.
5.6.1
CS9 - CS13 Ungrouped Behavior
These buttons will cause the corresponding status bit in the Button Status 2 register (see Section 6.2)
to be asserted when a touch is detected. This touch detection uses the button queue and button repeat
rate settings. They will use the slider maximum duration and multiple touch settings.
5.6.2
CS8 and CS14 Ungrouped Behavior
CS8 and CS14 will generate interrupts based on the duration of the touch detected, similar to a Tap
and Press and Hold events. Furthermore, these sensors will generate interrupts at the Grouped
Sensors repeat rate based on whether a Tap or Press and Hold event has been detected.
If a touch is detected on CS8, the DOWN status bit will be set in addition to either TAP or PH.
If a touch is detected on CS14, the UP status bit will be set in addition to either TAP or PH.
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Based on the multiple button touch settings (see Section 6.23), both CS8 and CS14 may detect a
touch simultaneously and both UP and DOWN status bits may be set.
5.7
FEEDBACK Pin
The FEEDBACK pin can drive an external device (such as a piezo transducer) to generate feedback
(sound or vibration) to the final application user. The FEEDBACK pin can be driven when a touch is
detected (see Section 6.41, "Feedback Channel Configuration Registers"), or it can be driven by the
host (see Section 6.42, "Feedback One-Shot Register"). Duration and frequency of the output are
programmable (see Section 6.40, "Feedback Configuration Register").
When activated, the FEEDBACK pin drives a 50% duty cycle signal at the programmed frequency for
the programmed duration.
5.8
ALERT Pin
The ALERT pin is an active high output that asserts when an interrupt event is detected. It is also used
to wake the device from Deep Sleep state.
Whenever an interrupt is generated, the INT bit (see Section 6.1) is set. The ALERT pin is cleared
when INT bit is cleared by the user. Additionally, if no press is detected, the status bits are cleared
when the INT bit is cleared.
5.8.1
Button Interrupt Behavior
For non-grouped buttons, an interrupt is generated when a touch is detected. If the repeat rate is
enabled (see Section 6.14), then, so long as the touch is held, another interrupt will be generated
based on the programmed repeat rate (see Figure 5.2) and upon release. If repeat rate is not enabled,
an interrupt is generated when a touch is detected and optionally, can be generated at release (see
Section 6.33 and Figure 5.3).
Interrupt on
Touch
Touch Detected
Polling Cycle
(35ms)
Button Repeat Rate
(175ms)
Button Repeat Rate
(175ms)
Button Repeat Rate
(175ms)
Optional
Interrupt on
Release
ALERT Pin /
INT bit
Button Status
SMBus Write to
INT bit
Figure 5.2 Button Interrupt Behavior - Repeat Rate Enabled
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Revision 1.0 (08-30-10)
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
.
Interrupt on
Touch
Polling Cycle
(35ms)
Optional
Interrupt on
Release
Touch Detected
ALERT Pin /
INT bit
Button Status
SMBus Write to
INT bit
Figure 5.3 Button Interrupt Behavior - No Repeat Rate Enabled
5.8.2
Grouped Sensor Interrupt Behavior
For grouped sensors, an interrupt is generated upon initial detection of a tap, slide, or press and hold
event. Subsequent interrupts are generated as follows:
1. For a slide event, an interrupt is generated based on the programmed repeat rate as well as the
velocity of the slide operation. See Figure 5.6 and Figure 5.7. Additional interrupts are generated
after the slide has finished. These extra interrupts are generated every round robin cycle (~35ms)
and the number is determined by the speed of the slide.
2. For a tap event there are no further interrupts. See Figure 5.4.
3. For a press and hold event, interrupts are generated based on the programmed repeat rate. If the
repeat rate is disabled, no further interrupts are generated. See Figure 5.5.
Polling Cycle
(35ms)
Released before
M_PRESS
Touch Detected
ALERT Pin /
INT bit
M_PRESS
Setting (280ms)
Tap & UP / DOWN
Status
SMBus Write to
INT bit
Figure 5.4 Tap Interrupt Behavior
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SMSC CAP1214
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Polling Cycle
(35ms)
Held longer than
M_PRESS Setting
Touch Detected
ALERT Pin /
INT bit
Repeat Rate
Repeat Rate
(RPT_RATE_PH - 175ms) (RPT_RATE_PH - 175ms)
M_PRESS
Setting (280ms)
PH Status
UP / DOWN Status
SMBus Write to
INT bit
Figure 5.5 Press and Hold Interrupt Behavior
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Polling Cycle
(35ms)
Touch Detected –
CS14
Touch Detected –
CS13
Touch Detected CS12
UP
DOWN
Touch Detected CS11
Touch Detected –
CS10
Touch Detected –
CS9
Touch Detected –
CS8
Repeat Rate
(175ms)
Repeat Rate
(175ms)
ALERT Pin /
INT bit
DOWN Status
UP Status
SMBus Write to
INT bit
Figure 5.6 Slide Interrupt Behavior - No Acceleration
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Polling Cycle
(35ms)
Maximum Slide (768ms)
Touch Detected –
CS14
Touch Detected –
CS13
Touch Detected CS12
Normal Slide – no change
in repeat rate
Touch Detected CS11
Touch Detected –
CS10
Minor Acceleration Repeat Rate reduced
70ms
Touch Detected –
CS9
Slide Ended (525ms) = 0.68 x
Max – Generate 2 extra
interrupts at 35ms apart
Major Acceleration Repeat Rate reduced
35ms
Touch Detected –
CS8
Repeat Rate (base
= 140ms)
140ms
70ms
35ms
ALERT Pin /
INT bit
SMBus Write to
INT bit
Figure 5.7 Slide Interrupt Behavior - Acceleration Example
SMSC CAP1214
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DATASHEET
Revision 1.0 (08-30-10)
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Chapter 6 Register Description
The registers shown in Table 6.1 are accessible through the SMBus. An entry of ‘-’ indicates that the
bit is not used and will always read ‘0’.
Table 6.1 Register Set in Hexadecimal Order
REGISTER
ADDRESS
R/W
REGISTER NAME
FUNCTION
DEFAULT
VALUE
PAGE
00h
R/W
Main Status Control
Controls general power states
00h
Page 41
03h
R
Button Status 1
Returns the state of the Cap
Sensor group and buttons 1 - 6
and slider controls
00h
Page 42
04h
R
Button Status 2
Returns the state of buttons 7 - 14
00h
Page 42
05h
R
Build Revision
Stores the functional revision of
the device build
10h
Page 43
06h
R-C /
R/W
Slider Position /
Volumetric Data
Returns the relative position of a
press on the slider or volumetric
data
00h
Page 44
08h
R
Vendor ID
Stores a fixed value that identifies
SMSC
5Dh
Page 45
09h
R/W
Volumetric Step
Controls the step used for
volumetric data increases for a
slide
01h
Page 45
0Ah
R
Noise Status 1
Stores the noise flags for sensors
1-7
00h
Page 46
0Bh
R
Noise Status 2
Stores the noise flags for sensors
8 - 14
00h
Page 46
0Ch
R
Lid Closure Status 1
Stores lid closure status bits for
sensors 1 - 7
00h
Page 46
0Dh
R
Lid Closure Status 2
Stores lid closure status bits for
sensors 8 - 14
00h
Page 46
0Eh
R-C
GPIO Status
Stores the status of LED1 / GPIO1
through LED8 / GPIO8 pins
00h
Page 47
0Fh
R-C
Group Status
Returns the state of the Grouped
sensors
00h
Page 47
10h
R
Sensor 1 Delta
Count
Stores the delta count for CS1
00h
Page 48
11h
R
Sensor 2 Delta
Count
Stores the delta count for CS2
00h
Page 48
12h
R
Sensor 3 Delta
Count
Stores the delta count for CS3
00h
Page 48
13h
R
Sensor 4 Delta
Count
Stores the delta count for CS4
00h
Page 48
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SMSC CAP1214
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 6.1 Register Set in Hexadecimal Order (continued)
REGISTER
ADDRESS
R/W
REGISTER NAME
FUNCTION
DEFAULT
VALUE
PAGE
14h
R
Sensor 5 Delta
Count
Stores the delta count for CS5
00h
Page 48
15h
R
Sensor 6 Delta
Count
Stores the delta count for CS6
00h
Page 48
16h
R
Sensor 7 Delta
Count
Stores the delta count for CS7
00h
Page 48
17h
R
Sensor 8 Delta
Count
Stores the delta count for CS8
00h
Page 48
18h
R
Sensor 9 Delta
Count
Stores the delta count for CS9
00h
Page 48
19h
R
Sensor 10 Delta
Count
Stores the delta count for CS10
00h
Page 48
1Ah
R
Sensor 11 Delta
Count
Stores the delta count for CS11
00h
Page 48
1Bh
R
Sensor 12 Delta
Count
Stores the delta count for CS12
00h
Page 48
1Ch
R
Sensor 13 Delta
Count
Stores the delta count for CS13
00h
Page 48
1Dh
R
Sensor 14 Delta
Count
Stores the delta count for CS14
00h
Page 48
1Eh
R/W
Queue Control
Controls how samples and noise
flag effects on some data
03h
Page 49
1Fh
R/W
Data Sensitivity
Controls the sensitivity of the
threshold and delta counts and
data scaling of the base counts
2Fh
Page 50
20h
R/W
Configuration
Controls some recalibration and
LED controls
29h
Page 51
21h
R/W
Sensor Enable
Controls whether the Capacitive
Touch Sensor group and button
inputs 1 - 7 are sampled
FFh
Page 52
22h
R/W
Button Configuration
Controls reset delay and autorepeat delay for buttons
A4h
Page 53
23h
R/W
Group Configuration
1
Controls the detection dwell time
before a press is detected within
the group
47h
Page 55
24h
R/W
Group Configuration
2
Controls reset delay and autorepeat delay for grouped sensors
D4h
Page 56
25h
R/W
Calibration Enable
Controls automatic calibration for
grouped sensors and sensors 1 - 7
FFh
Page 57
26h
R/W
Calibration Activate
Activates manual re-calibration for
grouped sensors and sensors 1 - 7
00h
Page 57
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Revision 1.0 (08-30-10)
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 6.1 Register Set in Hexadecimal Order (continued)
REGISTER
ADDRESS
R/W
REGISTER NAME
FUNCTION
DEFAULT
VALUE
PAGE
27h
R/W
Interrupt Enable 1
Enables Interrupts associated with
the grouped sensors and sensors
1-7
FFh
Page 58
28h
R/W
Interrupt Enable 2
Enables Interrupts associated with
GPIOs 1 - 8
00h
Page 58
29h
R/W
Sleep Channel
Control
Determines the number and which
channels are measured during
Sleep
00h
Page 60
2Ah
R/W
Multiple Press
Configuration
Determines the number of
simultaneous presses to flag a
multiple press condition
82h
Page 61
2Bh
R/W
Lid Closure
Configuration
Controls Lid Closure detection and
operation
00h
Page 62
2Ch
R/W
Lid Closure Queue
Control
Controls how many samples must
exceed the lid closure threshold for
Button and Slider operation
02h
Page 62
2Dh
R/W
Lid Closure Pattern 1
Stores pattern bits for lid closure
detection for channels 1 - 7
7Fh
Page 63
2Eh
R/W
Lid Closure Pattern 2
Stores pattern bits for lid closure
detection for channels 8 - 14
7Fh
Page 63
2Fh
R/W
Recalibration
Configuration
Determines re-calibration timing
and sampling window
93h
Page 63
30h
R/W
Sensor 1 Threshold
Stores the delta count threshold to
determine a touch for Capacitive
Touch Sensor 1
40h
Page 65
31h
R/W
Sensor 2 Threshold
Stores the delta count threshold to
determine a touch for Capacitive
Touch Sensor 2
40h
Page 65
32h
R/W
Sensor 3 Threshold
Stores the delta count threshold to
determine a touch for Capacitive
Touch Sensor 3
40h
Page 65
33h
R/W
Sensor 4 Threshold
Stores the delta count threshold to
determine a touch for Capacitive
Touch Sensor 4
40h
Page 65
34h
R/W
Sensor 5 Threshold
Stores the delta count threshold to
determine a touch for Capacitive
Touch Sensor 5
40h
Page 65
35h
R/W
Sensor 6 Threshold
Stores the delta count threshold to
determine a touch for Capacitive
Touch Sensor 6
40h
Page 65
36h
R/W
Sensor 7 Threshold
Stores the delta count threshold to
determine a touch for Capacitive
Touch Sensor 7
40h
Page 65
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SMSC CAP1214
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 6.1 Register Set in Hexadecimal Order (continued)
REGISTER
ADDRESS
R/W
REGISTER NAME
FUNCTION
DEFAULT
VALUE
PAGE
37h
R/W
Group Threshold
Stores the delta count threshold to
determine a touch on any of the
Grouped Sensors
40h
Page 65
38h
R/W
Button Noise
Threshold 1
Stores controls for selecting the
noise threshold for buttons 1 - 4
AAh
Page 66
39h
R/W
Button Noise
Threshold 2
Stores controls for selecting the
noise threshold for buttons 5 - 7
and the Grouped sensors
AAh
Page 66
3Ah
R/W
Lid Closure
Threshold 1
Stores controls for selecting the lid
closure threshold for buttons 1 - 4
AAh
Page 67
3Bh
R/W
Lid Closure
Threshold 2
Stores controls for selecting the lid
closure threshold for buttons 5 - 8
AAh
Page 67
3Ch
R/W
Lid Closure
Threshold 3
Stores controls for selecting the lid
closure threshold for buttons 9 - 12
AAh
Page 67
3Dh
R/W
Lid Closure
Threshold 4
Stores controls for selecting the lid
closure threshold for buttons 13 14
0Ah
Page 67
3Eh
R/W
Slider Velocity
Configuration
Determines speed parameters for
the slider
C5h
Page 68
3Fh
R/W
Digital Recalibration
Forces digital recalibration for all
sensors
00h
Page 70
40h
R/W
Configuration 2
Stores additional controls for
general operation
00h
Page 70
41h
R/W
Grouped Channel
Sensor Enable
Stores controls to enable some or
all sensors in the group
7Fh
Page 72
42h
R/W
Proximity Control
Controls the sensitivity settings for
CS1
02h
Page 73
46h
R/W
Grouped Sensor
Calibration Activate
Stores controls to force a
calibration on the individual
sensors in the Group
00h
Page 57
4Eh
R/W
Sampling Channel
Select
Controls which channels are
affected by the Sampling
Configuration Register settings
00h
Page 74
4Fh
R/W
Sampling
Configuration
Changes the sampling time for one
or more input channels
00h
Page 75
50h
R
Sensor 1 Base Count
Stores the reference count value
for sensor 1
00h
Page 75
51h
R
Sensor 2 Base Count
Stores the reference count value
for sensor 2
00h
Page 75
52h
R
Sensor 3 Base Count
Stores the reference count value
for sensor 3
00h
Page 75
53h
R
Sensor 4 Base Count
Stores the reference count value
for sensor 4
00h
Page 75
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Revision 1.0 (08-30-10)
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 6.1 Register Set in Hexadecimal Order (continued)
REGISTER
ADDRESS
R/W
REGISTER NAME
FUNCTION
DEFAULT
VALUE
PAGE
54h
R
Sensor 5 Base Count
Stores the reference count value
for sensor 5
00h
Page 75
55h
R
Sensor 6 Base Count
Stores the reference count value
for sensor 6
00h
Page 75
56h
R
Sensor 7 Base Count
Stores the reference count value
for sensor 7
00h
Page 75
57h
R
Sensor 8 Base Count
Stores the reference count value
for sensor 8
00h
Page 75
58h
R
Sensor 9 Base Count
Stores the reference count value
for sensor 9
00h
Page 75
59h
R
Sensor 10 Base
Count
Stores the reference count value
for sensor 10
00h
Page 75
5Ah
R
Sensor 11 Base
Count
Stores the reference count value
for sensor 11
00h
Page 75
5Bh
R
Sensor 12 Base
Count
Stores the reference count value
for sensor 12
00h
Page 75
5Ch
R
Sensor 13 Base
Count
Stores the reference count value
for sensor 13
00h
Page 75
5Dh
R
Sensor 14 Base
Count
Stores the reference count value
for sensor 14
00h
Page 75
60h
R
LED Status 1
Stores status bits for LEDs 1 - 8
00h
Page 76
61h
R
LED Status 2
Stores status bits for LEDs 9 - 11
00h
Page 76
62h
R/W
Feedback
Configuration
Controls FEEDBACK pin duration
and frequency
00h
Page 77
63h
R/W
Feedback Channel
Configuration 1
Controls whether sensors 1 - 7 can
assert the FEEDBACK pin
00h
Page 78
64h
R/W
Feedback Channel
Configuration 2
Controls whether sensors 8 - 14
can assert the FEEDBACK pin
00h
Page 78
65h
R/W
Feedback One-Shot
Asserts FEEDBACK pin
00h
Page 79
70h
R/W
LED / GPIO Direction
Controls the direction for LED1/
GPIO1 through LED8 / GPIO8
00h
Page 79
71h
R/W
LED / GPIO Output
Type
Controls the output type for LED1
/ GPIO1 through LED8 / GPIO8
00h
Page 80
72h
R
GPIO Input
Stores the pin state of LED1 /
GPIO1 through LED8 / GPIO8
00h
Page 81
73h
R/W
LED Output Control 1
Controls the output state of the
LED drivers 1 - 8
00h
Page 81
74h
R/W
LED Output Control 2
Controls the output state of the
LED drivers 9 - 11
00h
Page 81
75h
R/W
LED Polarity 1
Controls the output polarity of
LEDs 1 - 8
00h
Page 82
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SMSC CAP1214
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 6.1 Register Set in Hexadecimal Order (continued)
REGISTER
ADDRESS
R/W
REGISTER NAME
FUNCTION
DEFAULT
VALUE
PAGE
76h
R/W
LED Polarity 2
Controls the output polarity of
LEDs 9 - 11
00h
Page 82
77h
R/W
Linked LED
Transition Control 1
Controls transition effects of LEDS
1 - 7 when linked
00h
Page 84
78h
R/W
Linked LED
Transition Control 2
Controls transition effects of LEDS
9 - 10 when linked
00h
Page 84
79h
R/W
LED Mirror Control 1
Controls the duty cycle mirroring of
LEDs 1 - 8
00h
Page 85
7Ah
R/W
LED Mirror Control 2
Controls the duty cycle mirroring of
LEDs 9 - 11
00h
Page 85
80h
R/W
Sensor LED Linking
Controls linking of CS1 - CS7 to
LED channels
00h
Page 86
81h
R/W
LED Behavior 1
Controls the behavior and
response of LEDs 1 - 4
00h
Page 87
82h
R/W
LED Behavior 2
Controls the behavior and
response of LEDs 5 - 8
00h
Page 87
83h
R/W
LED Behavior 3
Controls the behavior and
response of LEDs 9 - 11
00h
Page 87
84h
R/W
LED Pulse 1 Period
Controls the period of each
breathe during a pulse
20h
Page 89
85h
R/W
LED Pulse 2 Period
Controls the period of breath and
pulse release operation
14h
Page 91
86h
R/W
LED Breathe Period
Controls the period of an LED
breathe operation
5Dh
Page 92
88h
R/W
LED Configuration
Controls the number of pulses for
the Pulse 1 and Pulse 2 LED
behaviors
24h
Page 92
8Ah
R/W
LED11 Configuration
Controls LED11 base frequency
and steps
00h
Page 93
90h
R/W
LED Pulse 1 Duty
Cycle
Determines the min and max duty
cycle for the pulse 1 operation
F0h
Page 94
91h
R/W
LED Pulse 2 Duty
Cycle
Determines the min and max duty
cycle for the pulse 2 operation
F0h
Page 94
92h
R/W
LED Breathe Duty
Cycle
Determines the min and max duty
cycle for the breathe operation
F0h
Page 94
93h
R/W
LED Direct Duty
Cycle
Determines the min and max duty
cycle for Direct mode LED
operation
F0h
Page 94
94h
R/W
LED Direct Ramp
Rates
Determines the rising and falling
edge ramp rates of the LED
00h
Page 95
95h
R/W
LED Off Delay
Determines the off delay for some
LED behaviors
00h
Page 96
SMSC CAP1214
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DATASHEET
Revision 1.0 (08-30-10)
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 6.1 Register Set in Hexadecimal Order (continued)
REGISTER
ADDRESS
R/W
REGISTER NAME
FUNCTION
DEFAULT
VALUE
PAGE
B1h
R
Sensor 1 Calibration
Stores the high byte of the 10-bit
value used to drive the analog
portion of sensor 1
00h
Page 99
B2h
R
Sensor 2 Calibration
Stores the high byte of the 10-bit
value used to drive the analog
portion of sensor 2
00h
Page 99
B3h
R
Sensor 3 Calibration
Stores the high byte of the 10-bit
value used to drive the analog
portion of sensor 3
00h
Page 99
B4h
R
Sensor 4 Calibration
Stores the high byte of the 10-bit
value used to drive the analog
portion of sensor 4
00h
Page 99
B5h
R
Sensor 5 Calibration
Stores the high byte of the 10-bit
value used to drive the analog
portion of sensor 5
00h
Page 99
B6h
R
Sensor 6 Calibration
Stores the high byte of the 10-bit
value used to drive the analog
portion of sensor 6
00h
Page 99
B7h
R
Sensor 7 Calibration
Stores the high byte of the 10-bit
value used to drive the analog
portion of sensor 7
00h
Page 99
B8h
R
Sensor 8 Calibration
Stores the high byte of the 10-bit
value used to drive the analog
portion of sensor 8
00h
Page 99
B9h
R
Sensor 9 Calibration
Stores the high byte of the 10-bit
value used to drive the analog
portion of sensor 9
00h
Page 99
BAh
R
Sensor 10
Calibration
Stores the high byte of the 10-bit
value used to drive the analog
portion of sensor 10
00h
Page 99
BBh
R
Sensor 11 Calibration
Stores the high byte of the 10-bit
value used to drive the analog
portion of sensor 11
00h
Page 99
BCh
R
Sensor 12
Calibration
Stores the high byte of the 10-bit
value used to drive the analog
portion of sensor 12
00h
Page 99
BDh
R
Sensor 13
Calibration
Stores the high byte of the 10-bit
value used to drive the analog
portion of sensor 13
00h
Page 99
BEh
R
Sensor 14
Calibration
Stores the high byte of the 10-bit
value used to drive the analog
portion of sensor 14
00h
Page 99
FDh
R
Product ID
Stores a fixed value that identifies
the device
5Ah
Page 100
Revision 1.0 (08-30-10)
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DATASHEET
SMSC CAP1214
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 6.1 Register Set in Hexadecimal Order (continued)
REGISTER
ADDRESS
R/W
REGISTER NAME
FUNCTION
DEFAULT
VALUE
PAGE
FEh
R
Manufacturer ID
Stores a fixed value that identifies
SMSC
5Dh
Page 45
FFh
R
Revision
Stores a fixed value that
represents the revision number
80h
Page 101
During Power-On-Reset (POR), the default values are stored in the registers. A POR is initiated when
power is first applied to the part and the voltage on the VDD supply surpasses the POR level as
specified in the electrical characteristics. Any reads to undefined registers will return 00h. Writes to
undefined registers will not have an effect.
When a bit is “set”, this means that the user writes a logic ‘1’ to it. When a bit is “cleared”, this means
that the user writes a logic ‘0’ to it.
6.1
Main Status Control Register
Table 6.2 Main Status Control Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
00h
R/W
Main Status
Control
-
DEACT
SLEEP
DSLEEP
-
-
PWR_
LED
INT
00h
The Main Status and Control Register controls the primary power state of the device.
Bit 6 - DEACT - Deactivates all sensor scanning and LED activity.
„
‘0’ - (default) - Sensor scanning is active and LEDs are functional.
„
‘1’ - All sensor scanning is disabled and all linked LEDs are disabled (see Section 6.51). The only
way to restart scanning is to clear this bit. The status registers are automatically cleared and the
INT bit is cleared.
Bit 5 - SLEEP - Enables Sleep state by deactivating the LED activity and scanning those sensors
enabled via the Sleep Control register.
„
‘0’ (default) - Sensor scanning is active and LEDs are functional.
„
‘1’ - All LEDs are disabled (except LED11) and the Capacitive Touch Sensor scanning is limited to
the sensors set in the Sleep Channel Control register (see Section 6.22). The status registers will
not be cleared.
Bit 4 - DSLEEP - Enables the Deep Sleep state by deactivating all functions.
„
‘0’ (default) - Sensor scanning is active and LEDs are functional.
„
‘1’ - All sensor scanning is disabled. Except for LED11, all LEDs are driven to their programmed
non-actuated state and no PWM operations will be done. The device will return to its previous
power state when the ALERT pin is driven to its active level (see Section 5.8). The status registers
are automatically cleared and the INT bit is cleared. SMBus communications targeted at the
CAP1214 will bring the device out of deep sleep and automatically clear this bit.
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Bit 1 - PWR_LED - Controls the output of LED11 based on the state of bits 5 and 4.
„
‘0’ (default) - The LED11 output is in the “inactive” or off state. The LED can still be driven by setting
bit 2 LED11_DR in the LED Output Control 2 Register (74h).
„
‘1’ - The LED11 output is active in one of the following conditions:
a. Both bits 4 and 5 are set to a logic ‘0’. The LED will behave as defined by the LED11_CTL
bits (see Section 6.51).
b. Either bit 4 or bit 5 is set to a logic ‘1’. The LED will behave as defined by the LED11_ALT
bits (see Section 6.51).
Bit 0 - INT - Indicates that there is an interrupt. This bit is only set if the ALERT pin has been asserted.
If a channel detects a press and its associated interrupt enable bit is set to a logic ‘0’, no action is
taken.
This bit is cleared by writing a logic ‘0’ to it. When this bit is cleared, the ALERT pin will be deasserted
and all status registers will be cleared if the condition has been removed.
6.2
„
‘0’ - No interrupt pending.
„
‘1’ - A button press has been detected on one or more channels and the interrupt has been
asserted.
Button Status Registers
Table 6.3 Button Status Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
03h
R
Button Status 1
UP
DOWN
CS6
CS5
CS4
CS3
CS2
CS1
00h
04h
R
Button Status 2
CS14
CS13
CS12
CS11
CS10
CS9
CS8
CS7
00h
The Button Status Registers store status bits that indicate a button press has been detected. A value
of ‘0’ in any bit indicates that no button press has been detected. A value of ‘1’ in any bit indicates
that a button press has been detected.
All status bits are cleared when the device enters the Deep Sleep or Inactive states (DSLEEP = ‘1’ or
DEACT = ‘1’ - see Section 6.1). All status bits are cleared when the INT bit is cleared and if a touch
on the respective Capacitive Touch Sensor is no longer present. If a touch is still detected, the bits will
not be cleared (but this will not cause the interrupt to be asserted - see Section 6.14)
APPLICATION NOTE: When the Button Status 1 Register is read, the Group Status register will be automatically
cleared. Therefore, the Group Status register should be read prior to reading the Button
Status Registers
6.2.1
Button Status 1
Bit 7 - UP - Indicates that a slide was detected on increasing sensors (i.e. Sensor 8 -> Sensor 9 ->
Sensor 10). This bit is also set if a press is detected on the “Up” portion of the slider. If the Group
auto-repeat is enabled, the ALERT pin will be periodically asserted while a slide or press and hold
event is still detected. This bit is sticky and will remain set until cleared. Once cleared, it will be re-set
when another interrupt is generated in the “UP” direction. This bit is automatically cleared if the DOWN
bit is set.
Bit 6 - DOWN - Indicates that a slide was detected on decreasing sensors (i.e. Sensor 14 -> Sensor
13-> Sensor 12). This bit is also set if a press is detected on the “Down” portion of the slider. If the
Group auto-repeat is enabled, the ALERT pin will be periodically asserted while a slide or press and
hold event is still detected. This bit is sticky and will remain set until cleared. Once cleared, it will be
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Datasheet
re-set when another interrupt is generated in the “DOWN” direction. This bit is automatically cleared if
the UP bit is set.
Bit 5 - CS6 - Indicates that a press was detected on Sensor 6. This sensor can be linked to LED6.
„
‘0’ - A touch was not detected on the corresponding button.
„
‘1’ - A touch was detected on the corresponding button.
Bit 4 - CS5 - Indicates that a press was detected on Sensor 5. This sensor can be linked to LED5.
Bit 3 - CS4 - Indicates that a press was detected on Sensor 4. This sensor can be linked to LED4.
Bit 2 - CS3 - Indicates that a press was detected on Sensor 3. This sensor can be linked to LED3
Bit 1 - CS2 - Indicates that a press was detected on Sensor 2. This sensor can be linked to LED2.
Bit 0 - CS1 - Indicates that a press was detected on Sensor 1. This sensor can be linked to LED1.
6.2.2
Button Status 2
Bit 7 - CS14 - Indicates that press was detected on Sensor 14. This sensor is part of the group which
can be linked to LED9 and LED10.
Bit 6 - CS13 - Indicates that press was detected on Sensor 13. This sensor is part of the group which
can be linked to LED9 and LED10.
Bit 5 - CS12 - Indicates that press was detected on Sensor 12. This sensor is part of the group which
can be linked to LED9 and LED10.
Bit 4 - CS11 - Indicates that press was detected on Sensor 11. This sensor is part of the group which
can be linked to LED9 and LED10.
Bit 3 - CS10 - Indicates that press was detected on Sensor 10. This sensor is part of the group which
can be linked to LED9 and LED10.
Bit 2 - CS9 - Indicates that press was detected on Sensor 9. This sensor is part of the group which
can be linked to LED9 and LED10.
Bit 1 - CS8 - Indicates that press was detected on Sensor 8. This sensor is part of the group which
can be linked to LED9 and LED10.
Bit 0 - CS7 - Indicates that a press was detected on Sensor 7. This sensor can be linked to LED7.
6.3
Build Revision Register
Table 6.4 Build Revision Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
05h
R
Build Revision
-
-
-
Build4
Build3
Build2
Build1
Build0
10h
The Build Revision Register indicates hardware defined settings that are used.
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Datasheet
6.4
Slider Position / Volumetric Data Register
Table 6.5 Slider Position / Volumetric Data Register
ADDR
R/W
REGISTER
B7
06h
R-C /
R/W
Slider Position /
Volumetric Data
-
B6
B5
B4
B3
POS[6:0]
B2
B1
B0
DEFAULT
00h
The Slider Position / Volumetric Data Register indicates the absolute position of a Tap, Slide, or Press
and Hold event detected on the Grouped sensors (slider). Alternately, the register stores volumetric
data that increases or decreased based on detected operations on the Grouped sensors (slider).
Bits 6-0 - POS[6:0] - Indicate absolute position or volumetric data as determined by the POS_VOL bit
(see Section 6.14).
6.4.1
Absolute Position
The absolute position of a single touch is available from this register. By interpolating information from
up to 3 adjacent buttons, 16 different positions are calculated by the CAP1214 from the center of one
button to the center of each adjacent button. The bits will encode a range from 2 to 98 indicative of
where the touch occurred. Table 6.6 shows an example of the settings assuming a single button is
pressed.
If a slide is detected on the Grouped sensors, the POS[6:0] bits will indicate the most recently touched
sensor (i.e. where the slide ended) however will not indicate where the slide originated.
APPLICATION NOTE: When the device enters the Deep Sleep state, the Slider Position / Volumetric Data Register
(06h) is cleared, if the register is set to represent position data.
APPLICATION NOTE: The register will be cleared to a value of 00h when it is read. It will be set to a valid position
when the next ALERT is generated. It will be updated at the respective repeat rate for a slide
or press and hold event regardless of whether it has been read or not. Therefore, it will only
show the position of the last touch detected at the time of the interrupt.
Table 6.6 Example Slider Absolute Position Decode
Revision 1.0 (08-30-10)
TOUCH POSITION
POS[6:0]
SETTINGS
CS8
02h (2d)
CS9
12h (18d)
CS10
22h (34d)
CS11
32h (50d)
CS12
42h (68d)
CS13
52h (82d)
CS14
62h (98d)
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6.4.2
Volumetric Data
If they are setup to present Volumetric Data (see Section 6.14), the bits will encode a range from 0 to
100. This value is updated based on the Grouped sensor activity:
„
A slide in the “UP” direction will increase the volumetric data by the Volumetric Step setting (see
Section 6.6) whenever an interrupt is generated (including extra interrupts generated after the slide
is complete).
„
A slide in the “DOWN” direction will decrease the volumetric data by the Volumetric Step setting
(see Section 6.6) whenever an interrupt is generated (including extra interrupts generated after the
slide is complete)
„
A tap (see Section 5.5.1) on the “UP” side will increase the volumetric data by a value of 1.
„
A tap on the “DOWN” side will decrease the volumetric data by a value of 1.
„
A press and hold (see Section 5.5.2) on the “UP” side will increase the volumetric data by a value
of 1 at every repeat rate interval.
„
A press and hold (see Section 5.5.2) on the “DOWN” side will decrease the volumetric data by a
value of 1 at every repeat rate interval.
The bits are read / write.
6.5
Vendor ID Register
Table 6.7 Vendor ID Register
ADDR
08h
FEh
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
R
Vendor ID
0
1
0
1
1
1
0
1
5Dh
B2
B1
B0
DEFAULT
The Vendor ID Register stores an 8-bit value that represents SMSC.
6.6
Volumetric Step Register
Table 6.8 Volumetric Step Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
09h
R/W
Volumetric Step
-
-
-
-
B3
VOL_STEP[3:0]
01h
The Volumetric Step Register controls the size of a step to the volumetric data when a slide is detected
in the UP and DOWN directions.
Bits 3 - 0 - VOL_STEP[3:0] - Determines the volumetric data step when a slide is detected. Each LSB
corresponds to a value of ±1.
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Datasheet
6.7
Noise Status Registers
Table 6.9 Noise Status Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
0Ah
R
Noise Status 1
S1_RF_
NOISE
S7_
NOISE
S6_
NOISE
S5_
NOISE
S4_
NOISE
S3_
NOISE
S2_
NOISE
S1_
NOISE
00h
0Bh
R
Noise Status 2
-
S14_
NOISE
S13_
NOISE
S12_
NOISE
S11_
NOISE
S10_
NOISE
S9_
NOISE
S8_
NOISE
00h
The Noise Status Registers store status bits that are generated from the analog block if the detected
noise is above the operating region of the analog detector or the RF noise detector. These bits indicate
that the most recently received data from the sensor is invalid and should not be used for touch
detection. As long as the bit is set for a particular channel, the delta count value is reset to 00h and
thus no touch is detected.
When set, the S1_RF_NOISE (register 0Ah, bit 7) indicates that the CS1 RF noise detector has
detected noise.
These bits are not sticky and will be cleared automatically if the analog block does not report a noise
error.
APPLICATION NOTE: For the CAP1214-2, if the lid closure detection circuitry is enabled, these bits count as
sensors above the lid closure count threshold even if the corresponding data count is not. If
the corresponding data byte exceeds the lid closure threshold, it is not counted twice.
APPLICATION NOTE: Regardless of the state of the Noise Status bits, if low frequency noise is detected on a
sensor, that sample will be discarded unless the DIS_ANA_NOISE bit is set. As well, if RF
noise is detected on a sensor, that sample will be discarded unless the DIS_RF_NOISE bit
is set.
6.8
Lid Closure Status Registers
Table 6.10 Lid Closure Status Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
0Ch
R
Lid Closure
Status 1
-
S7_
LID
S6_
LID
S5_
LID
S4_
LID
S3_
LID
S2_
LID
S1_
LID
00h
0Dh
R
Lid Closure
Status 2
-
S14_
LID
S13_
LID
S12_
LID
S11_
LID
S10_
LID
S9_
LID
S8_
LID
00h
The Lid Closure Status Registers bits are only set if the lid closure detection circuitry is enabled (see
Section 6.24). These status bits indicate that the corresponding Capacitive Touch Sensor exceeded the
Lid Closure threshold. These bits will be set if a button press is detected because the Lid Closure
threshold is a percentage of the Sensor Threshold.
These bits are used in combination with the Lid Closure Pattern register settings to determine when a
Lid Closure Event is flagged (see Section 6.26).
These bits are not sticky and will be cleared automatically when the corresponding sensor count drops
below the lid closure count threshold. The device does not flag a sensor as above or below the
threshold until it has cycled through the queue (see Section 6.25, "Lid Closure Queue Control
Register").
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Datasheet
APPLICATION NOTE: It is likely that recalibration will occur while the lid is closed, resulting in negative delta counts
until recalibration takes place.
6.9
GPIO Status Register
Table 6.11 GPIO Status Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
0Eh
R-C
GPIO Status
GPIO8_
STS
GPIO7_
STS
GPIO6_
STS
GPIO5_
STS
GPIO4_
STS
GPIO3_
STS
GPIO2_
STS
GPIO1_
STS
00h
The GPIO Status Register bits are set whenever one of the GPIO inputs changes states. If the LEDx
/ GPIOx pin is not configured as a GPIO or as an input, the respective bit will be set to a logic ‘0’.
The bits are cleared when the register is read.
6.10
Group Status Register
Table 6.12 Group Status Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
0Fh
R-C
Group Status
LID
MULT
RESET
-
UP
DOWN
TAP
PH
00h
The Group Status Register indicates that one or more actions were detected on the Grouped sensors.
The detectable actions are described in Section 5.5 and Section 5.6.
Bit 7 - LID - Indicates that a Lid Closure Event has been detected. This bit is sticky. When it is set, it
will remain set until read. When a Lid Closure Event is detected, all new touches will be blocked.
Bit 6 - MULT - This bit is asserted if one or more touches are being blocked because greater than N
buttons are simultaneously pressed.
Bit 5 - RESET - Indicates that the device has exited the reset state. This bit may be set via a power
on reset or upon release of the RESET pin. When it is set, it will remain set until read.
Bit 3 - UP - Indicates that a slide was detected on increasing sensors (i.e. Sensor 8 -> Sensor 9 ->
Sensor 10) or on CS14 when the Grouped sensors are ungrouped. This bit is also set if a touch (tap
or press and hold event) is detected on the “Up” portion of the slider. If the Group auto-repeat is
enabled, the ALERT pin will be periodically asserted while a slide or press and hold event is detected.
This bit will be cleared when read and re-set when another interrupt is generated. This bit is cleared
automatically if the DOWN bit is set.
Bit 2 - DOWN - Indicates that a slide was detected on decreasing sensors (i.e. Sensor 14 -> Sensor
13 -> Sensor 12) or on CS8 when the Grouped sensors are ungrouped. This bit is also set if a touch
(tap or press and hold event) is detected on the “Down” portion of the slider. If the Group auto-repeat
is enabled, the ALERT pin will be periodically asserted while a slide or press and hold event is
detected. This bit will be cleared when read and re-set when another interrupt is generated. This bit
is automatically cleared if the UP bit is set.
Bit 1 - TAP - Indicates that a tap was detected on one of the sensors within the Group. The relative
position of the tap is indicated by the UP and DOWN bits so that a tap on the “UP” side of the group
will assert the UP bit as well as the TAP bit. If the tap event is detected in the “center” of the slider
that is neither “UP” nor “DOWN”, the bit will be set; however, no interrupt will be generated. This bit
is sticky and will remain set until read.
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Bit 0 - PH - Indicates that a press and hold event was detected on one of the sensors within the Group.
the relative position of the press is indicated by the UP and DOWN bits so a touch and hold on the
“UP” side of the group will assert the UP bit as well as the PH bit. If the press and hold event is
detected in the “center” of the slider that is neither “UP” nor “DOWN”, the bit will be set; however, no
interrupt will be generated. This bit is sticky and will remain set until read. If the condition is still
present, this bit will be re-set when the interrupt is generated.
6.11
Sensor Delta Count Registers
Table 6.13 Sensor Delta Count Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
10h
R
Sensor 1 Delta
Count
Sign
64
32
16
8
4
2
1
00h
11h
R
Sensor 2 Delta
Count
Sign
64
32
16
8
4
2
1
00h
12h
R
Sensor 3 Delta
Count
Sign
64
32
16
8
4
2
1
00h
13h
R
Sensor 4 Delta
Count
Sign
64
32
16
8
4
2
1
00h
14h
R
Sensor 5 Delta
Count
Sign
64
32
16
8
4
2
1
00h
15h
R
Sensor 6 Delta
Count
Sign
64
32
16
8
4
2
1
00h
16h
R
Sensor 7 Delta
Count
Sign
64
32
16
8
4
2
1
00h
17h
R
Sensor 8 Delta
Count
Sign
64
32
16
8
4
2
1
00h
18h
R
Sensor 9 Delta
Count
Sign
64
32
16
8
4
2
1
00h
19h
R
Sensor 10
Delta Count
Sign
64
32
16
8
4
2
1
00h
1Ah
R
Sensor 11
Delta Count
Sign
64
32
16
8
4
2
1
00h
1Bh
R
Sensor 12
Delta Count
Sign
64
32
16
8
4
2
1
00h
1Ch
R
Sensor 13
Delta Count
Sign
64
32
16
8
4
2
1
00h
1Dh
R
Sensor 14
Delta Count
Sign
64
32
16
8
4
2
1
00h
The Sensor Delta Count Registers store the delta count that is compared against the threshold used
to determine if a touch has been detected. The count value represents a change in input due to the
capacitance associated with a touch on one of the sensors and is referenced to a calibrated base “Not
Touched” count value. The delta is an instantaneous change and is updated once per sensor per
sensing cycle (see Section 5.4.4 - sensor cycle).
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Datasheet
The value presented is a standard 2’s complement number. In addition, the value is capped at a value
of 7Fh. A reading of 7Fh indicates that the sensitivity settings are too high and should be adjusted
accordingly (see Section 6.13).
The value is also capped at a negative value of FFh for negative delta counts which may result upon
a release.
6.12
Queue Control Register
Table 6.14 Queue Control Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
1Eh
R/W
Queue Control
-
-
NO_
CLR_
INTD
NO_
CLR_
NEG
-
B2
B1
B0
DEFAULT
QUEUE_B[2:0]
03h
The Queue Control Register determines the number of consecutive samples for which a single sensor
output is above the Sensor Threshold before a touch is detected. This is also used to determine the
number of consecutive samples used to detect a button release. The queue applies independently to
all channels. This register also determines how the noise status bits affect some data.
Bit 5 - NO_CLR_INTD - Controls whether the accumulation of intermediate data is cleared if the noise
status bit is set.
„
‘0’ (default) - The accumulation of intermediate data is cleared if the noise status bit is set.
„
‘1’ - The accumulation of intermediate data is not cleared if the noise status bit is set.
APPLICATION NOTE: Bits 4 and 5 should both be set to the same value. Either both should be set to ‘0’ or both
should be set to ‘1’.
Bit 4 - NO_CLR_NEG - Controls whether the consecutive negative delta counts counter is cleared if
the noise status bit is set.
„
‘0’ (default) - The consecutive negative delta counts counter is cleared if the noise status bit is set.
„
‘1’ - The consecutive negative delta counts counter is not cleared if the noise status bit is set.
Bits 2 - 0 - QUEUE_B[2:0] - The number of consecutive samples necessary to detect a touch. Default
is 3 consecutive samples. See Table 6.15.
Table 6.15 QUEUE_B Bit Decode
QUEUE_B[2:0]
2
1
0
NUMBER OF CONSECUTIVE
READINGS > THRESHOLD
0
0
0
1
0
0
1
1
0
1
0
2
0
1
1
3 (default)
1
0
0
4
1
0
1
5
1
1
0
6
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Datasheet
Table 6.15 QUEUE_B Bit Decode (continued)
QUEUE_B[2:0]
6.13
2
1
0
NUMBER OF CONSECUTIVE
READINGS > THRESHOLD
1
1
1
7
Data Sensitivity Registers
Table 6.16 Data Sensitivity Register
ADDR
R/W
REGISTER
B7
1Fh
R/W
Data Sensitivity
-
B6
B5
B4
B3
DELTA_SENSE[2:0]
B2
B1
B0
DEFAULT
BASE_SHIFT[3:0]
2Fh
The Data Sensitivity Register controls the sensitivity of all button channels.
Bits 6- 4 DELTA_SENSE[2:0] - Controls the sensitivity of a touch detection. The sensitivity settings act
to scale the relative delta count value higher or lower based on the system parameters. A setting of
000b is the most sensitive while a setting of 111b is the least sensitive (see Table 6.17). At the more
sensitive settings, touches are detected for a smaller delta C corresponding to a “lighter” touch. These
settings are more sensitive to noise and a noisy environment may flag more false touches than less
sensitive levels.
APPLICATION NOTE: A value of 128x is the most sensitive setting available. At the most sensitive settings, the
MSB of the Delta Count register represents 64 out of ~25,000 which corresponds to a touch
of approximately 0.25% of the base capacitance (or a ΔC of 25fF from a 10pF base
capacitance). Conversely, a value of 1x is the least sensitive setting available. At these
settings, the MSB of the Delta Count register corresponds to a delta count of 8192 counts
out of ~25,000 which corresponds to a touch of approximately 33% of the base capacitance
(or a ΔC of 3.33pF from a 10pF base capacitance).
Table 6.17 DELTA_SENSE Bit Decode
DELTA_SENSE[2:0]
2
1
0
SENSITIVITY MULTIPLIER
0
0
0
128x (most sensitive)
0
0
1
64x
0
1
0
32x (default)
0
1
1
16x
1
0
0
8x
1
0
1
4x
1
1
0
2x
1
1
1
1x - (least sensitive)
Bits 3 - 0 - BASE_SHIFT [3:0] - Controls the scaling and data presentation of the Base Count registers.
The higher the value of these bits, the larger the range and the lower the resolution of the data
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Datasheet
presented. The scale factor represents the multiplier to the bit-weighting presented in these register
descriptions. See Table 6.18.
APPLICATION NOTE: The BASE_SHIFT[3:0] bits normally do not need to be updated. These settings will not affect
touch detection or sensitivity. These bits are sometimes helpful in analyzing the Cap Sensing
board performance and stability.
Table 6.18 BASE_SHIFT Bit Decode
BASE_SHIFT[3:0]
3
2
1
0
DATA SCALING
FACTOR
0
0
0
0
1x
0
0
0
1
2x
0
0
1
0
4x
0
0
1
1
8x
0
1
0
0
16x
0
1
0
1
32x
0
1
1
0
64x
0
1
1
1
128x
1
0
0
0
256x
256x
(default = 1111b)
All others
6.14
Configuration Register
Table 6.19 Configuration Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
20h
R/W
Configuration
TIME
OUT
POS_
VOL
DIS_
DIG_
NOISE
DIS_
ANA_
NOISE
MAX_
DUR_
EN_B
RPT_
EN_B
MAX_
DUR_
EN_G
RPT_
EN_G
29h
The Configuration Register controls general global functionality that affects the entire device.
Bit 7 - TIMEOUT - Enables the time-out and idle functionality of the SMBus protocol.
„
‘0’ (default) - The SMBus time-out and idle functionality are disabled. The SMBus interface will not
time out if the clock line is held low. Likewise, it will not reset if both the data and clock lines are
held high for longer than 150us. This is used for I2C compliance.
„
‘1’ - The SMBus time-out and idle functionality are enabled. The SMBus interface will time out if
the clock line is held low for longer than 30ms. Likewise, it will reset if both the data and clock lines
are held high for longer than 150us.
Bit 6 - POS_VOL - Determines the behavior of the POS[6:0] status bits when a Grouped sensor is
activated - see Section 6.4.
„
SMSC CAP1214
‘0’ (default) - The POS[6:0] bits represent position information that indicates which sensor was
touched or the last sensor touched during a slide.
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Datasheet
„
‘1’ - The POS[6:0] bits represent volumetric data. The Position / Volumetric Data register is read /
write.
Bit 5 - DIS_DIG_NOISE - Determines whether the digital noise threshold (see Section 6.29, "Button
Noise Threshold Registers") is used by the device. Setting this bit disables the feature.
„
‘0’ - The digital noise threshold is used. If a delta count value exceeds the noise threshold but does
not exceed the touch threshold, the sample is discarded and not used for the automatic recalibration routine.
„
‘1’ (default) - The noise threshold is disabled. Any delta count that is less than the touch threshold
is used for the automatic re-calibration routine.
Bit 4 - DIS_ANA_NOISE - Determines whether the analog noise filter is enabled. Setting this bit
disables the feature.
„
‘0’ (default) - If low frequency noise is detected by the analog block, the delta count on the
corresponding channel is set to 0. Note that this does not require that Noise Status bits be set.
„
‘1’ - A touch is not blocked even if low frequency noise is detected.
Bit 3 - MAX_DUR_EN_B - Determines whether the maximum duration recalibration is enabled for nongrouped sensors.
„
‘0’ - The maximum duration recalibration functionality is disabled. A press may be held indefinitely
and no re-calibration will be performed on any button.
„
‘1’ (default) - The maximum duration recalibration functionality is enabled. If a press is held for
longer than the MAX_DUR_B bit settings, the re-calibration routine will be restarted (see
Section 6.16).
Bit 2 - RPT_EN_B - Determines whether repeat rate is enabled for all buttons.
„
‘0’ (default) - Repeat rate is not enabled. An interrupt will be generated when a touch is detected.
„
‘1’ - Repeat rate is enabled for all buttons.
Bit 1 - MAX_DUR_EN_G - Determines whether the maximum duration recalibration is enabled for
grouped sensors.
„
‘0’ (default) - The maximum duration recalibration functionality is disabled. A press may be held
indefinitely and no re-calibration will be performed on any button.
„
‘1’ - The maximum duration recalibration functionality is enabled. If a press is held for longer than
the MAX_DUR_G bit settings, the re-calibration routine will be restarted (see Section 6.18).
Bit 0 - RPT_EN_G - Determines the interrupt mechanism used when a Press and Hold event is
detected on a grouped sensor.
6.15
„
‘0’ - An interrupt will be generated when a Press and Hold event is detected.
„
‘1’ (default) - An interrupt will be generated when a Press and Hold event is detected and at the
programmed repeat rate so long as the sensor is pressed.
Sensor Enable Register
Table 6.20 Sensor Enable Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
21h
R/W
Sensor Enable
GP_EN
S7_EN
S6_EN
S5_EN
S4_EN
S3_EN
S2_EN
S1_EN
FFh
The Sensor Enable Register determines whether a Capacitive Touch Sensor input is included in the
sampling cycle in the fully active state. The length of the sampling cycle is not affected by the number
of sensors measured.
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Datasheet
Bit 7 - GP_EN - Enables the Grouped Sensors to be included during the sampling cycle.
„
‘0’ - All sensors in the grouped sensors will not be sampled regardless of the state of the
VOL_UP_DOWN bit.
„
‘1’ (default) - Grouped sensors will be sampled. Individual channels are enabled via the Group
Sampling Enable register.
Bit 6 - S7_EN - Enables the CS7 input to be included during the sampling cycle.
„
‘0’ - The CS7 input is not included in the sampling cycle.
„
‘1’ (default) - The CS7 input is included in the sampling cycle.
Bit 5 - S6_EN - Enables the CS6 input to be included during the sampling cycle.
Bit 4 - S5_EN - Enables the CS5 input to be included during the sampling cycle.
Bit 3 - S4_EN - Enables the CS4 input to be included during the sampling cycle.
Bit 2 - S3_EN - Enables the CS3 input to be included during the sampling cycle.
Bit 1 - S2_EN - Enables the CS2 input to be included during the sampling cycle.
Bit 0 - S1_EN - Enables the CS1 input to be included during the sampling cycle.
6.16
Button Configuration Register
Table 6.21 Button Configuration Register
ADDR
R/W
REGISTER
22h
R/W
Button
Configuration
B7
B6
B5
B4
MAX_DUR_B[3:0]
B3
B2
B1
RPT_RATE_B[3:0]
B0
DEFAULT
A4h
The Button Configuration Register controls timings associated with the Capacitive Sensor channels 1
- 7 that are not Grouped.
Bits 7 - 4 - MAX_DUR_B [3:0] - (default 1010b) - Determines the maximum time that a button is
allowed to be pressed until the Capacitive Touch sensor is recalibrated as shown in Table 6.22.
Bits 3 - 0 - RPT_RATE_B[3:0] - (default 0100b) Determines the time duration between interrupt
assertions when auto repeat is enabled. The resolution is 35ms the range is from 35ms to 560ms as
shown in Table 6.23.
SMSC CAP1214
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 6.22 MAX_DUR_B and MAX_DUR_G Bit Decode
MAX_DUR_B[3:0] AND MAX_DUR_G[3:0]
3
2
1
0
TIME BEFORE
RECALIBRATION
0
0
0
0
560ms
0
0
0
1
840ms
0
0
1
0
1120ms
0
0
1
1
1400ms
0
1
0
0
1680ms
0
1
0
1
2240ms
0
1
1
0
2800ms
0
1
1
1
3360ms
1
0
0
0
3920ms
1
0
0
1
4480ms
1
0
1
0
5600ms
(default for CS1 - CS7)
1
0
1
1
6720ms
1
1
0
0
7840ms
1
1
0
1
8906ms
(default for Grouped Sensors)
1
1
1
0
10080ms
1
1
1
1
11200ms
Table 6.23 RPT_RATE_B / SL / PH Bit Decode
RPT_RATE_B / RPT_RATE_SL / RPT_RATE_PH
3
2
1
0
INTERRUPT REPEAT
RATE
0
0
0
0
35ms
0
0
0
1
70ms
0
0
1
0
105ms
0
0
1
1
140ms
0
1
0
0
175ms
(default)
0
1
0
1
210ms
0
1
1
0
245ms
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 6.23 RPT_RATE_B / SL / PH Bit Decode (continued)
RPT_RATE_B / RPT_RATE_SL / RPT_RATE_PH
3
2
1
0
INTERRUPT REPEAT
RATE
0
1
1
1
280ms
1
0
0
0
315ms
1
0
0
1
350ms
1
0
1
0
385ms
1
0
1
1
420ms
1
1
0
0
455ms
1
1
0
1
490ms
1
1
1
0
525ms
1
1
1
1
560ms
6.17
Group Configuration Register 1
Table 6.24 Group Configuration Register 1
ADDR
R/W
REGISTER
B7
23h
R/W
Group
Configuration 1
B6
B5
B4
B3
RPT_RATE_PH[3:0]
B2
B1
B0
DEFAULT
M_PRESS[3:0]
47h
The Group Configuration 1 Register controls timings associated with the Capacitive Sensor channels
8 - 14 that are included in the group.
Bits 7-4 - RPT_RATE_PH[3:0] - (default 0100b) Determines the time duration between interrupt
assertions when auto repeat is enabled. This setting applies when a press and hold condition is
detected on the on the Grouped Sensors (see Section 5.5). The resolution is 35ms the range is from
35ms to 560ms as shown in Table 6.23.
Bits 3- 0 - M_PRESS[3:0] - (default 0111b) - Determines the minimum amount of time that a sensor
in the Group must detect a button press to differentiate between a tap and a press and hold. If the
sensor detects a touch for longer than the M_PRESS[3:0] settings, a Press and Hold event is detected.
This has no effect on whether a slide is detected within the group. If a slide is detected before or after
the press has been confirmed, it is treated as a separate event. If a sensor detects a touch for less
than or equal to the M_PRESS[3:0] settings, a Tap event is detected.
The resolution is 35ms the range is from 35ms to 560ms as shown in Table 6.25.
Table 6.25 M_PRESS Bit Decode
M_PRESS[3:0]
3
2
1
0
M_PRESS TIME
0
0
0
0
35ms
0
0
0
1
70ms
SMSC CAP1214
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 6.25 M_PRESS Bit Decode (continued)
M_PRESS[3:0]
6.18
3
2
1
0
M_PRESS TIME
0
0
1
0
105ms
0
0
1
1
140ms
0
1
0
0
175ms
0
1
0
1
210ms
0
1
1
0
245ms
0
1
1
1
280ms
(default)
1
0
0
0
315ms
1
0
0
1
350ms
1
0
1
0
385ms
1
0
1
1
420ms
1
1
0
0
455ms
1
1
0
1
490ms
1
1
1
0
525ms
1
1
1
1
560ms
Group Configuration Register 2
Table 6.26 Group Configuration Register 2
ADDR
R/W
REGISTER
24h
R/W
Group
Configuration 2
B7
B6
B5
B4
MAX_DUR_G[3:0]
B3
B2
B1
RPT_RATE_SL[3:0]
B0
DEFAULT
D4h
The Group Configuration 2 Register controls timings associated with the Capacitive Sensor channels
8 - 14 that are included in the group.
Bits 7 - 4 - MAX_DUR_G [3:0] - (default 1101b) - Determines the maximum time that a button is
allowed to be pressed until the Capacitive Touch sensor is recalibrated as shown in Table 6.22.
Bits 3 - 0 - RPT_RATE_SL[3:0] - (default 0100b) Determines the time duration between interrupt
assertions when auto repeat is enabled. This setting applies when a slide is detected on the Grouped
Sensors and acts as the base repeat rate that is adjusted based on the slide speed (see Section 5.5.5).
The resolution is 35ms the range is from 35ms to 560ms as shown in Table 6.23.
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Datasheet
6.19
Calibration Enable Register
Table 6.27 Calibration Enable Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
25h
R/W
Calibration
Enable
G_
CEN
S7_
CEN
S6_
CEN
S5_
CEN
S4_
CEN
S3_
CEN
S2_
CEN
S1_
CEN
FFh
The Calibration Enable Register controls whether the indicated Capacitive Touch Sensor input is
automatically re-calibrated. If a sensor is not enabled, the corresponding calibration enable bit is
ignored.
Bit 7- G_CEN - Enables all sensors in the group to be re-calibrated simultaneously.
„
‘0’ - None of the grouped channels are automatically re-calibrated. They can be re-calibrated
manually by setting the G_CAL bit.
„
‘1’ (default) - All of the grouped channels are automatically re-calibrated as the CAP1214 samples.
Bit 6 - S7_CEN - Enables the CS7 input to be re-calibrated automatically.
„
‘0’ - The CS7 input is not automatically re-calibrated.
„
‘1’ (default) - The CS7 input is automatically re-calibrated as the CAP1214 samples.
Bit 5 - S6_CEN - Enables the CS6 input to be re-calibrated automatically.
Bit 4 - S5_CEN - Enables the CS5 input to be re-calibrated automatically.
Bit 3 - S4_CEN - Enables the CS4 input to be re-calibrated automatically.
Bit 2 - S3_CEN - Enables the CS3 input to be re-calibrated automatically.
Bit 1 - S2_CEN - Enables the CS2 input to be re-calibrated automatically.
Bit 0 - S1_CEN - Enables the CS1 input to be re-calibrated automatically.
6.20
Calibration Activate Registers
Table 6.28 Calibration Activate Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
26h
R/W
Calibration
Activate
G_
CAL
S7_
CAL
S6_
CAL
S5_
CAL
S4_
CAL
S3_
CAL
S2_
CAL
S1_
CAL
00h
R/W
Grouped
Sensor
Calibration
Activate
S14_
CAL
S13_
CAL
S12_
CAL
S11_
CAL
S10_
CAL
S9_
CAL
S8_
CAL
00h
46h
The Calibration Activate Registers force the respective sensors to be re-calibrated. When a bit is set,
the corresponding Capacitive Touch Sensor will be re-calibrated and the bit will be automatically
cleared once the re-calibration routine has finished. This calibration routine will update the internal
analog controls and gain settings followed by a digital calibration to capture the base count for touch
detection. During the re-calibration routine, the sensors will not detect a press for up to 600ms and the
Sensor Base Count register values will be invalid. During this time, any press on the corresponding
sensors will invalidate the re-calibration.
SMSC CAP1214
57
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Revision 1.0 (08-30-10)
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
6.20.1
Calibration Activate - 26h
Bit 7 - G_CAL - When set, all sensors in the group are re-calibrated. This bit is automatically cleared
once all of the sensors in the group have been re-calibrated successfully.
Bit 6 - S7_CAL - When set, the CS7 input is re-calibrated. This bit is automatically cleared once the
sensor has been re-calibrated successfully.
Bit 5 - S6_CAL - When set, the CS6 input is re-calibrated. This bit is automatically cleared once the
sensor has been re-calibrated successfully.
Bit 4 - S5_CAL - When set, the CS5 input is re-calibrated. This bit is automatically cleared once the
sensor has been re-calibrated successfully.
Bit 3 - S4_CAL - When set, the CS4 input is re-calibrated. This bit is automatically cleared once the
sensor has been re-calibrated successfully.
Bit 2 - S3_CAL - When set, the CS3 input is re-calibrated. This bit is automatically cleared once the
sensor has been re-calibrated successfully.
Bit 1 - S2_CAL - When set, the CS2 input is re-calibrated. This bit is automatically cleared once the
sensor has been re-calibrated successfully.
Bit 0 - S1_CAL - When set, the CS1 input is re-calibrated. This bit is automatically cleared once the
sensor has been re-calibrated successfully.
6.20.2
Grouped Sensor Calibration Activate - 46h
Bit 6 - S14_CAL - When set, the CS14 input is re-calibrated. This bit is automatically cleared once the
sensor has been re-calibrated successfully.
Bit 5 - S13_CAL - When set, the CS13 input is re-calibrated. This bit is automatically cleared once the
sensor has been re-calibrated successfully.
Bit 4 - S12_CAL - When set, the CS12 input is re-calibrated. This bit is automatically cleared once the
sensor has been re-calibrated successfully.
Bit 3 - S11_CAL - When set, the CS11 input is re-calibrated. This bit is automatically cleared once the
sensor has been re-calibrated successfully.
Bit 2 - S10_CAL - When set, the CS10 input is re-calibrated. This bit is automatically cleared once the
sensor has been re-calibrated successfully.
Bit 1 - S9_CAL - When set, the CS9 input is re-calibrated. This bit is automatically cleared once the
sensor has been re-calibrated successfully.
Bit 0 - S8_CAL - When set, the CS8 input is re-calibrated. This bit is automatically cleared once the
sensor has been re-calibrated successfully.
6.21
Interrupt Enable Registers
Table 6.29 Interrupt Enable Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
27h
R/W
Interrupt
Enable 1
G_
INT_
EN
S7_
INT_
EN
S6_
INT_
EN
S5_
INT_
EN
S4_
INT_
EN
S3_
INT_
EN
S2_
INT_
EN
S1_
INT_
EN
FFh
28h
R/W
Interrupt
Enable 2
GPIO8_
INT_EN
GPIO7_
INT_EN
GPIO6_
INT_EN
GPIO5_
INT_EN
GPIO4_
INT_EN
GPIO3_
INT_EN
GPIO2_
INT_EN
GPIO1_
INT_EN
00h
Revision 1.0 (08-30-10)
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
The Interrupt Enable Registers determine whether a button press or GPIO input changing state causes
the interrupt pin to be asserted.
6.21.1
Interrupt Enable 1
Bit 7 - G_INT_EN - Enables the interrupt pin to be asserted if a slide, tap, or press and hold action is
detected on the grouped sensors.
„
‘0’ - The interrupt pin will not be asserted if a slide, tap, or press and hold action is detected on
the grouped sensors (associated with the UP, DOWN, TAP, and PH status bits).
„
‘1’ (default) - The interrupt pin will asserted if a slide, tap, or press and hold event is detected on
the grouped sensors (associated with the UP, DOWN, TAP, and PH status bits).
Bit 6 - S7_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS7 (associated
with the CS7 status bit).
„
‘0’ - The interrupt pin will not be asserted if a touch is detected on CS7 (associated with the CS7
status bit).
„
‘1’ (default) - The interrupt pin will be asserted is detected on CS7 (associated with the CS7 status
bit).
Bit 5 - S6_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS6 (associated
with the CS6 status bit).
Bit 4 - S5_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS5 (associated
with the CS5 status bit).
Bit 3 - S4_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS4 (associated
with the CS4 status bit).
Bit 2 - S3_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS3 (associated
with the CS3 status bit).
Bit 1 - S2_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS2 (associated
with the CS2 status bit).
Bit 0 - S1_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS1 (associated
with the CS1 status bit).
6.21.2
Interrupt Enable 2
These bits enable the interrupt pin to be asserted when the GPIOx status bit has been set.
Bit 7 - GPIO8_INT_EN - Enables the interrupt pin to be asserted if the GPIO8 status bit has been set.
„
‘0’ (default) - The interrupt pin will not be asserted if the GPIO8 status bit has been set.
„
‘1’ - The interrupt pin will be asserted if the GPIO8 status bit has been set.
Bit 6 - GPIO7_INT_EN - Enables the interrupt pin to be asserted if the GPIO7 status bit has been set.
Bit 5 - GPIO6_INT_EN - Enables the interrupt pin to be asserted if the GPIO6 status bit has been set.
Bit 4 - GPIO5_INT_EN - Enables the interrupt pin to be asserted if the GPIO5 status bit has been set.
Bit 3 - GPIO4_INT_EN - Enables the interrupt pin to be asserted if the GPIO4 status bit has been set.
Bit 2 - GPIO3_INT_EN - Enables the interrupt pin to be asserted if the GPIO3 status bit has been set.
Bit 1 - GPIO2_INT_EN - Enables the interrupt pin to be asserted if the GPIO2 status bit has been set.
Bit 0 - GPIO1_INT_EN - Enables the interrupt pin to be asserted if the GPIO1 status bit has been set.
SMSC CAP1214
59
DATASHEET
Revision 1.0 (08-30-10)
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
6.22
Sleep Channel Control Register
Table 6.30 Sleep Channel Control Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
29h
R/W
Sleep Channel
Control
GR_
SLEEP
S7_
SLEEP
S6_
SLEEP
S5_
SLEEP
S4_
SLEEP
S3_
SLEEP
S2_
SLEEP
S1_
SLEEP
00h
The Sleep Channel Control Register determines which sensors are sampled when the device is placed
into the Sleep state.
APPLICATION NOTE: If this register is updated while the device is in the Sleep state, the conversion cycle may be
extended or for the first measurement of the new Capacitive Touch Sensors. It will correct
itself on subsequent measurement cycles.
APPLICATION NOTE: If this register is updated while the device is in the Sleep state, it is recommended to force
a recalibration routine on newly activated channels.
Bit 7 - GR_SLEEP - Enables the Grouped sensors to be sampled when the device is placed into the
Sleep state.
„
‘0’ (default) - Grouped Sensors are not sampled when the device is in the Sleep state.
„
‘1’ - The Grouped Sensors are sampled when the device is in Sleep mode. If a tap, slide, or touch
and hold is detected, the appropriate status bit is set and an interrupt generated. Individual sensors
will be enabled via the Group Sensor Enable register.
Bit 6 - S7_SLEEP - Enables the CS7 sensor to be sampled when the device is placed into sleep mode.
„
‘0’ (default) - The CS7 input is not sampled when the device is in the Sleep state
„
‘1’ - The CS7 input is sampled when the device is in Sleep mode. If a touch is detected, the status
bit is set and an interrupt generated.
Bit 5 - S6_SLEEP - Enables the CS6 sensor to be sampled when the device is placed into the Sleep
state.
Bit 4 - S5_SLEEP - Enables the CS5 sensor to be sampled when the device is placed into the Sleep
state.
Bit 3 - S4_SLEEP - Enables the CS4 sensor to be sampled when the device is placed into the Sleep
state.
Bit 2 - S3_SLEEP - Enables the CS3 sensor to be sampled when the device is placed into the Sleep
state.
Bit 1 - S2_SLEEP - Enables the CS2 sensor to be sampled when the device is placed into the Sleep
state.
Bit 0 - S1_SLEEP - Enables the CS1 sensor to be sampled when the device is placed into the Sleep
state.
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
6.23
Multiple Touch Configuration Register
Table 6.31 Multiple Touch Configuration Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
2Ah
R/W
Multiple
Touch Config
MULT_
BLK_EN
-
-
-
B3
B2
B_MULT_T[1:0]
B1
B0
G_MULT_T[1:0]
DEFAULT
82h
The Multiple Touch Configuration Register controls the settings for the multiple touch detection circuitry.
These settings determine the number of sensors associated with this detection and the CAP1214
device behavior.
Bit 7 - MULT_BLK_EN - Enables the multiple button blocking circuitry.
„
‘0’ - The multiple touch circuitry is disabled. The device will not block multiple touches.
„
‘1’ (default) - The multiple touch circuitry is enabled. The device will accept the number of touches
equal to programmed multiple touch threshold and block all others. It will remember which sensor
is valid and block all others until that sensor has been released.
Bits 3 - 2 - B_MULT_T[1:0] - Determines the number of simultaneous touches on all buttons (excluding
the Grouped buttons) before a Multiple Touch Event is flagged. If the number of multiple buttons
touches is greater than the threshold value, a Multiple Touch Event is flagged. The bit decode is given
by Table 6.32.
Table 6.32 B_MULT_T Bit Decode
B_MULT_T[1:0]
1
0
NUMBER OF SIMULTANEOUS
TOUCHES
0
0
1 (default)
0
1
2
1
0
3
1
1
4
Bits 1 - 0 - G_MULT_T[1:0] - Determines the number of simultaneous touches on all Grouped buttons
before a Multiple Touch Event is flagged. If the number of multiple buttons touches is greater than the
threshold value, a Multiple Touch Event is flagged. The bit decode is given by Table 6.33.
Table 6.33 G_MULT_T Bit Decode
G_MULT_T[1:0]
SMSC CAP1214
1
0
NUMBER OF SIMULTANEOUS
TOUCHES
0
0
2
0
1
3
1
0
4 (default)
1
1
1
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Revision 1.0 (08-30-10)
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
6.24
Lid Closure Configuration Register
Table 6.34 Lid Closure Configuration Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
2Bh
R/W
Lid Closure
Config
LID_
CLOSE
-
-
-
-
-
COMP_
PTRN
LID_
ALRT
00h
The Lid Closure Configuration Register controls the settings for the lid closure detection circuitry.
Bit 7 - LID_CLOSE - Enables the lid closure circuitry.
„
‘0’ (default) - The lid closure circuitry is disabled.
„
‘1’ The lid closure circuitry is enabled. The device will use the Lid Closure Status registers in
combination with the Lid Closure Pattern register settings to determine when a Lid Closure Event
is flagged. In addition, the Noise Status bits are associated with lid closure.
Bit 1 - COMP_PTRN - Determines how the Lid Closure Status registers are compared against the Lid
Closure Pattern registers. See Section 6.26 for details on how the Lid Closure Pattern registers are
used.
„
‘0’ (default) - The Lid Closure Status registers are not compared directly against the Lid Closure
Pattern registers. Instead, the number of bits in the Lid Closure Status registers is compared to the
number of bits in the Lid Closure Pattern registers to determine whether a Lid Closure Event is
flagged.
„
‘1’ - The Lid Closure Status registers are compared directly against the Lid Closure Pattern
registers. If the bits set in the Lid Closure Pattern are also set in the Lid Status registers, a Lid
Closure Event is flagged.
Bit 0 - LID_ALRT - Enables an interrupt if a Lid Closure Event occurs.
6.25
„
‘0’ (default) - If a Lid Closure Event occurs, the ALERT pin is not asserted.
„
‘1’ - If a Lid Closure Event occurs, the ALERT pin will be asserted.
Lid Closure Queue Control Register
Table 6.35 Lid Closure Queue Control Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
2Ch
R/W
Lid Closure
Queue Control
-
-
-
-
-
B2
B1
B0
QUEUE_L[2:0]
DEFAULT
02h
The Lid Closure Queue Control Register determines the number of consecutive samples for which a
single sensor output is above the Lid Closure Threshold before it is flagged.
A value of 0000b is decoded as 1.
Bits 2 - 0 - QUEUE_L[2:0] - The number of consecutive samples from an individual sensor necessary
to set the Lid Closure status bit associated with the sensor. The queue applies individually to all
sensors (including both buttons and grouped sensors) and applies to setting and clearing the
respective status bit. The queue can range from 1 sample to 8 consecutive samples with a default of
2 consecutive samples.
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
6.26
Lid Closure Pattern Registers
Table 6.36 Lid Closure Pattern Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
2Dh
R/W
Lid Closure
Pattern 1
-
S7_LM
S6_LM
S5_LM
S4_LM
S3_LM
S2_LM
S1_LM
7Fh
2Eh
R/W
Lid Closure
Pattern 2
S14_
LM
S13_
LM
S12_
LM
S11_
LM
S10_
LM
S9_LM
S8_LM
7Fh
The Lid Closure Pattern Registers act as a pattern to identify an expected sensor profile that is
consistent with lid closure. They are only used when lid closure is enabled (see Section 6.24, "Lid
Closure Configuration Register"). There are two methods for how the Lid Closure Status Registers are
used with the Lid Closure Pattern registers: as specific sensors that must exceed the lid closure
threshold or as the number of sensors that must exceed the lid closure threshold. Which method is
used is based on bit 1 in the Lid Closure Configuration Register. The methods are described below. A
Lid Closure Event is flagged in the Group Status register (see Section 6.10, "Group Status Register").
1. Specific Sensors: If the bits set in the Lid Closure Pattern are also set in the Lid Status registers,
a Lid Closure Event is flagged.
2. Number of Sensors: The number of bits in the Lid Closure Status registers is compared to the
number of bits in the Lid Closure Pattern registers to determine whether a Lid Closure Event is
flagged. If any one of the conditions below is met, the Lid Closure Event is flagged.
6.27
„
If the number of bits in Lid Closure Status 1 register equals or exceeds the number of bits in
the Lid Closure Pattern 1 register, a Lid Closure Event is flagged. In other words, if the number
of simultaneous sensors 1-7 exceeding the lid closure threshold meets or exceeds the number
of bits in the Lid Closure Pattern 1 register, a Lid Closure Event is flagged.
„
If the number of bits in Lid Closure Status 2 register equals or exceeds the number of bits in
the Lid Closure Pattern 2 register, a Lid Closure Event is flagged. In other words, if the number
of simultaneous grouped sensors 8-14 exceeding the lid closure threshold meets or exceeds
the number of bits in the Lid Closure Pattern 2 register, a Lid Closure Event is flagged.
„
If the total number of bits in both the Lid Closure Status 1 and 2 registers equals or exceeds
the total number of bits in both the Lid Closure Pattern 1 and 2 registers, a Lid Closure Event
is flagged. In other words, if the total number of sensors above the lid closure threshold is
greater than or equal to the number of sensors required for both Lid Closure Patterns, a Lid
Closure Event is flagged.
„
A value of 00h in both registers will effectively disable the Lid Closure circuitry and clear the
LID status bit.
Recalibration Configuration Register
Table 6.37 Recalibration Configuration Register
ADDR
R/W
REGISTER
B7
B6
B5
2Fh
R/W
Recalibration
Configuration
BUT_
LD_TH
GP_
LD_TH
-
B4
B3
NEG_DELTA_
CNT[1:0]
B2
B1
CAL_CFG[2:0]
B0
DEFAULT
93h
The Recalibration Configuration Register controls the automatic re-calibration routine settings as well
as advanced controls to program the Sensor Threshold register settings and interrupt behavior.
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Bit 7 - BUT_LD_TH - Enables setting all button Sensor Threshold registers by writing to the Sensor 1
Threshold register.
„
‘0’ - Each Sensor X Threshold register is updated individually.
„
‘1’ (default) - Writing the Sensor 1 Threshold register will automatically overwrite the Sensor
Threshold registers for all buttons (Sensor Threshold 1 through Sensor Threshold 7). The individual
Sensor X Threshold registers (Sensor 2 Threshold through Sensor 7 Threshold) can be individually
updated at any time.
Bit 6 - GP_LD_TH - Enables setting the Group Threshold register by writing to the Sensor 1 Threshold
register.
„
‘0’ (default) - The Group Threshold register is updated independently of the Sensor 1 Threshold
register.
„
‘1’ - Writing the Sensor 1 Threshold register automatically overwrites the Group Threshold register
settings.
Bits 4 - 3 - NEG_DELTA_CNT[1:0] - Determines the number of negative delta counts necessary to
trigger a digital re-calibration as shown in Table 6.38.
Table 6.38 NEG_DELTA_CNT Bit Decode
NEG_DELTA_CNT[1:0]
1
0
NUMBER OF CONSECUTIVE NEGATIVE DELTA
COUNT VALUES
0
0
8
0
1
16
1
0
32 (default)
1
1
None (disabled)
Bits 2 - 0 - CAL_CFG[2:0] - Determines the update time and number of samples of the automatic recalibration routine. The settings apply to all sensors universally (though individual sensors and the
group can be configured to support re-calibration - see Section 6.19).
Table 6.39 CAL_CFG Bit Decode
CAL_CFG[2:0]
2
1
0
RECALIBRATION
SAMPLES (SEE
Note 6.1)
0
0
0
16
16
0
0
1
32
32
0
1
0
64
64
0
1
1
256
256 (default)
1
0
0
256
1024
1
0
1
256
2048
1
1
0
256
4096
1
1
1
256
7936
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64
DATASHEET
UPDATE TIME (SEE
Note 6.2)
SMSC CAP1214
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
6.28
Note 6.1
Recalibration Samples refers to the number of samples that are measured and averaged
before the Base Count is updated.
Note 6.2
Update Time refers to the amount of time (in polling cycle periods) that elapses before the
Base Count is updated.
Sensor Threshold Registers
Table 6.40 Sensor Threshold Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
30h
R/W
Sensor 1
Threshold
-
64
32
16
8
4
2
1
40h
31h
R/W
Sensor 2
Threshold
-
64
32
16
8
4
2
1
40h
32h
R/W
Sensor 3
Threshold
-
64
32
16
8
4
2
1
40h
33h
R/W
Sensor 4
Threshold
-
64
32
16
8
4
2
1
40h
34h
R/W
Sensor 5
Threshold
-
64
32
16
8
4
2
1
40h
35h
R/W
Sensor 6
Threshold
-
64
32
16
8
4
2
1
40h
36h
R/W
Sensor 7
Threshold
-
64
32
16
8
4
2
1
40h
37h
R/W
Group
Threshold
-
64
32
16
8
4
2
1
40h
The Sensor Threshold Registers store the delta threshold that is used to determine if a touch has been
detected. When a touch occurs, the input signal of the corresponding sensor changes due to the
capacitance associated with a touch. If the sensor input change exceeds the threshold settings, a
touch is detected.
When the BUT_LD_TH bit is set (see Section 6.27 - bit 7), writing data to the Sensor 1 Threshold
register will update all of the button threshold registers (31h - 36h inclusive).
When the GP_LD_TH bit is set (see Section 6.27 - bit 6), writing data to the Sensor 1 Threshold
register (30h) will update the Group Threshold register (37h).
Individual button registers and the Group Threshold register may be updated independently of the
Sensor 1 Threshold settings.
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DATASHEET
Revision 1.0 (08-30-10)
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
6.29
Button Noise Threshold Registers
Table 6.41 Button Noise Threshold Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
38h
R/W
Button Noise
Threshold 1
CS4_BN_TH
[1:0]
CS3_BN_TH
[1:0]
CS2_BN_TH
[1:0]
CS1_BN_TH
[1:0]
AAh
39h
R/W
Button Noise
Threshold 2
GR_BN_TH
[1:0]
CS7_BN_TH
[1:0]
CS6_BN_TH
[1:0]
CS5_BN_TH
[1:0]
AAh
The Button Noise Threshold Registers control the value of a secondary internal threshold to detect
noise and improve the automatic recalibration routine. If a Capacitive Touch Sensor output exceeds
the Button Noise Threshold but does not exceed the sensor threshold, it is determined to be caused
by a noise spike. That sample is not used by the automatic re-calibration routine.
This feature can be disabled by setting the DIS_DIG_NOISE bit (see Section 6.14, "Configuration
Register").
The Button Noise Threshold is proportional to the programmed threshold as shown in Table 6.42.
Table 6.42 CSx_BN_TH Bit Decode
CSX_BN_TH[1:0]
6.29.1
1
0
THRESHOLD DIVIDE SETTING
0
0
6.25%
0
1
12.5%
1
0
25% (default)
1
1
50%
Button Noise Threshold 1 Register
The Button Noise Threshold 1 Register controls the noise threshold for Capacitive Touch Sensors 1-4.
Bits 7-6 - CH4_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 4.
Bits 5-4 - CH3_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 3.
Bits 3-2 - CH2_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 2.
Bits 1-0 - CH1_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 1.
6.29.2
Button Noise Threshold 2 Register
The Button Noise Threshold 2 Register controls the noise threshold for Capacitive Touch Sensors 5 7 and the Grouped sensors.
Bits 7-6 - GR_BN_TH[1:0] - Controls the noise threshold for all grouped Capacitive Touch Sensors.
Bits 5-4 - CH7_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 7.
Bits 3-2 - CH6_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 6.
Bits 1-0 - CH5_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 5.
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
6.30
Lid Closure Threshold Registers
Table 6.43 Lid Closure Threshold Registers
ADDR
R/W
REGISTER
B7
B6
3Ah
R/W
Lid Closure
Threshold 1
CS4_LD_TH
[1:0]
CS3_LD_TH
[1:0]
CS2_LD_TH
[1:0]
CS1_LD_TH
[1:0]
AAh
3Bh
R/W
Lid Closure
Threshold 2
CS8_LD_TH
[1:0]
CS7_LD_TH
[1:0]
CS6_LD_TH
[1:0]
CS5_LD_TH
[1:0]
AAh
3Ch
R/W
Lid Closure
Threshold 3
CS12_LD_TH
[1:0]
CS11_LD_TH
[1:0]
CS10_LD_TH
[1:0]
CS9_LD_TH
[1:0]
AAh
3Dh
R/W
Lid Closure
Threshold 4
CS14_LD_TH
[1:0]
CS13_LD_TH
[1:0]
0Ah
-
B5
-
B4
-
-
B3
B2
B1
B0
DEFAULT
The Lid Closure Threshold Registers control the value of a secondary internal threshold to detect noise
potentially generated by lid closure. If a Capacitive Touch Sensor output exceeds the Lid Closure
Threshold, the appropriate status bit is set in the Lid Closure Status register (see Section 6.8).
The Lid Closure Threshold is proportional to the programmed Sensor Threshold as shown in
Table 6.44.
Table 6.44 CSx_LD_TH Bit Decode
CSX_LD_TH[1:0]
6.30.1
1
0
THRESHOLD DIVIDE SETTING
0
0
6.25%
0
1
12.5%
1
0
25% (default)
1
1
50%
Lid Closure Threshold 1 Register
The Lid Closure Threshold 1 Register controls the lid closure threshold for Capacitive Touch Sensors
1-4.
Bits 7-6 - CS4_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 4.
Bits 5-4 - CS3_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 3.
Bits 3-2 - CS2_LD_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 2.
Bits 1-0 - CS1_LD_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 1.
6.30.2
Lid Closure Threshold 2 Register
The Lid Closure Threshold 2 Register controls the lid closure threshold for Capacitive Touch Sensors
5 - 8.
Bits 7-6 - CS8_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 8 (one of
the grouped sensors).
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Bits 5-4 - CS7_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 7.
Bits 3-2 - CS6_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 6.
Bits 1-0 - CS5_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 5.
6.30.3
Lid Closure Threshold 3 Register
The Lid Closure Threshold 3 Register controls the lid closure threshold for Capacitive Touch Sensors
9 - 12.
Bits 7-6 - CS12_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 12 (one
of the grouped sensors).
Bits 5-4 - CS11_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 11 (one
of the grouped sensors).
Bits 3-2 - CS10_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 10 (one
of the grouped sensors).
Bits 1-0 - CS9_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 9 (one of
the grouped sensors).
6.30.4
Lid Closure Threshold 4 Register
The Lid Closure Threshold 4 Register controls the lid closure threshold for Capacitive Touch Sensors
13 - 14.
Bits 3-2 - CS14_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 14 (one
of the grouped sensors).
Bits 1-0 - CS13_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 13 (one
of the grouped sensors).
6.31
Slider Velocity Configuration Register
Table 6.45 Slider Velocity Configuration Register
ADDR
R/W
REGISTER
B7
3Eh
R/W
Slider Velocity
Configuration
ACC_
INT_EN
B6
B5
MAX_INT[2:0]
B4
B3
B2
SLIDE_TIME
[1:0]
B1
B0
RPT_SCALE
[1:0]
DEFAULT
C5h
The Slider Velocity Configuration Register controls the speed sensitive behaviors of the slider, allowing
the number of interrupts to be increased as the slide speed increases.
Bit 7 - ACC_INT_EN - Enables the device to generate extra interrupts after an accelerated slide has
been detected.
„
‘0’ - The device will not generate extra interrupts during or after the slide has been detected.
„
‘1’ (default) - The device will generate extra interrupts after an accelerated slide is detected. The
number of extra interrupts generated will be proportional to the speed of the accelerated slide but
will not exceed the maximum number of extra interrupts as determined by the MAX_INT bits.
Bits 6-4 - MAX_INT[2:0] - (default 100b) Determine the maximum number of extra interrupts that will
be generated after a single slide (regardless of length). The variable “T” is the actual slide time and
the parameter SLIDE_TIME is set by bits [3:2] of this register.
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SMSC CAP1214
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 6.46 MAX_INT Bit Decode
MAX_INT[2:0]
# INTERRUPTS
FOR 1/2 < T <
3/4 SLIDE_TIME
# INTERRUPTS
FOR 3/4 < T <
FULL
SLIDE_TIME
2
1
0
MAX #
INTERRUPTS
# INTERRUPTS
FOR T < 1/2
SLIDE_TIME
0
0
0
0
0
0
0
0
0
1
1
1
0
0
0
1
0
2
2
1
0
0
1
1
3
3
1
0
1
0
0
4
4
2
1
1
0
1
5
5
2
1
1
1
0
6
6
3
1
1
1
1
7
7
3
1
Bits 3-2 - SLIDE_TIME[1:0] - (default 01b) - Determines how fast a slide must be to generate extra
interrupts. This is the maximum slide time that will result in extra interrupts being generated. If the slide
time is greater than SLIDE_TIME, no extra interrupts will be generated.
Table 6.47 SLIDE_TIME Bit Decode
SLIDE_TIME[1:0]
1
0
APPROXIMATE SLIDE TIME (MSEC)
0
0
350
0
1
560 (default)
1
0
770
1
1
980
Bits 1 - 0 - RPT_SCALE[1:0] - (default 01b) - Determines how much to increase the Repeat Rate
based on slide speed. The slide speed is determined by counting how many sensors are touched in
approximately 100msec. The Repeat Rate is then increased various amounts based on the
RPT_SCALE parameter.
When read in Table 6.48, the repeat rate given is the number of measurement cycles between
interrupts generated.
Table 6.48 RPT_SCALE Bit Decode
REPEAT RATE (MSEC)
RPT_SCALE[1:0]
NUMBER OF SENSORS IN
100MSEC
00
01
10
11
>=5
35
35
35
35
4
35
35
35
70
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DATASHEET
Revision 1.0 (08-30-10)
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 6.48 RPT_SCALE Bit Decode (continued)
REPEAT RATE (MSEC)
RPT_SCALE[1:0]
NUMBER OF SENSORS IN
100MSEC
00
01
10
11
3
35
35
70
105
2
35
70
105
140
1
RPT_RATE_SL
Note 6.3
6.32
If the repeat rate for the slider is set at 105msec or lower, the 11b case will use the fixed
values of 140, 105 and 70msec, respectively.
Digital Recalibration Control Register
Table 6.49 Digital Recalibration Control Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
3Fh
R/W
Digital
Recalibration
Control
GP_
D_CAL
CS7_
D_CAL
CS6_
D_CAL
CS5_
D_CAL
CS4_
D_CAL
CS3_
D_CAL
CS2_
D_CAL
CS1_
D_CAL
00h
The Digital Recalibration Control Register forces channels to perform a digital calibration as if there
were no base count. When a bit is set, the corresponding Capacitive Touch Sensor will be re-calibrated
and the bit will be automatically cleared once the re-calibration routine has finished. This calibration
routine will update the base count for touch detection.
Bit 7 - GP_D_CAL - Forces the grouped sensors to perform a digital recalibration as if there were no
base count.
Bit 6 - CS7_D_CAL - Forces CS7 to perform a digital recalibration as if there were no base count.
Bit 5 - CS6_D_CAL - Forces CS6 to perform a digital recalibration as if there were no base count.
Bit 4 - CS5_D_CAL - Forces CS5 to perform a digital recalibration as if there were no base count.
Bit 3 - CS4_D_CAL - Forces CS4 to perform a digital recalibration as if there were no base count.
Bit 2 - CS3_D_CAL - Forces CS3 to perform a digital recalibration as if there were no base count.
Bit 1 - CS2_D_CAL - Forces CS2 to perform a digital recalibration as if there were no base count.
Bit 1 - CS1_D_CAL - Forces CS1 to perform a digital recalibration as if there were no base count.
6.33
Configuration 2 Register
Table 6.50 Configuration 2 Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
40h
R/W
Configuration
2
INV_LINK_
TRAN
-
LED11_
CFG
BLK_
POL_
MIR
SHOW_
RF_
NOISE
DIS_
RF_
NOISE
VOL_
UP_
DOWN
INT_
REL_n
00h
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DATASHEET
SMSC CAP1214
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Bit 7 - INV_LINK_TRAN - Determines the behavior of the Linked LED Transition controls (see Section
6.48, "Linked LED Transition Control Registers").
„
‘0’ (default) - The Linked LED Transition controls set the min duty cycle equal to the max duty cycle.
„
‘1’ - The Linked LED Transition controls will invert the touch signal. For example, a touch signal
will be inverted to a non-touched signal.
Bit 5 - LED11_CFG - Determines whether LED11 base frequency is configurable.
„
‘0’ (default) - The PWM base frequency for the LED11 driver is set at ~2000Hz.
„
‘1’ - The PWM base frequency for the LED11 driver will be configured per settings in the LED11
Configuration Register (8Ah) (see Section 6.56, "LED11 Configuration Register").
Bit 4 - BLK_POL_MIR - Determines whether the LED Mirror Control register bits are linked to the LED
Polarity bits.
„
‘0’ (default) - When the LED Polarity controls are set, the corresponding LED Mirror control is
automatically set. Likewise, when the LED Polarity controls are cleared, the corresponding LED
Mirror control is cleared.
„
‘1’ - When the LED Polarity controls are changed, the corresponding LED Mirror control is not
automatically changed.
Bit 3 - SHOW_RF_NOISE - Determines whether the Noise Status bits will show RF Noise as the only
input source.
„
‘0’ (default) - The Noise Status registers will show both RF noise and low frequency noise if either
is detected on a Capacitive Touch Sensor channel.
„
‘1’ - The Noise Status registers will only show RF noise if it is detected on a Capacitive Touch
Sensor channel. Generic noise will still be detected and touches will be blocked normally; however,
the status bits will not be updated.
Bit 2 - DIS_RF_NOISE - Determines whether the RF noise filter is enabled. Setting this bit disables
the feature.
„
‘0’ (default) - If RF noise is detected by the analog block, the delta count on the corresponding
channel is set to 0. Note that this does not require that Noise Status bits be set.
„
‘1’ - A touch is not blocked even if RF noise is detected.
Bit 1 - VOL_UP_DOWN - Determines how the Grouped Sensors are to be used.
„
‘0’ (default) - The grouped sensors are used as a slider. All seven of the sensors are sampled
together and may disabled as a whole using the GP_EN (see Section 6.15) or GSLEEP (see
Section 6.22) controls or individually (using the Grouped Sensor Channel Enable register - see
Section 6.34). Alternately, each sensor may be disabled individually via the Group Sensor Channel
Enable register. They will use the Group Threshold settings for all touch detections.
„
‘1’ - The grouped sensors are used as separate sensors and are not grouped. They will behave
as follows:
1. Each sensor will flag individual interrupts when a touch is detected. They will set the
corresponding status bit in the Button Status 2 register.
2. The UP / DOWN, TAP, or PH status bits will not be set for CS9, CS10, CS11, CS12, or CS13.
No slide will be detected.
3. Each sensor will use the Group Threshold settings.
4. Each sensor can be individually enabled / disabled via the Grouped Sensor Enable register
settings.
5. All sensors except CS8 and CS14 will use the button queue controls and repeat rates.
6. The CS8 and CS14 sensors will use the tap and press and hold logic as well as the group
repeat rate settings.
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7. All sensors will use the group max duration settings if this feature is enabled via the
MAX_DUR_EN_G bit.
8. For CS8 and CS14, interrupts will be generated in the same way as they would be for a TAP
or Press and Hold event. This means that an interrupt will be generated on a touch. If the button
is held, interrupts will be generated at the Group Repeat rate until the button is released. These
buttons do not use the INT_REL_n control and will only generate an interrupt when a touch is
detected.
9. The CS8 sensor will be the designated “DOWN” button. When a tap or Press and Hold event
is detected, it will cause the DOWN status bit to be set. The TAP and PH status bits will be set
normally.
10. The CS14 sensor will be the designated “UP” button. When a Tap or Press and Hold event is
detected, it will cause the UP status bit to be set. The TAP and PH status bits will be set
normally.
Bit 0 - INT_REL_n - Controls the interrupt behavior when a release is detected on a button.
6.34
„
‘0’ (default) - An interrupt is generated when a press is detected and again when a release is
detected and at the repeat rate (if enabled - see Section 6.14 and Section 6.33).
„
‘1’ - An interrupt is generated when a press is detected and at the repeat rate (if enabled - see
Section 6.14 and Section 6.33).
Grouped Sensor Channel Enable Register
Table 6.51 Grouped Sensor Channel Enable Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
41h
R/W
Grouped Sensor
Channel Enable
-
CS14_
EN
CS13_
EN
CS12_
EN
CS11_
EN
CS10_
EN
CS9_
EN
CS8_
EN
7Fh
The Grouped Sensor Channel Enable Register enables sensors within Grouped Sensors to be
sampled during the polling cycle. This register may be updated at any time. If the grouped sensors are
treated as a group (see Section 6.33), then disabling one or more sensors will cause the slider to
behave erratically or not at all.
Bit 6 - CS14_EN - Enables the CS14 sensor to be sampled in the polling cycle.
Bit 5 - CS13_EN - Enables the CS13 sensor to be sampled in the polling cycle.
Bit 4 - CS12_EN - Enables the CS12 sensor to be sampled in the polling cycle.
Bit 3 - CS11_EN - Enables the CS11 sensor to be sampled in the polling cycle.
Bit 2 - CS10_EN - Enables the CS10 sensor to be sampled in the polling cycle.
Bit 1 - CS9_EN - Enables the CS9 sensor to be sampled in the polling cycle.
Bit 0 - CS8_EN - Enables the CS8 sensor to be sampled in the polling cycle.
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6.35
Proximity Control Register
Table 6.52 Proximity Control Register
ADDR
R/W
REGISTER
B7
B6
B5
42h
R/W
Proximity
Control
CS1_
PROX
PROX
_SUM
-
B4
B3
PROX_AVG
[1:0]
B2
B1
B0
DEFAULT
PROX_D_SENSE[2:0]
02h
The Proximity Control Register controls sensitivity settings for CS1.
Bit 7 - CS1_PROX - Determines the functionality of the CS1 channel.
„
‘0’ (default) - The CS1 channel is not measuring proximity. It will use the standard button queue
and data sensitivity controls. The Averaging will be set to a value of ‘1’. Writing to the
PROX_AVG[2:0] bits will change the averaging applied to CS1 (and only CS1).
„
‘1’ - The CS1 channel is measuring proximity. It will not use the queue. In addition, the CS1 channel
will not use the DELTA_SHIFT[2:0] sensitivity settings and will instead use the
PROX_D_SHIFT[2:0] settings. In Proximity mode, the signal is boosted by 8X to detect very small
capacitance changes.
Bit 6 - PROX_SUM - Determines whether the CS1 channel averaging will perform an average or
calculate the sum of the measured channel when comparing the delta count against the threshold.
„
‘0’ (default) - When configured to detect proximity, the CS1 channel delta counts will be the
average.
„
‘1’ - When configured to detect proximity, the CS1 channel will sum the results of the averages
rather than report the true average. This value will be compared against the threshold normally.
Note that this mode is intended for very small signal detection. Because the delta count is the
summation of several consecutive measurements, it may become very large. Adjustments to the
sensitivity and threshold values will be required to maintain proper operation.
Bits 5 - 3 - PROX_AVG[1:0] - Determines the averaging value used when CS1 is set to detect
proximity. When averaging is enabled (i.e. not set at a value of ‘1’), the CS1 sensor will be sampled
the average number of times consecutively during the same polling cycle. The delta counts are
summed and then divided by the number of averages to get an average delta which is compared
against the threshold normally.
This will increase the time of the polling cycle linearly with the number of averages taken. As the polling
cycle time is used to set the update rate, repeat rate, and recalibration times, these will likewise
increase. See Table 6.53.
Table 6.53 PROX_AVG Bit Decode
PROX_AVG[1:0]
1
0
NUMBER OF DIGITAL
AVERAGES
POLLING CYCLE TIME
INCREASE (SEE Note 6.4)
0
0
16 (default)
+38ms
0
1
32
+79ms
1
0
64
+161ms
1
1
128
+325ms
Note 6.4
SMSC CAP1214
The Polling time increase is based on the default sampling time as determined by the
Sampling Configuration register (see Section 6.37).
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Bits 2 - 0 - PROX_D_SENSE[2:0] - Controls the sensitivity of detecting proximity. The sensitivity
settings act to scale the relative delta count value higher or lower based on the system parameters. A
setting of 0000b is the most sensitive while a setting of 1111b is the least sensitive. At the more
sensitive settings, touches are detected for a smaller delta C corresponding to a “lighter” touch. These
settings are more sensitive to noise, however, and a noisy environment may flag more false touches
than less sensitive levels. See Table 6.17.
6.36
Sampling Channel Select Register
Table 6.54 Sampling Channel Select Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
4Eh
R/W
Sampling
Channel Select
GR_S
CS7_S
CS6_S
CS5_S
CS4_S
CS3_S
CS2_S
CS1_S
00h
The Sampling Channel Select Register determines which (if any) Capacitive Sensor input is controlled
by the Sampling Configuration register.
Bit 7 - GR_S - Determines if all grouped sensors are controlled by the Sampling Configuration register
settings.
„
‘0’ (default) - The grouped sensors are not controlled by the Sampling Configuration register
settings. All Grouped sensors will be sampled in a 2.5ms window of the entire polling cycle (which
requires 35ms).
„
‘1’ - The grouped sensors are controlled by the Sampling Configuration register settings. Each
sensor sampling window will be determined based on these bit settings and the overall polling cycle
time will increase.
Bit 6 - CS7_S - Determines if Capacitive Touch Sensor 7 is controlled by the Sampling Configuration
register settings.
Bit 5 - CS6_S - Determines if Capacitive Touch Sensor 6 is controlled by the Sampling Configuration
register settings.
Bit 4 - CS5_S - Determines if Capacitive Touch Sensor 5 is controlled by the Sampling Configuration
register settings.
Bit 3 - CS4_S - Determines if Capacitive Touch Sensor 4 is controlled by the Sampling Configuration
register settings.
Bit 2 - CS3_S - Determines if Capacitive Touch Sensor 3 is controlled by the Sampling Configuration
register settings.
Bit 1 - CS2_S - Determines if Capacitive Touch Sensor 2 is controlled by the Sampling Configuration
register settings.
Bit 0 - CS1_S - Determines if Capacitive Touch Sensor 1 is controlled by the Sampling Configuration
register settings.
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6.37
Sampling Configuration Register
Table 6.55 Sampling Configuration Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
4Fh
R/W
Sampling
Configuration
-
-
-
-
-
B2
B1
B0
DEFAULT
OVERSAMP_RATE[2:0]
00h
The Sampling Configuration Register controls the length of the sampling window of selected Capacitive
Touch Sensor channels as indicated in the Sampling Channel Select register.
Increasing the sampling window time will have two effects. The first effect will be to increase the
effective sensitivity of that particular channel so that a touch may be detected with a smaller ΔC.
However, at the larger sampling times, the resolution of the measurement is reduced.
The second effect will be increase the overall round robin rate (and all timing associated with the round
robin rate such as re-calibration times, repeat rate times, and maximum duration times).
All Capacitive Touch Sensors default to a sampling time of 2.5ms. Increasing the sampling time of any
single channel will increase the overall polling cycle by the same amount.
Bits 2 - 0 - OVERSAMP_RATE[2:0] - Determine the time to take a single sample. This setting applies
to all selected sensors.
Table 6.56 OVERSAMP_RATE Bit Decode
OVERSAMP_RATE[2:0]
6.38
2
1
0
SENSOR SAMPLING
TIME
1
0
0
40ms
1
0
1
20ms
1
1
0
10ms
1
1
1
5ms
0
0
0
2.5ms (default)
0
0
1
1.28ms
0
1
0
0.64ms
0
1
1
0.32ms
Sensor Base Count Registers
Table 6.57 Sensor Base Count Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
50h
R
Sensor 1 Base
Count
128
64
32
16
8
4
2
1
00h
51h
R
Sensor 2 Base
Count
128
64
32
16
8
4
2
1
00h
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Table 6.57 Sensor Base Count Registers (continued)
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
52h
R
Sensor 3 Base
Count
128
64
32
16
8
4
2
1
00h
53h
R
Sensor 4 Base
Count
128
64
32
16
8
4
2
1
00h
54h
R
Sensor 5 Base
Count
128
64
32
16
8
4
2
1
00h
55h
R
Sensor 6 Base
Count
128
64
32
16
8
4
2
1
00h
56h
R
Sensor 7 Base
Count
128
64
32
16
8
4
2
1
00h
57h
R
Sensor 8 Base
Count
128
64
32
16
8
4
2
1
00h
58h
R
Sensor 9 Base
Count
128
64
32
16
8
4
2
1
00h
59h
R
Sensor 10
Base Count
128
64
32
16
8
4
2
1
00h
5Ah
R
Sensor 11
Base Count
128
64
32
16
8
4
2
1
00h
5Bh
R
Sensor 12
Base Count
128
64
32
16
8
4
2
1
00h
5Ch
R
Sensor 13
Base Count
128
64
32
16
8
4
2
1
00h
5Dh
R
Sensor 14
Base Count
128
64
32
16
8
4
2
1
00h
The Sensor Base Count Registers store the calibrated “Not Touched” input value from the Capacitive
Touch Sensor inputs. These registers are periodically updated by the re-calibration routine.
The routine uses an internal adder to add the current count value for each reading to the sum of the
previous readings until sample size has been reached. At this point, the upper 16 bits are taken and
used as the Sensor Base Count. The internal adder is then reset and the re-calibration routine
continues.
The data presented is determined by the BASE_SHIFT bits (see Section 6.13).
6.39
LED Status Registers
Table 6.58 LED Status Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
60h
R
LED Status 1
LED8_
DN
LED7_
DN
LED6_
DN
LED5_
DN
LED4_
DN
LED3_
DN
LED2_
DN
LED1_
DN
00h
61h
R
LED Status 2
-
-
-
-
-
LED11_
DN
LED10_
DN
LED9_
DN
00h
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The LED Status Registers indicate when an LED has completed its configured behavior (see Section
6.51, "LED Behavior Registers") after being actuated by the host (see Section 6.46, "LED Output
Control Registers"). These bits are ignored when the LED is linked to a capacitive sensor input. The
bits are cleared when the INT bit has been cleared. Likewise, these bits are cleared when the DSLEEP
bit is set.
6.39.1
LED Status 1
Bit 7 - LED8_DN - Indicates that LED8 has finished its behavior after being actuated by the host.
Bit 6 - LED7_DN - Indicates that LED7 has finished its behavior after being actuated by the host.
Bit 5 - LED6_DN - Indicates that LED6 has finished its behavior after being actuated by the host.
Bit 4 - LED5_DN - Indicates that LED5 has finished its behavior after being actuated by the host.
Bit 3 - LED4_DN - Indicates that LED4 has finished its behavior after being actuated by the host.
Bit 2 - LED3_DN - Indicates that LED3 has finished its behavior after being actuated by the host.
Bit 1 - LED2_DN - Indicates that LED2 has finished its behavior after being actuated by the host.
Bit 0 - LED1_DN - Indicates that LED1 has finished its behavior after being actuated by the host.
6.39.2
LED Status 2
Bit 2 - LED11_DN - Indicates that LED11 has finished its behavior after being actuated by the host.
Bit 1 - LED10_DN - Indicates that LED10 has finished its behavior after being actuated by the host.
Bit 0 - LED9_DN - Indicates that LED9 has finished its behavior after being actuated by the host.
6.40
Feedback Configuration Register
Table 6.59 Feedback Configuration Register
ADDR
R/W
REGISTER
62h
R/W
Feedback
Configuration
B7
B6
B5
B4
FDBK_DUR[2:0]
B3
B2
B1
B0
FDBK_FREQ[4:0]
DEFAULT
00h
The Feedback Configuration Register controls the output of the FEEDBACK pin (see Section 5.7,
"FEEDBACK Pin").
APPLICATION NOTE: When linked to one or more sensors, the FEEDBACK pin will be activated when a touch is
detected. If the duration, frequency, or linking is changed while the FEEDBACK pin is active,
these changes will be applied the next time that the FEEDBACK pin is activated.
APPLICATION NOTE: If linked to one or more sensors and a second touch is detected while the FEEDBACK pin
is active, it will be restarted immediately without completing the current activity duration. Any
previously programmed setting changes are applied.
Bits 7-5 - FDBK_DUR[2:0] - Controls the duration of the FEEDBACK pin output (see Table 6.60).
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Table 6.60 FDBK_DUR Bit Decode
FDBK_DUR[2:0]
2
1
0
DURATION
0
0
0
0 (disabled) (default)
0
0
1
8ms
0
1
0
16ms
0
1
1
32ms
1
0
0
64ms
1
0
1
128ms
1
1
0
256ms
1
1
1
while button is pressed
Bits 4-0 - FDBK_FREQ[4:0] - Controls the frequency of the FEEDBACK pin output. The LSB
represents 125Hz. For example, a setting of 00100b (04d) represents a frequency of 500Hz (125Hz x
4 = 500Hz). The total range is from 125 Hz to 3875Hz.
A setting of 00000b uses DC, which will set the output full high for the specified duration.
6.41
Feedback Channel Configuration Registers
Table 6.61 Feedback Channel Configuration Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
63h
R/W
Feedback
Channel
Configuration 1
-
CS7_
FDBK
CS6_
FDBK
CS5_
FDBK
CS4_
FDBK
CS3_
FDBK
CS2_
FDBK
CS1_
FDBK
00h
64h
R/W
Feedback
Channel
Configuration 2
-
CS14_
FDBK
CS13_
FDBK
CS12_
FDBK
CS11_
FDBK
CS10_
FDBK
CS9_
FDBK
CS8_
FDBK
00h
The Feedback Channel Configuration Registers control which sensors are linked to the FEEDBACK
pin (see Section 5.7, "FEEDBACK Pin").
6.41.1
Feedback Channel Configuration 1
For all bits in this register:
„
‘0’ (default) - The sensor input is not linked to the FEEDBACK pin.
„
‘1’ - The sensor is linked to the FEEDBACK pin and will assert the pin when a touch is detected.
Bit 6 - CS7_FDBK - Links the CS7 input to the FEEDBACK pin.
Bit 5 - CS6_FDBK - Links the CS6 input to the FEEDBACK pin.
Bit 4 - CS5_FDBK - Links the CS5 input to the FEEDBACK pin.
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Bit 3 - CS4_FDBK - Links the CS4 input to the FEEDBACK pin.
Bit 2 - CS3_FDBK - Links the CS3 input to the FEEDBACK pin.
Bit 1 - CS2_FDBK - Links the CS2 input to the FEEDBACK pin.
Bit 0 - CS1_FDBK - Links the CS1 input to the FEEDBACK pin.
6.41.2
Feedback Channel Configuration 2
For all bits in this register:
„
‘0’ (default) - The sensor input is not linked to the FEEDBACK pin.
„
‘1’ - The sensor is linked to the FEEDBACK pin and will assert the pin when a touch is detected.
Bit 6 - CS14_FDBK - Links the CS14 input to the FEEDBACK pin.
Bit 5 - CS13_FDBK - Links the CS13 input to the FEEDBACK pin.
Bit 4 - CS12_FDBK - Links the CS12 input to the FEEDBACK pin.
Bit 3 - CS11_FDBK - Links the CS11 input to the FEEDBACK pin.
Bit 2 - CS10_FDBK - Links the CS10 input to the FEEDBACK pin.
Bit 1 - CS9_FDBK - Links the CS9 input to the FEEDBACK pin.
Bit 0 - CS8_FDBK - Links the CS8 input to the FEEDBACK pin.
6.42
Feedback One-Shot Register
Table 6.62 Feedback One-Shot Register
ADDR
R/W
REGISTER
65h
R/W
Feedback
One-Shot
B7
B6
B5
B4
B3
B2
B1
B0
Writing to this register asserts the FEEDBACK pin for the configured duration
at the configured frequency.
DEFAULT
00h
The Feedback One-Shot Register allows the application to notify the CAP1214 to assert the
FEEDBACK pin (see Section 5.7, "FEEDBACK Pin"). This register is self-clearing.
APPLICATION NOTE: If the FDBK_DUR[2:0] settings are set at either ‘000b’ or ‘111b’, this one-shot will not
function.
6.43
LED / GPIO Direction Register
Table 6.63 LED / GPIO Direction Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
70h
R/W
LED / GPIO
Direction
LED8_
DIR
LED7_
DIR
LED6_
DIR
LED5_
DIR
LED4_
DIR
LED3_
DIR
LED2_
DIR
LED1_
DIR
00h
The LED / GPIO Direction Register controls the data flow direction for the LED / GPIO pins. Each pin
is controlled by a single bit.
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Bit 7 - LED8_DIR - Controls the direction of the LED8 / GPIO8 pin.
„
‘0’ (default) - The LED8 / GPIO8 pin is configured as an input and cannot be used to drive an LED.
„
‘1’ - The LED8 / GPIO8 pin is configured as an output.
Bit 6 - LED7_DIR - Controls the direction of the LED7 / GPIO7 pin.
Bit 5 - LED6_DIR - Controls the direction of the LED6 / GPIO6 pin.
Bit 4 - LED5_DIR - Controls the direction of the LED5 / GPIO5 pin.
Bit 3 - LED4_DIR - Controls the direction of the LED4 / GPIO4 pin.
Bit 2 - LED3_DIR - Controls the direction of the LED3 / GPIO3 pin.
Bit 1 - LED2_DIR - Controls the direction of the LED2 / GPIO2 pin.
Bit 0 - LED1_DIR - Controls the direction of the LED1 / GPIO1 pin.
6.44
LED / GPIO Output Type Register
Table 6.64 LED / GPIO Output Type Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
71h
R/W
LED / GPIO
Output Type
LED8_
OT
LED7_
OT
LED6_
OT
LED5_
OT
LED4_
OT
LED3_
OT
LED2_
OT
LED1_
OT
00h
The LED / GPIO Output Type Register controls the type of output for the LEDx / GPIOx pins that are
configured to operate as outputs. Each pin is controlled by a single bit.
Bit 7 - LED8_OT - Determines the output type of LED8.
„
‘0’ (default) - The LED8 / GPIO8 pin is an open-drain output with an external pull-up resistor. When
the appropriate bit is set to the “active” state (logic ‘1’), the pin will be driven low. Conversely, when
the bit is set to the “inactive” state (logic ‘0’), the pin will be left in a high-Z state and pulled high
via an external pull-up resistor.
„
‘1’ - The LEDx / GPIO8 pin is a push-pull output. When driving a logic ‘1’, the pin is driven high.
When driving a logic ‘0’, the pin is driven low.
Bit 6 - LED7_OT - Determines the output type of LED7.
Bit 5 - LED6_OT - Determines the output type of LED6.
Bit 4 - LED5_OT - Determines the output type of LED5.
Bit 3 - LED4_OT - Determines the output type of LED4.
Bit 2 - LED3_OT - Determines the output type of LED3.
Bit 1 - LED2_OT - Determines the output type of LED2.
Bit 0 - LED1_OT - Determines the output type of LED1.
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6.45
GPIO Input Register
Table 6.65 GPIO Input Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
72h
R
GPIO Input
GPIO8
GPIO7
GPIO6
GPIO5
GPIO4
GPIO3
GPIO2
GPIO1
00h
The GPIO Input Register reflects the state of the LEDx / GPIOx pins. These bits are updated whenever
the pin state changes regardless of the operation of the pin. If a LEDx / GPIOx pin is configured as
an input (see Section 6.40), when a pin changes states, the GPIOx_STS bit is set. If the corresponding
interrupt enable bit is also set, an interrupt will be asserted.
6.46
LED Output Control Registers
Table 6.66 LED Output Control Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
73h
R/W
LED Output
Control 1
LED8_
DR
LED7_
DR
LED6_
DR
LED5_
DR
LED4_
DR
LED3_
DR
LED2_
DR
LED1_
DR
00h
74h
R/W
LED Output
Control 2
LED11_
DR
LED10_
DR
LED9_
DR
00h
The LED Output Control Registers control the output state of the LED pins when they are configured
as outputs (see Section 6.43, "LED / GPIO Direction Register") and are not linked to sensor inputs
(see Section 6.50, "Sensor LED Linking Register"). When these bits are set, the drive of the pin is
determined by the output type and the polarity controls (see Section 6.44, "LED / GPIO Output Type
Register" and Section 6.47, "LED Polarity Registers").
The LED Polarity Control register will determine the non actuated state of the LED pins. The actuated
LED behavior is determined by the LED behavior controls (see Section 6.51, "LED Behavior
Registers").
6.46.1
LED Output Control 1
Bit 7 - LED8_DR - Determines whether the LED8 output is driven high or low. This LED cannot be
linked to a Capacitive Touch Sensor.
„
‘0’ (default) - The LED8 output is driven at the minimum duty cycle or is not actuated.
„
‘1’ - The LED8 output is high-Z or driven at the maximum duty cycle or is actuated.
Bit 6 - LED7_DR - Determines whether LED7 output is driven high or low.
Bit 5 - LED6_DR - Determines whether LED6 output is driven high or low.
Bit 4 - LED5_DR - Determines whether LED5 output is driven high or low.
Bit 3 - LED4_DR - Determines whether LED4 output is driven high or low.
Bit 2 - LED3_DR - Determines whether LED3 output is driven high or low.
Bit 1 - LED2_DR - Determines whether LED2 output is driven high or low.
Bit 0 - LED1_DR - Determines whether LED1 output is driven high or low.
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6.46.2
LED Output Control 2
Bit 2 - LED11_DR - Determines whether LED11 is driven high or low. This LED cannot be linked to a
Capacitive Touch Sensor.
„
‘0’ (default) - The LED11 output is driven at the minimum duty cycle or is not actuated
„
‘1’ - The LED11 output is high-Z or driven at the maximum duty cycle or is actuated.
Bit 1 - LED10_DR - Determines whether LED10 is driven high or low. If this LED is linked to the Group
of sensors, LED9 is automatically linked to the Group if sensors.
Bit 0 - LED9_DR - Determines whether LED9 is driven high or low.
6.47
LED Polarity Registers
Table 6.67 LED Polarity Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
75h
R/W
LED Polarity
1
LED8_
POL
LED7_
POL
LED6_
POL
LED5_
POL
LED4_
POL
LED3_
POL
LED2_
POL
LED1_
POL
00h
76h
R/W
LED Polarity
2
-
-
-
-
-
LED11_
POL
LED10_
POL
LED9_
POL
00h
The LED Polarity Registers control the logical polarity of the LED outputs. When these bits are set or
cleared, the corresponding LED Mirror controls are also set or cleared (unless the BLK_POL_MIR bit
is set - see Section 6.33). Table 6.68, "LED Polarity Behavior" shows the interaction between the
polarity controls, output controls, and relative brightness.
APPLICATION NOTE: The polarity controls determine the final LED pin drive. A touch on a linked Capacitive Touch
Sensor is treated in the same way as the LED Output Control bit being set to a logic ‘1’.
APPLICATION NOTE: The LED drive assumes that the LEDs are configured such that if the LED pin is driven to
a logic ‘0’, the LED will be on and the CAP1214 LED pin is sinking the LED current.
Conversely, if the LED pin is driven to a logic ‘1’, the LED will be off and there is no current
flow. See Figure 5.1, "System Diagram for CAP1214".
APPLICATION NOTE: This application note applies when the LED polarity is inverted (LEDx_POL = ‘0’). For LED
operation, the duty cycle settings determine the % of time that the LED pin will be driven to
a logic ‘0’ state in an inverted system. The Max Duty Cycle settings define the maximum %
of time that the LED pin will be driven low (i.e. maximum % of time that the LED is on) while
the Min Duty Cycle settings determine the minimum % of time that the LED pin will be driven
low (i.e. minimum % of time that the LED is on). When there is no touch detected or the
LED Output Control register bit is at a logic ‘0’, the LED output will be driven at the minimum
duty cycle setting. Breathe operations will ramp the duty cycle from the minimum duty cycle
to the maximum duty cycle.
APPLICATION NOTE: This application note applies when the LED polarity is non-inverted (LEDx_POL = ‘1’). For
LED operation, the duty cycle settings determine the % of time that the LED pin will be driven
to a logic ‘1’ state in a non-inverted system. The Max Duty Cycle settings define the
maximum % of time that the LED pin will be driven high (i.e. maximum % of time that the
LED is off) while the Min Duty Cycle settings determine the minimum % of time that the LED
pin will be driven high (i.e. minimum % of time that the LED is off). When there is no touch
detected or the LED Output Control register bit is at a logic ‘0’, the LED output will be driven
at 100 minus the minimum duty cycle setting. Breathe operations will ramp the duty cycle
from 100 minus the minimum duty cycle to 100 minus the maximum duty cycle.
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APPLICATION NOTE: The LED Mirror controls (see Section 6.49, "LED Mirror Control") work with the polarity
controls with respect to LED brightness but will not have a direct effect on the output pin
drive.
Table 6.68 LED Polarity Behavior
LED
OUTPUT
CONTROL
REGISTER
MAX DUTY
MIN DUTY
BRIGHTNESS
LED
APPEARANCE
0
inverted
(‘0’)
not used
minimum %
of time that
the LED is on
(logic 0)
maximum brightness at min
duty cycle
on at min duty
cycle
1
inverted
(‘0’)
maximum %
of time that
the LED is on
(logic 0)
minimum %
of time that
the LED is on
(logic 0)
maximum brightness at max
duty cycle. Brightness ramps
from min duty cycle to max duty
cycle.
according to
LED behavior
0
noninverted
(‘1’)
not used
minimum %
of time that
the LED is off
(logic 1)
maximum brightness at 100
minus min duty cycle
on at 100 - min
duty cycle
noninverted
(‘1’)
maximum %
of time that
the LED is off
(logic 1)
minimum %
of time that
the LED is off
(logic 1)
For Direct behavior, maximum
brightness is 100 minus max
duty cycle. When breathing,
max brightness is 100 minus
min duty cycle. Brightness
ramps from 100 - min duty
cycle to 100 - max duty cycle.
according to
LED behavior
POLARITY
1
6.47.1
LED Polarity 1
Bit 7 - LED8_POL - Determines the polarity of the LED8 output.
„
‘0’ - The LED8 output is inverted. For example, a setting of ‘1’ in the LED 8 Output register will
cause the LED pin output to be driven to a logic ‘0’.
„
‘1’ - The LED8 output is non-inverted. For example, a setting of ‘1’ in the LED 8 Output register
will cause the LED pin output to be driven to a logic ‘1’ or left in the high-Z state as determined by
its output type.
Bit 6 - LED7_POL - Determines the polarity of the LED7 output.
Bit 5 - LED6_POL - Determines the polarity of the LED6 output.
Bit 4 - LED5_POL - Determines the polarity of the LED5 output.
Bit 3 - LED4_POL - Determines the polarity of the LED4 output.
Bit 2 - LED3_POL - Determines the polarity of the LED3 output.
Bit 1 - LED2_POL - Determines the polarity of the LED2 output.
Bit 0 - LED1_POL - Determines the polarity of the LED1 output.
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6.47.2
LED Polarity 2
Bit 2 - LED11_POL - Determines the polarity of the LED11 output.
Bit 1 - LED10_POL - Determines the polarity of the LED10 output.
Bit 0 - LED9_POL - Determines the polarity of the LED9 output.
6.48
Linked LED Transition Control Registers
Table 6.69 Linked LED Transition Control Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
77h
R/W
Linked LED
Transition Control 1
-
LED7_
LTRAN
LED6_
LTRAN
LED5_
LTRAN
LED4_
LTRAN
LED3_
LTRAN
LED2_
LTRAN
LED1_
LTRAN
00h
78h
R/W
Linked LED
Transition Control 2
-
-
-
-
-
-
LED10_
LTRAN
LED9_
LTRAN
00h
The Linked LED Transition Control Registers control the LED drive when the LED is linked to a
Capacitive Touch sensor. These controls work in conjunction INV_LINK_TRAN bit (see Section 6.33,
"Configuration 2 Register") to create smooth transitions from host control to linked LEDs.
6.48.1
Linked LED Transition Control 1 - 77h
Bit 6 - LED7_LTRAN - Determines the transition effect when LED7 is linked to CS7.
„
‘0’ (default) - When the LED output control bit for CS7 is ‘1’, and then CS7 is linked to LED7 and
no touch is detected, the LED will change states.
„
‘1’ - If the INV_LINK_TRAN bit is ‘1’, when the LED output control bit for CS7 is ‘1’, and then CS7
is linked to LED7 and no touch is detected, the LED will not change states. In addition, the LED
state will change when the sensor is touched. If the INV_LINK_TRAN bit is ‘0’, when the LED
output control bit for CS7 is ‘1’, and then CS7 is linked to LED7 and no touch is detected, the LED
will not change states. However, the LED state will not change when the sensor is touched.
APPLICATION NOTE: If the LED behavior is not “Direct” and the INV_LINK_TRAN bit it ‘0’, the LED will not perform
as expected when the LED7_LTRAN bit is set to ‘1’. Therefore, if breathe and pulse
behaviors are used, set the INV_LINK_TRAN bit to ‘1’.
Bit 5 - LED6_LTRAN - Determines the transition effect when LED6 is linked to CS6.
Bit 4 - LED5_LTRAN - Determines the transition effect when LED5 is linked to CS5.
Bit 3 - LED4_LTRAN - Determines the transition effect when LED4 is linked to CS4.
Bit 2 - LED3_LTRAN - Determines the transition effect when LED3 is linked to CS3.
Bit 1 - LED2_LTRAN - Determines the transition effect when LED2 is linked to CS2.
Bit 0 - LED1_LTRAN - Determines the transition effect when LED1 is linked to CS1.
6.48.2
Linked LED Transition Control 2 - 78h
Bit 1 - LED10_LTRAN - Determines the transition effect when LED10 is linked to the Grouped Sensors.
Bit 0 - LED9_LTRAN - Determines the transition effect when LED9 is linked to the Grouped Sensors.
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6.49
LED Mirror Control
Table 6.70 LED Mirror Control Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
79h
R/W
LED Mirror
Control 1
LED8_
MIR _
EN
LED7_
MIR _
EN
LED6_
MIR _
EN
LED5_
MIR _
EN
LED4_
MIR _
EN
LED3_
MIR _
EN
LED2_
MIR _
EN
LED1_
MIR _
EN
00h
7Ah
R/W
LED Mirror
Control 2
-
-
-
-
-
LED11_
MIR _
EN
LED10_
MIR _
EN
LED9_
MIR _
EN
00h
The LED Mirror Control Registers determine the meaning of duty cycle settings when polarity is noninverted for each LED channel. When the polarity bit is set to ‘1’ (non-inverted), to obtain correct steps
for LED ramping, pulse, and breathe behaviors, the min and max duty cycles need to be relative to
100%, rather than the default, which is relative to 0%.
APPLICATION NOTE: The LED drive assumes that the LEDs are configured such that if the LED pin is driven to
a logic ‘0’, the LED will be on and the CAP1214 LED pin is sinking the LED current. When
the polarity bit is set to ‘1’, it is considered non-inverted. For systems using the opposite LED
configuration, mirror controls would apply when the polarity bit is ‘0’.
These bits are changed automatically if the corresponding LED Polarity bit is changed (unless the
BLK_POL_MIR bit is set - see Section 6.33).
6.49.1
LED Mirror Control 1 - 79h
Bit 7 - LED8_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%
duty cycle.
„
‘0’ (default) - The duty cycle settings are determined relative to 0% and are determined directly with
the settings.
„
‘1’ - The duty cycle settings are determined relative to 100%.
Bit 6 - LED7_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%
duty cycle.
Bit 5 - LED6_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%
duty cycle.
Bit 4 - LED5_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%
duty cycle.
Bit 3 - LED4_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%
duty cycle.
Bit 2 - LED3_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%
duty cycle.
Bit 1 - LED2_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%
duty cycle.
Bit 0 - LED1_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%
duty cycle.
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6.49.2
LED Mirror Control 2 - 7Ah
Bit 2 - LED11_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or
100% duty cycle.
Bit 1 - LED10_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or
100% duty cycle.
Bit 0 - LED9_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%
duty cycle.
6.50
Sensor LED Linking Register
Table 6.71 Sensor LED Linking Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
80h
R/W
Sensor LED
Linking
UP_
DOWN _
LINK
CS7_
LED7
CS6_
LED6
CS5_
LED5
CS4_
LED4
CS3_
LED3
CS2_
LED2
CS1_
LED1
00h
The Sensor LED Linking Register controls whether a Capacitive Touch Sensor is linked to an LED
output. If the corresponding bit is set, the appropriate LED output will change states defined by the
LED Behavior controls (see Section 6.51, "LED Behavior Registers") in response to the Capacitive
Touch sensor.
If the LED channel is configured as an input, the corresponding Sensor LED Linking bit is ignored.
Bit 7 - UP_DOWN_LINK - Links the LED10 output to a detected UP condition on the group including
a slide in the “up” direction, a tap on the “up” side of the group or a press and hold condition on the
“up” side of the group. The LED10 driver will be actuated and will behave as determined by the
LED10_CTL bits. This bit also links the LED9 output to a detected DOWN condition on the group
including a slide in the “down” direction, a tap on the “down” side of the group or a press and hold
condition on the “down” side of the group. The LED9 driver will be actuated and will behave as
determined by the LED9_CTL bits.
LED9 and LED10 will not be active simultaneously. If LED9 is actuated by detecting a slide, tap, or
press and hold event, LED10 will be inactive. Likewise, if LED10 is actuated by detecting a slide, tap,
or press and hold event, LED9 will be inactive.
Bit 6 - CS7_LED7 - Links the LED7 output to a detected touch on the CS7 sensor. When a touch is
detected, the LED is actuated and will behave as determined by the LED Behavior controls.
„
‘0’ - The LED7 output is not associated with the CS7 input. If a touch is detected on the CS7 input,
the LED will not automatically be actuated. The LED is enabled and controlled via the LED Output
Configuration register (see Section 6.46) and the LED Behavior registers (see Section 6.51).
„
‘1’ - The LED 7 output is associated with the CS7 input. If a touch is detected on the CS7 input,
the LED will be actuated and behave as defined in Table 6.73. Furthermore, the LED will
automatically be enabled.
Bit 5 - CS6_LED6 - Links the LED6 output to a detected touch on the CS6 sensor. When a touch is
detected, the LED is actuated and will behave as determined by the LED Behavior controls.
Bit 4 - CS5_LED5 - Links the LED5 output to a detected touch on the CS5 sensor. When a touch is
detected, the LED is actuated and will behave as determined by the LED Behavior controls.
Bit 4 - CS4_LED4 - Links the LED4 output to a detected touch on the CS4 sensor. When a touch is
detected, the LED is actuated and will behave as determined by the LED Behavior controls.
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Bit 2 - CS3_LED3 - Links the LED3 output to a detected touch on the CS3 sensor. When a touch is
detected, the LED is actuated and will behave as determined by the LED Behavior controls.
Bit 1 - CS2_LED2 - Links the LED2 output to a detected touch on the CS2 sensor. When a touch is
detected, the LED is actuated and will behave as determined by the LED Behavior controls.
Bit 0 - CS1_LED1 - Links the LED1 output to a detected touch on the CS1 sensor. When a touch is
detected, the LED is actuated and will behave as determined by the LED Behavior controls.
6.51
LED Behavior Registers
Table 6.72 LED Behavior Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
81h
R/W
LED Behavior 1
LED4_CTL[1:0]
LED3_CTL[1:0]
LED2_CTL[1:0]
LED1_CTL[1:0]
00h
82h
R/W
LED Behavior 2
LED8_CTL[1:0]
LED7_CTL[1:0]
LED6_CTL[1:0]
LED5_CTL[1:0]
00h
83h
R/W
LED Behavior 3
LED11_ALT [1:0]
LED11_CTL [1:0]
LED10_CTL [1:0]
LED9_CTL[1:0]
00h
The LED Behavior Registers control the operation of LEDs. Each LEDx / GPIOx pin is controlled by a
2-bit field. If the LEDx / GPIOx pin is configured as an input, these bits are ignored.
If the corresponding LED output is linked to a Capacitive Touch Sensor, the appropriate behavior will
be enabled / disabled based on touches and releases.
If the LED output is not associated with a Capacitive Touch Sensor, the appropriate behavior will be
enabled / disabled by the LED Output Control register. If the respective LEDx_DR bit is set to a logic
‘1’, this will be associated as a “touch”, and if the LEDx_DR bit is set to a logic ‘0’, this will be
associated as a “release”.
Table 6.73 shows the behavior triggers. The defined behavior will activate when the Start Trigger is
met and will stop when the Stop Trigger is met. Note the behavior of the Breathe Hold and Pulse
Release option.
The LED Polarity Control register will determine the non actuated state of the LED outputs (see Section
6.47, "LED Polarity Registers").
APPLICATION NOTE: If an LED is not linked to a Capacitive Touch Sensor and is breathing (via the Breathe or
Pulse behaviors), it must be unactuated before any changes to behavior are processed.
APPLICATION NOTE: If an LED is not linked to the Capacitive Touch Sensor and configured to operate using Pulse
1 Behavior, the circuitry will only be actuated when the corresponding bit is set. It will not
check the bit condition until the Pulse 1 behavior is finished. The device will not remember
if the bit was cleared and reset while it was actuated.
APPLICATION NOTE: If an LED is actuated and it is switched from linked to a Capacitive Touch Sensor to unlinked
(or vice versa), the LED will respond to the new command source immediately if the behavior
was Direct or Breathe. For Pulse behaviors, it will complete the behavior already in progress.
For example, if a linked LED was actuated by a touch and the control is changed so that it
is unlinked, it will check the status of the corresponding LED Output Control bit. If that bit is
‘0’, the LED will behave as if a release was detected. Likewise, if an unlinked LED was
actuated by the LED Output Control register and the control is changed so that it is linked
and no touch is detected, the LED will behave as if a release was detected.
6.51.1
LED Behavior 1 - 81h
Bits 7 - 6 - LED4_CTL[1:0] - Determines the behavior of LED4 / GPIO4 when configured to operate
as an LED output.
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Bits 5 - 4 - LED3_CTL[1:0] - Determines the behavior of LED3 / GPIO3 when configured to operate
as an LED output.
Bits 3 - 2 - LED2_CTL[1:0] - Determines the behavior of LED2 / GPIO2 when configured to operate
as an LED output.
Bits 1 - 0 - LED1_CTL[1:0] - Determines the behavior of LED1 / GPIO1 when configured to operate
as an LED output.
6.51.2
LED Behavior 2 - 82h
Bits 7 - 6 - LED8_CTL[1:0] - Determines the behavior of LED8 / GPIO8 when configured to operate
as an LED output.
Bits 5 - 4 - LED7_CTL[1:0] - Determines the behavior of LED7 / GPIO7 when configured to operate
as an LED output.
Bits 3 - 2 - LED6_CTL[1:0] - Determines the behavior of LED6 / GPIO6 when configured to operate
as an LED output.
Bits 1 - 0 - LED5_CTL[1:0] - Determines the behavior of LED5 / GPIO5 when configured to operate
as an LED output.
6.51.3
LED Behavior 3 - 83h
Bits 7 - 6 - LED11_ALT[1:0] - Determines the behavior of LED11 when the PWR_LED bit is set and
either the SLEEP or DSLEEP bits are set (see Section 6.1).
Bits 5 - 4 - LED11_CTL[1:0] - Determines the behavior of LED11 when the PWR_LED bit is set and
both the SLEEP and DSLEEP bits are not set (see Section 6.1). It also determines the behavior when
the LED is driven by setting bit 2 LED11_DR in the LED Output Control 2 Register (74h).
Bits 3 - 2 - LED10_CTL[1:0] - Determines the behavior of LED10.
Bits 1 - 0 - LED9_CTL[1:0] - Determines the behavior of LED9.
APPLICATION NOTE: When driving the LED / GPIOx output as a GPO, the LEDx_CTL[1:0] bits should be set to
00b.
Table 6.73 LEDx_CTL Bit Decode
LEDX_CTL
[1:0]
1
0
0
0
START
TRIGGER
STOP
TRIGGER
Direct
The LED is driven to the programmed state
(active or inactive). See Figure 6.7
Touch Detected
or LED Output
Control bit set
Release
Detected or
LED Output
Control bit
cleared
Pulse 1
The LED will “Pulse” a programmed
number of times. During each “Pulse” the
LED will breathe up to the maximum
brightness and back down to the minimum
brightness so that the total “Pulse” period
matches the programmed value.
Touch or
Release
Detected or LED
Output Control
bit set or cleared
(see
Section 6.52)
n/a
OPERATION
DESCRIPTION
0
1
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Table 6.73 LEDx_CTL Bit Decode (continued)
LEDX_CTL
[1:0]
1
0
1
0
1
1
START
TRIGGER
STOP
TRIGGER
Pulse 2
The LED will “Pulse” when the start trigger
is detected. When the stop trigger is
detected, it will “Pulse” a programmable
number of times then return to its minimum
brightness.
Touch Detected
or LED Output
Control bit set
Release
Detected or
LED Output
Control bit
cleared
Breathe
The LED will breathe. It will be driven with
a duty cycle that ramps up from the
programmed minimum duty cycle (default
0%) to the programmed maximum duty
cycle (default 100%) and then back down.
Each ramp takes up 50% of the
programmed period. The total period of
each “breath” is determined by the LED
Breathe Period controls - see Section 6.54.
Touch Detected
or LED Output
Control bit set
Release
Detected or
LED Control
Output bit
cleared
OPERATION
DESCRIPTION
APPLICATION NOTE: The PWM frequency is determined based on the selected LED behavior, the programmed
breathe period, and the programmed min and max duty cycles. For the Direct behavior
mode, the PWM frequency is calculated based on the programmed Rise and Fall times. If
these are set at 0, the maximum PWM frequency will be used based on the programmed
duty cycle settings.
6.52
LED Pulse 1 Period Register
Table 6.74 LED Pulse 1 Period Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
84h
R/W
LED Pulse 1
Period
ST_
TRIG
P1_
PER6
P1_
PER5
P1_
PER4
P1_
PER3
P1_
PER2
P1_
PER1
P1_
PER0
20h
The LED Pulse 1 Period Register determines the overall period of a pulse operation as determined by
the LED_CTL registers (see Table 6.73 - setting 01b). Each LSB represents 32ms so that a setting of
20h (32d) would represent a period of 1024ms (32ms x 32 = 1024ms). The total range is from 32ms
to 4.06 seconds as shown in Table 6.75.
The number of pulses is programmable as determined by the PULSE1_CNT bits (see Section 6.55).
Bit 7 - ST_TRIG - Determines the start trigger for the LED Pulse behavior.
„
‘0’ (default) - The LED will Pulse when a touch is detected or the drive bit is set.
„
‘1’ - The LED will Pulse when a release is detected or the drive bit is cleared.
The Pulse 1 operation is shown in Figure 6.1 (non-inverted polarity LEDx_POL = 1) and Figure 6.2
(inverted polarity LEDx_POL = 0).
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Touch Detected
X pulses after touch
Normal – untouched
operation
(100% - Pulse 1 Min Duty Cycle) * Brightness
Normal – untouched
operation
LED
Brightness
(100% - Pulse 1 Max Duty Cycle) * Brightness
Pulse 1 Period
(P1_PER)
Figure 6.1 Pulse 1 Behavior with Touch Trigger and Non-inverted Polarity
.
Touch Detected
X pulses after touch
Pulse 1 Max Duty Cycle * Brightness
LED
Brightness
Normal – untouched
operation
Normal – untouched
operation
Pulse 1 Min Duty Cycle * Brightness
Pulse Period
(P1_PER)
Figure 6.2 Pulse 1 Behavior with Touch Trigger and Inverted Polarity
Table 6.75 LED Pulse / Breathe Period Example
SETTING
(HEX)
SETTING (DECIMAL)
TOTAL PULSE / BREATHE PERIOD
(ms)
00h
0
32
01h
1
32
02h
2
64
03h
3
96
04h
4
128
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Table 6.75 LED Pulse / Breathe Period Example (continued)
6.53
SETTING
(HEX)
SETTING (DECIMAL)
TOTAL PULSE / BREATHE PERIOD
(ms)
...
...
...
7Ch
124
3,968
7Dh
125
4,000
7Eh
126
4,032
7Fh
127
4,064
LED Pulse 2 Period Register
Table 6.76 LED Pulse 2 Period Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
85h
R/W
LED Pulse 2
Period
-
P2_
PER6
P2_
PER5
P2_
PER4
P2_
PER3
P2_
PER2
P2_
PER1
P2_
PER0
14h
The LED Pulse 2 Period Register determines the overall period of a pulse operation as determined by
the LED_CTL registers (see Table 6.73 - setting 10b). Each LSB represents 32ms so that a setting of
14h (20d) would represent a period of 640ms. The total range is from 32ms to 4.06 seconds (see
Table 6.75).
The number of pulses is programmable as determined by the PULSE2_CNT bits (see Section 6.55).
The Pulse 2 Behavior is shown in Figure 6.3 (non-inverted polarity LEDx_POL = 1) and Figure 6.4
(inverted polarity LEDx_POL = 0).
Release Detected
Touch Detected
Normal –
untouched
operation
X additional pulses after release
(100% - Pulse 2 Min Duty Cycle) *
Brightness
LED
Brightness
Normal –
untouched
operation
...
Pulse
Period
(P2_PER)
(100% - Pulse 2 Max Duty Cycle) * Brightness
Figure 6.3 Pulse 2 Behavior with Non-Inverted Polarity
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Release Detected
Touch Detected
X additional pulses after release
Normal –
untouched
operation
Normal –
untouched
operation
Pulse 2 Max Duty Cycle * Brightness
LED
Brightness
...
Pulse 2 Min Duty Cycle * Brightness
Pulse
Period
(P2_PER)
Figure 6.4 Pulse 2 Behavior with Inverted Polarity
6.54
LED Breathe Period Register
Table 6.77 LED Breathe Period Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
86h
R/W
LED Breathe
Period
-
BR_
PER6
BR_
PER5
BR_
PER4
BR_
PER3
BR_
PER2
BR_
PER1
BR_
PER0
5Dh
The LED Breathe Period Register determines the overall period of a breathe operation as determined
by the LED_CTL registers (see Table 6.73 - setting 11b). Each LSB represents 32ms so that a setting
of 14h (20d) would represent a period of 640ms. The total range is from 32ms to 4.06 seconds (see
Table 6.75).
6.55
LED Configuration Register
Table 6.78 LED Configuration Registers
ADDR
R/W
REGISTER
B7
B6
B5
88h
R/W
LED Config
-
RAMP_
ALERT
B4
B3
PULSE2_CNT[2:0]
B2
B1
B0
DEFAULT
PULSE1_CNT[2:0]
The LED Configuration Register controls the number of pulses that are sent for the Pulse 1 and Pulse
2 LED output behaviors.
Bit 6 - RAMP_ALERT - Determines whether the device will assert the ALERT pin when LEDs actuated
by the LED Output Control Register bits (see Section 6.46, "LED Output Control Registers") have
finished their respective behaviors.
„
‘0’ (default) - The ALERT pin will not be asserted when LEDs actuated by the LED Output Control
register have finished their programmed behaviors.
„
‘1’ - The ALERT pin will be asserted whenever any LED that is actuated by the LED Output Control
register has finished its programmed behavior.
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Bits 5 - 3 - PULSE2_CNT[2:0] - Determines the number of pulses used for the Pulse 2 behavior as
shown in Table 6.79. The default is 100b.
Bits 2 - 0 - PULSE1_CNT[2:0] - Determines the number of pulses used for the Pulse 1 behavior as
shown in Table 6.79.
Table 6.79 PULSE_CNT Decode
PULSEX_CNT[2:0]
6.56
2
1
0
NUMBER OF BREATHS
0
0
0
1
0
0
1
2
0
1
0
3
0
1
1
4
1
0
0
5 (default)
1
0
1
6
1
1
0
7
1
1
1
8
LED11 Configuration Register
Table 6.80 LED Configuration Registers
ADDR
R/W
REGISTER
B7
B6
8Ah
R/W
LED11 Config
-
-
B5
B4
LED11_STEPS
[1:0]
B3
VAR_
PWM
B2
B1
B0
DEFAULT
LED11_CLK[2:0]
00h
The LED11 Configuration Register controls the base frequency and number of steps for LED11.
APPLICATION NOTE: Setting in this register are ignored unless the LED11_CFG bit is set in the Configuration 2
register (see Section 6.33, "Configuration 2 Register").
Bits 5 - 4 - LED11_STEPS[1:0] - Determines the number of steps used to transition between minimum
and maximum duty cycle settings for LED11, as shown in Table 6.81.
Table 6.81 LED11_STEPS Bit Decode
LED11_STEPS[1:0]
SMSC CAP1214
1
0
NUMBER OF STEPS
0
0
256 (default)
0
1
128
1
0
64
1
1
32
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Datasheet
Bit 3 - VAR_PWM - Determines whether fixed or variable PWM frequency will be used for LED11.
„
‘0’ (default) - LED11 PWM frequency is fixed, regardless of pulse/breathe period and/or minimum
and maximum duty cycle settings.
„
‘1’ - LED11 PWM frequency is variable, based on pulse/breathe period (if behavior is not Direct)
and minimum and maximum duty cycle settings.
Bits 2 - 0 - LED11_CLK[2:0] - Determines the base clock frequency used for LED11, as shown in
Table 6.82.
APPLICATION NOTE: If the base frequency is reduced, but the number of steps is not reduced, resolution may be
lost and period lengths may be different than calculated.
Table 6.82 LED11_CLK Decode
LED11_CLK[2:0]
2
1
0
CLOCK RUNNING LED11
0
0
0
500kHz (default)
0
0
1
125kHz
0
1
0
62.5kHz
0
1
1
31.25kHz
1
0
0
15.625kHz
1
0
1
7.8125kHz
1
1
0
500kHz
1
1
1
500kHz
6.57
LED Pulse and Breathe Duty Cycle Registers
Table 6.83 LED Period and Breathe Duty Cycle Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
90h
R/W
LED Pulse 1
Duty Cycle
LED_P1_MAX_DUTY[3:0]
LED_P1_MIN_DUTY[3:0]
F0h
91h
R/W
LED Pulse 2
Duty cycle
LED_P2_MAX_DUTY[3:0]
LED_P2_MIN_DUTY[3:0]
F0h
92h
R/W
LED Breathe
Duty Cycle
LED_BR_MAX_DUTY[3:0]
LED_BR_MIN_DUTY[3:0]
F0h
93h
R/W
Direct Duty
Cycle
LED_DR_MAX_DUTY[3:0]
LED_DR_MIN_DUTY[3:0]
F0h
The LED Pulse 1, Pulse 2, Breathe, and Direct Duty Cycle Registers determine the minimum and
maximum duty cycle settings used for the LEDs for each LED behavior. These settings affect the
brightness of the LED when it is fully off and fully on.
The LED driver duty cycle will ramp up from the minimum duty cycle to the maximum duty cycle and
back down again.
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APPLICATION NOTE: When operating in Direct behavior mode, changes to the Duty Cycle settings will be applied
immediately. When operating in Breathe, Pulse 1, or Pulse 2 modes, the LED must be
unactuated and then re-actuated before changes to behavior are processed.
Bits 7 - 4 - LED_X_MAX_DUTY[3:0] - Determines the maximum PWM duty cycle for the LED drivers
as shown in Table 6.84
Bits 3 - 0 - LED_X_MIN_DUTY[3:0] - Determines the minimum PWM duty cycle for the LED drivers
as shown in Table 6.84.
Table 6.84 LED Duty Cycle Decode
X_MAX/MIN_DUTY [3:0]
3
2
1
0
MAXIMUM DUTY
CYCLE
MINIMUM DUTY
CYCLE
0
0
0
0
7%
0%
0
0
0
1
9%
7%
0
0
1
0
11%
9%
0
0
1
1
14%
11%
0
1
0
0
17%
14%
0
1
0
1
20%
17%
0
1
1
0
23%
20%
0
1
1
1
26%
23%
1
0
0
0
30%
26%
1
0
0
1
35%
30%
1
0
1
0
40%
35%
1
0
1
1
46%
40%
1
1
0
0
53%
46%
1
1
0
1
63%
53%
1
1
1
0
77%
63%
1
1
1
1
100%
77%
6.58
LED Direct Ramp Rates Register
Table 6.85 LED Direct Ramp Rates Register
ADDR
R/W
REGISTER
B7
B6
94h
R/W
LED Direct
Ramp Rates
-
-
B5
B4
B3
RISE_RATE[2:0]
B2
B1
B0
FALL_RATE[2:0]
DEFAULT
00h
The LED Direct Ramp Rates Register control the rising and falling edge time of an LED that is
configured to operate in Direct behavior mode. The rising edge time corresponds to the amount of time
the LED takes to transition from its minimum duty cycle to its maximum duty cycle. Conversely, the
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Datasheet
falling edge time corresponds to the amount of time that the LED takes to transition from its maximum
duty cycle to its minimum duty cycle.
Bits 5 - 3 - RISE_RATE[2:0] - Determines the rising edge time of an LED when it transitions from its
minimum drive state to its maximum drive state as shown in Table 6.86.
Bits 2 - 0 - FALL_RATE[2:0] - Determines the falling edge time of an LED when it transitions from its
maximum drive state to its minimum drive state as shown in Table 6.86.
Table 6.86 Rise / Fall Rate Cycle Decode
RISE/FALL_RATE [2:0]
2
1
0
RISE / FALL TIME (TRISE / TFALL)
0
0
0
0
0
0
1
250ms
0
1
0
500ms
0
1
1
750ms
1
0
0
1s
1
0
1
1.25s
1
1
0
1.5s
1
1
1
2s
6.59
LED Off Delay Register
Table 6.87 LED Off Delay Register
ADDR
R/W
REGISTER
B7
95h
R/W
LED Off Delay
Register
-
B6
B5
B4
BR_OFF_DLY [2:0]
B3
-
B2
B1
B0
DIR_OFF_DLY [2:0]
DEFAULT
00h
The LED Off Delay Register determines off delays for the LED Direct and Breathe behaviors.
Bits 6 - 4 - BR_OFF_DLY[2:0] - Determines the Breathe behavior mode off delay, which is the amount
of time an LED in Breathe behavior mode remains inactive after it finishes a breathe pulse (ramp on
and ramp off), as shown in Figure 6.5 (non-inverted polarity LEDx_POL = 1) and Figure 6.6 (inverted
polarity LEDx_POL = 0). Available settings are shown in Table 6.88.
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
LED Actuated
LED Unactuated
100% - Breathe Max Min Cycle * Brightness
LED
Brightness
Breathe
Period
(BR_PER)
100% - Breathe Min Duty Cycle *
Brightness
Breathe Off
Delay
(BR_OFF_DLY)
Figure 6.5 Breathe Behavior with Non-Inverted Polarity
LED Actuated
LED Unactuated
Breathe Max Duty Cycle * Brightness
LED
Brightness
Breathe Min Duty Cycle * Brightness
Breathe
Period
(BR_PER)
Breathe Off
Delay
(BR_OFF_DLY)
Figure 6.6 Breathe Behavior with Inverted Polarity
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Datasheet
Table 6.88 Breathe Off Delay Settings
BR_OFF_DLY [2:0
2
1
0
OFF DELAY
0
0
0
0 (default)
0
0
1
0.25s
0
1
0
0.5s
0
1
1
0.75s
1
0
0
1.0s
1
0
1
1.25s
1
1
0
1.5s
1
1
1
2.0s
Bits 2 - 0 - DIR_OFF_DLY[2:0] - Determines the Direct behavior mode turn-off delay, which is the
amount of time an LED in Direct behavior mode remains active after it is no longer actuated (such as
after a release has been detected or the drive state has been changed). Available settings are shown
in Table 6.89.
Table 6.89 Direct Off Delay Settings
DIR_OFF_DLY [2:0
2
1
0
OFF DELAY
TOFF_DLY
0
0
0
0 (default)
0
0
1
0.5s
0
1
0
1.0s
0
1
1
1.5s
1
0
0
2.0s
1
0
1
3.0s
1
1
0
4.0s
1
1
1
5.0s
The Direct behavior operation is determined by the combination of programmed Rise Time, Fall Time,
and Off Delay as shown in Figure 6.7 (non-inverted polarity LEDx_POL = 1) and Figure 6.8 (inverted
polarity LEDx_POL = 0).
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Datasheet
Normal –
untouched
operation
Release
Detected
Touch
Detected
Normal –
untouched
operation
(100% - Min Duty Cycle) *
Brightness
LED
Brightness
(100% - Max Duty
Cycle) * Brightness
RISE_RATE
Setting (tRISE)
Off Delay
(tOFF_DLY)
FALL_RATE
Setting (tFALL)
Figure 6.7 Direct Behavior for Non-Inverted Polarity
Release
Detected
Touch
Detected
LED
Brightness
Max Duty Cycle * Brightness
Normal –
untouched
operation
Normal –
untouched
operation
Min Duty Cycle * Brightness
RISE_RATE
Setting (tRISE)
FALL_RATE
Setting (tFALL)
Off Delay
(tOFF_DLY)
Figure 6.8 Direct Behavior for Inverted Polarity
6.60
Sensor Calibration Registers
Table 6.90 Sensor Calibration Registers
ADDR
REGISTER
R/W
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
B1h
Sensor 1
Calibration
R
CAL1_9
CAL1_8
CAL1_7
CAL1_6
CAL1_5
CAL1_4
CAL1_3
CAL1_2
00h
B2h
Sensor 2
Calibration
R
CAL2_9
CAL2_8
CAL2_7
CAL2_6
CAL2_5
CAL2_4
CAL2_3
CAL2_2
00h
B3h
Sensor 3
Calibration
R
CAL3_9
CAL3_8
CAL3_7
CAL3_6
CAL3_5
CAL3_4
CAL3_3
CAL3_2
00h
B4h
Sensor 4
Calibration
R
CAL4_9
CAL4_8
CAL4_7
CAL4_6
CAL4_5
CAL4_4
CAL4_3
CAL4_2
00h
B5h
Sensor 5
Calibration
R
CAL5_9
CAL5_8
CAL5_7
CAL5_6
CAL5_5
CAL5_4
CAL5_3
CAL5_2
00h
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 6.90 Sensor Calibration Registers (continued)
ADDR
REGISTER
R/W
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
B6h
Sensor 6
Calibration
R
CAL6_9
CAL6_8
CAL6_7
CAL6_6
CAL6_5
CAL6_4
CAL6_3
CAL6_2
00h
B7h
Sensor 7
Calibration
R
CAL7_9
CAL7_8
CAL7_7
CAL7_6
CAL7_5
CAL7_4
CAL7_3
CAL7_2
00h
B8h
Sensor 8
Calibration
R
CAL8_9
CAL8_8
CAL8_7
CAL8_6
CAL8_5
CAL8_4
CAL8_3
CAL8_2
00h
B9h
Sensor 9
Calibration
R
CAL9_9
CAL9_8
CAL9_7
CAL9_6
CAL9_5
CAL9_4
CAL9_3
CAL9_2
00h
BAh
Sensor 10
Calibration
R
CAL10_
9
CAL10_
8
CAL10_
7
CAL10_
6
CAL10_
5
CAL10_
4
CAL10_
3
CAL10_
2
00h
BBh
Sensor 11
Calibration
R
CAL11_
9
CAL11_
8
CAL11_
7
CAL11_6
CAL11_
5
CAL11_
4
CAL11_
3
CAL11_
2
00h
BCh
Sensor 12
Calibration
R
CAL12_
9
CAL12_
8
CAL12_
7
CAL12_
6
CAL12_
5
CAL12_
4
CAL12_
3
CAL1_2
2
00h
BDh
Sensor 13
Calibration
R
CAL13_
9
CAL13_
8
CAL13_
7
CAL13_
6
CAL13_
5
CAL13_
4
CAL13_
3
CAL13_
2
00h
BEh
Sensor 14
Calibration
R
CAL14_
9
CAL14_
8
CAL14_
7
CAL14_
6
CAL14_
5
CAL14_
4
CAL14_
3
CAL14_
2
00h
D0h
Sensor 1
Calibration
Low byte
R
CAL4_1
CAL4_0
CAL3_1
CAL3_0
CAL2_1
CAL2_0
CAL1_1
CAL1_0
00h
D1h
Sensor 5
Calibration
Low bye
R
CAL8_1
CAL8_0
CAL7_1
CAL7_0
CAL6_1
CAL6_0
CAL5_1
CAL5_0
00h
D2h
Sensor 9
Calibration
Low bye
R
CAL12_
1
CAL12_
0
CAL11_
1
CAL11_0
CAL10_
1
CAL10_
0
CAL9_1
CAL9_0
00h
D3h
Sensor 13
Calibration
Low bye
R
-
-
-
-
CAL14_
1
CAL14_
0
CAL13_
1
CAL13_
0
00h
The Sensor Calibration Registers hold the 10-bit value that is used for the analog block when each
sensor is selected. These registers are read only. They are updated automatically by the digital block
when the analog re-calibration routine is performed.
These bits are cleared when the device is placed into Standby or Deep Sleep for all channels that are
not sampled.
6.61
Product ID Register
Table 6.91 Product ID Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
FDh
R
Product ID
0
1
0
1
1
0
1
0
5Ah
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
The Product ID Register stores a unique 8-bit value that identifies the device.
6.62
Revision Register
Table 6.92 Revision Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
FFh
R
Revision
1
0
0
0
0
0
0
0
80h
The Revision Register stores an 8-bit value that represents the part revision.
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Chapter 7 Package Information
7.1
Package Drawings
Figure 7.1 Package Diagram - 32-Pin QFN
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Figure 7.2 Package Dimensions - 32-Pin QFN
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Datasheet
Figure 7.3 Package PCB Land Pattern and Stencil
Figure 7.4 Package Detail A - Stencil Opening and Perimeter Lands
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Figure 7.5 Package Detail B - Thermal Vias and Stencil Opening
Figure 7.6 Package Land Pattern Dimensions
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
7.2
Package Marking
All packages will marked as shown in Figure 7.7.
MINIMUM CIRCLE “R”
DIAMETER = 0.80mm
TOP
0.4
R
Line 1 – SMSC Logo
Line 2 – Device Number, Version
Line 3 - Revision, Year, Week, 4-digit Engineering Code (RYYWWXXXX)
Line 4 – Lot Number
C A P 1 2 1 4
- V
4x 1.3PT
R Y Y W W X X X X
8 H 1 2 3 4 5 6 a
Line 5 – Vendor ID and Country Code (VV – CC)
V V - C C
PIN 1
e3
LINES 1, 2, 3, & 4: CENTER
HORIZONTAL ALIGNMENT
PB-FREE/GREEN SYMBOL
(Matte Sn)
LINES 5: BEST FIT BETWEEN
PIN 1 MARK AND Pb-FREE SYMBOL
BOTTOM
BOTTOM MARKING NOT ALLOWED
Figure 7.7 Package Markings
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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Chapter 8 Datasheet Revision History
Table 8.1 Customer Revision History
REVISION LEVEL & DATE
Rev. 1.0 (08-30-10)
SMSC CAP1214
SECTION/FIGURE/ENTRY
CORRECTION
Document release
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DATASHEET
Revision 1.0 (08-30-10)