Eval Board

IS31SE5104 4-CH CAPACITIVE TOUCH SENSOR EVALUATION BOARD GUIDE
DESCRIPTION
RECOMMENDED EQUIPMENT
The IS31SE5104 is an ultra low power, fully integrated
solution for capacitive touch applications with up to 4
surfaces. The chip allows electrodes to project sense
fields through any dielectric such as glass or plastic.
On-chip calibration logic continuously monitors the
environment and automatically adjusts on-and-off
threshold levels to prevent false sensor activation.

The IS31SE5104 is fully programmable via a 400kHz
I2C serial bus protocol.
5.0V, 500mA power supply
ABSOLUTE MAXIMUM RATINGS

≤ 5.5V power supply
Caution: Do not exceed the conditions listed above, otherwise
the board will be damaged.
PROCEDURE
FEATURES









Supply voltage from 2.7V to 5.5V
I2C interface, 1.8V/2.8V is allowed
Auto offset compensation
Fully integrated sense controller with 4 capacitive
touch inputs
Interrupt driven output
Adjustable sensitivity with external capacitor or by
internal register
Low power consumption
ESD HBM 8kV
IC controller in QFN-16 (3mm × 3mm)
The IS31SE5104 evaluation board is fully assembled
and tested. Follow the steps listed below to verify
board operation.
Caution: Do not turn on the power supply until all connections
are completed.
1)
2)
Connect the ground lead of the power supply to
the EVB GND terminal and the positive lead to the
EVB VCC terminal. Or use the connector (DC IN)
with a power adaptor: jack size 3.5mm x 1.35mm.
Turn on the power supply and pay attention to the
supply current. If the current exceeds 100mA,
please check for a circuit fault.
EVALUATION BOARD OPERATION
QUICK START
This evaluation board is controlled
pre-programmed P89LPC922 (80C51 core).
by
a
IS31SE5104 evaluation board has 4 touch surfaces
designed on a 2mm thick acrylic board to induce a
dielectric. Each touch surface has an associated LED
that will light when the corresponding surface area is
touched.
CBODY
LED
CPCB
IS31SE5104
Figure 2: Capacitance Detection
Figure 1: Photo of IS31SE5104 Evaluation Board
The capacitance (CBODY) of an approaching finger
increases as it approaches the sense area. The
IS31SE5104 detects this increase in capacitance and
turns on the associated LED.
SOFTWARE SUPPORT
Please refer to the integrated program.
Please refer to the datasheet for more information.
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 11/19/2014
1
IS31SE5104 4-CH CAPACITIVE TOUCH SENSOR EVALUATION BOARD GUIDE
ORDERING INFORMATION
Part No.
Temperature Range
Package
IS31SE5104-QFLS2-EB
-40°C ~ +85°C (Industrial)
QFN-16, Lead-free
Table 1: Ordering Information
For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing team at
[email protected] or (408) 969-6600.
U2
3V
U3
VCC
CON1
DC IN
EXT
1
SDA
SCL
SDB
20
19
18
10
14
3V
1
TP2
C1
10uF
VDD
3
C3
1uF
5
SD
2
TP1
VOUT
C5
1uF
C4
10nF
GND
BP
4
P0.0/CMP2/KBI0
VDD
P0.1/CIN2B/KBI1
P0.2/CIN2A/KBI2
P0.3/CIN1B/KBI3 P0.4/CIN1A/KBI4
P1.2/T0/SCL
P0.5/CMPREF/KBI5
P0.6/CMP1/KBI6
P0.7/T1/KBI7
P1.0/TXD
P1.1/RXD
P1.5/RST
C6
15
0.1uF
TP3
17
16
13
12
11
4
P0.4
P0.5
3V
P0.5
P0.4
RST
GND
TXD
RXD
RST
5
4
3
2
1
ICP
LDO
TP5
SDB
SCL
SDA
INT
GND
JP1
OPEN=EXT CTRL
EXT
9
5
4
3
2
1
3
2
P1.3/INT0/SDA
P1.6
P1.7
P3.1/XTAL1
P1.4/INT1
P3.0XTAL2/CLKOUT
VSS
6
8
7
RXD
INT
TXD
1
2
3
5
TP4
LPC922
VCC
R4 R1 R3 R2
10K 10K 4.7K 4.7K
U1
IS31SE5104
VCC
1
VCC
C2
0.1uF
14
16
KEY PAD
R5
KEY1
2
SD
INTB
SDA
SCL
AD
10
9
8
6
7
VCC
SDB
INT
SDA
SCL
D4
D3
D2
D1
GND
GND
Cap1
510
R6
KEY2
3
Cap2
510
R7
KEY3
OUT4
4
Cap3
510
OUT3
OUT2
R8
KEY4
5
Cap4
510
C10
NC
C9
NC
C8
NC
OUT1
15
R16
13
R15
12
R14
11
R13
1K
C7
NC
Figure 3: IS31SE5104 Application Schematic
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 11/19/2014
2
IS31SE5104 4-CH CAPACITIVE TOUCH SENSOR EVALUATION BOARD GUIDE
BILL OF MATERIALS
Name
Symbol
Touch Sensor
U1
MCU
Description
Qty.
Supplier
Part No.
Capacitive touch sensor
1
ISSI
IS31SE5104
U2
Microcontroller
1
NXP
LPC922
LDO
U3
Low-dropout regulator
1
PAM
PAM3101
LED
D1~D4
Diode, LED blue, SMD
4
Everlight
19-217/BHC-ZL1M2RY
/3T
Resistor
R1,R4
RES,10k,1/16W,±5%,SMD
2
YAGEO
RC0603FR-0710KL
Resistor
R2,R3
RES,4.7k,1/16W,±5%,SMD
2
YAGEO
RC0603FR-074K7L
Resistor
R5~R8
RES,510,1/16W,±5%,SMD
4
YAGEO
RC0603FR-07510RL
Resistor
R13~R16
RES,1k,1/16W,±5%,SMD
4
YAGEO
RC0603FR-071KL
Capacitor
C1
CAP,10µF,16V,±20%,SMD
1
YAGEO
CC0805JKX7R6BB106
Capacitor
C2, C6
CAP, 0.1µF,16V,±20%,SMD
2
YAGEO
CC0603JKX7R9BB104
Capacitor
C3, C5
CAP, 1µF,16V,±20%,SMD
2
YAGEO
CC0805JKX7R9BB105
Capacitor
C4
CAP,10nF,16V,±20%,SMD
1
YAGEO
CC0603JKX7R9BB103
Capacitor
C7~C10
Not Connect
4
Bill of Materials, refer to Figure 3 above.
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 11/19/2014
3
IS31SE5104 4-CH CAPACITIVE TOUCH SENSOR EVALUATION BOARD GUIDE
Figure 4: Board Component Placement Guide - Top Layer
Figure 5: Board PCB Layout - Top Layer
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 11/19/2014
4
IS31SE5104 4-CH CAPACITIVE TOUCH SENSOR EVALUATION BOARD GUIDE
Figure 6: Board Component Placement Guide - Bottom Layer
Figure 7: Board PCB Layout - Bottom Layer
Copyright © 2014 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its
products at any time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services
described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information
and before placing orders for products.
Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction
of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness.
Products are not authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction,
that:
a.) the risk of injury or damage has been minimized;
b.) the user assume all such risks; and
c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 11/19/2014
5