FT5x26

FT5x26
True Multi-Touch
Capacitive Touch Panel Controller
INTRODUCTION
The FT5X26 is single-chip capacitive touch panel controllers with built-in enhanced Micro-controller unit
(MCU). Itprovides the benefits of full screen common mode scan technology,fast response time and high
level of accuracy.It can drive capacitive type touch panel with up to 35 driving and 21 sensing lines.
FEATURES
 Mutual Capacitive Sensing Techniques
 5426DQ8 Supports up to 28TX + 16 RX
 5526EEZ Supports up to 35TX + 21 RX
 Support up to 10 fingers
 High immunity to inductive power noise
 Automatic mode switching (Active, Monitor,Sleep)
 Support >100Hz sampling rate
 Auto-calibration
 Support IIC (up to 400kbits/sec) interface
 Power
 2.7 to 3.6V Operating Voltage
 IOVCC supports from 1.8V to 3.6V
 Built-in 64KB Flash
 Single Channel(TX or RX)resistance:Up to100K Ω
 Single Channel (transmit / receive) Capacitance: 40pF
 12-Bit ADC Accuracy
 Features “short I/O ” testing for sense pins
 Supports various type of panels with no ground shielding layer
 3 OperatingModes
 Active
 Monitor
 Sleep
 Operating Temperature Range: -40°C to +85°C
 Package:
 QFN56L 6x6x0.6mm, 0.35mm/pitch
 QFN68L 8x8x0.8mm, 0.4mm/pitch
FocalTech Systems Co., Ltd·www.focaltech-systems.com·[email protected]
Document Number: D-FT5X26-DataSheet-V1.1
F-OI-RD01-03-03-B
TABLE OF CONTENTS
INTRODUCTION ........................................................................................................................................................... I FEATURES .................................................................................................................................................................... I 1 OVERVIEW ........................................................................................................................................................... 3 1.1 2 FUNCTIONAL DESCRIPTION ........................................................................................................................... 3 2.1 2.2 2.3 2.4 2.5 3 TYPICAL APPLICATIONS ................................................................................................................................... 3 ARCHITECTURAL OVERVIEW ........................................................................................................................... 3 MCU ................................................................................................................................................................ 4 OPERATION MODES ........................................................................................................................................ 4 HOST INTERFACE ............................................................................................................................................ 5 SERIAL INTERFACE .......................................................................................................................................... 5 ELECTRICAL SPECIFICATIONS ..................................................................................................................... 6 3.1 3.2 3.3 3.4 3.5 ABSOLUTE MAXIMUM RATINGS ....................................................................................................................... 6 DC CHARACTERISTICS .................................................................................................................................... 7 AC CHARACTERISTICS .................................................................................................................................... 7 I/OPORTSCIRCUITS......................................................................................................................................... 8 POWER ON/RESET SEQUENCE ................................................................................................................... 8 4 PIN CONFIGURATIONS ................................................................................................................................... 10 5 PACKAGE INFORMATION ............................................................................................................................... 13 5.1 5.2 5.3 PACKAGE INFORMATION OF QFN-6X6-56L PACKAGE................................................................................. 13 PACKAGE INFORMATION OF QFN-8X8-68L PACKAGE................................................................................. 14 ORDERING INFORMATION .............................................................................................................................. 16 THIS DOCUMENT CONTAINS INFORMATION PROPRIETARY TO FOCALTECH SYSTEMS CO.,LTD., AND MAY NOT BE
REPRODUCED, DISCLOSED OR USED IN WHOLE OR PART WITHOUT THE EXPRESS WRITTEN PERMISSION OF
FOCALTECH SYSTEMS CO.,LTD.
Copyright © 2014, FocalTech Systems CO.,Ltd .All rights reserved Version1.1︱Page2 of 17
1
OVERVIEW
1.1
Typical Applications
FT5X26 accommodates a wide range of applications with a set of buttons up to a 2D touch sensing device.
It ‘s powerful design for below applications.






Tablets
Navigation systems, GPS
Game consoles
POS (Point of Sales) devices
Portable MP3 and MP4 media players
Digital cameras
FT5X26 supportTouch Panel, the spec is listed in the following table,
Part Number
FT5426DQ8
FT5526EEZ
2
2.1
Package
QFN56L6x6x0.6mm
Pitch =0.35mm
QFN 68L8x8x0.8mm
Pitch =0.4mm
TX
RX
Total
Channels
28
16
44
35
21
56
Recommended for
Tablet
TP Size (16:9)
≦8”,
Sensor Pitch:6.4mm
≦10.1”,
Sensor Pitch:6.4mm
FUNCTIONAL DESCRIPTION
Architectural Overview
Figure2-1 shows the overall architecture for theFT5X26.
Figure 2-1 SystemArchitecture Diagram
The FT5X26 is comprised of five main functional parts listed below,
 Touch Panel Interface Circuits
The main function for the AFE and AFE controller is to interface with the touch panel. It scans the panel by
sending AC signals to the panel and processes the received signals from the panel. It includes both Transmit
(TX) and Receive (RX) functions. Key parameters to configure this circuit can be sent via serial interfaces.
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 Enhanced MCU with DSP accelerator
For the Enhanced MCU, larger program and data memories are supported. Furthermore, a Flash memory is
implemented to store programs and some key parameters.
Complex signal processing algorithms are implemented by MCU and DSP accelerator to detect the touches
reliably and efficiently. Communication protocol software is also implemented in this MCU to exchange data
and control information with the host processor.
 External Interface
 I2C: an interface for data exchange with host
 INT: an interrupt signal to inform the host processor that touch data is ready for read
 RSTN: an external low signal reset the chip. The port is also use to wakeup the FT5X26 from the
Sleep mode.
 A watch dog timer is implemented to ensure the robustness of the chip.
 A voltage regulator to generate 1.8V for digital circuits from the input VDD3 supply
 Power On Reset (POR) is active until VDDD is higher than some level and hold decades of μs.
2.2
MCU
This section describes some critical features and operations supported by the enhanced MCU.
Figure 2-2 shows the overall structure of the MCU block. In addition to the enhanced MCU core, we have
added the following circuits,
 A DSP accelerator cooperates with MCU to process the complex algorithms
 Timer: A number of timers are available to generate different clocks
 Clock Manager: To control various clocks under different operation conditions of the system
Figure 2-2 MCUBlock Diagram
2.3
Operation Modes
FT5X26 offers following three modes:
 Active Mode
When in this mode, FT5X26 actively scans the panel. The default scan rate is 100 frames per second. The
host processor can configure it to speed up or to slow down.
 Monitor Mode
In this mode, FT5X26 scans the panel at a reduced speed. The default scan rate is 25 frames per second
and the host processor can increase or decrease this rate. In this mode, most algorithms are stopped. A
simpler algorithm is being executed to determine if there is a touch or not. When a touch is detected, FT5X26
shall enter the Active mode immediately to acquire the touch information quickly. During this mode, the serial
port is closed and no data shall be transferred with the host processor.
 Sleep Mode
In this mode, the chip is set in a power down mode. It shall only respond to the “RESET” signal from the host
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processor. The chip therefore consumes very little current, which help prolong the standby time for the
portable devices.
2.4
Host Interface
Figure 2-3shows the interface between a host processor and FT5X26. This interface consists of the following
three sets of signals:
 Serial Interface
 Interrupt from FT5X26 to the Host
 Reset Signal from the Host to FT5X26
Figure 2-3 HostInterface Diagram
The serial interfaceofFT5X26 is I2C. The detail of the interface is described in detail in Section 2.5. The
interrupt signal (/INT) is used for FT5X26 to inform the host that data are ready for the host to receive. The
/RST signal is used for the host to wake up FT5X26 from the Sleep mode. After resetting, FT5X26 shall enter
the Active mode.
2.5
Serial Interface
FT5X26 supports the I2C interfaces, which can be used by a host processor or other devices.
The I2C is always configured in the Slave mode. The data transfer format is shown in Figure 2-4.
Figure 2-4 I2C Serial Data Transfer Format
Figure 2-5I2C master write, slave read
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Figure 2-6 I2C master read, slave write
Table 2-1 lists the meanings of the mnemonics used in the above figures.
Table 2-1Mnemonics Description
Mnemonics
S
Description
I2C Start or I2C Restart
A[6:0]
Slave address
R/ W
READ/WRITE bit, ‘1’ for read, ‘0’for write
A(N)
ACK(NACK) bit
P
STOP: the indication of the end of a packet (if this bit is missing, S will indicate the
end of the current packet and the beginning of the next packet)
I2C Interface Timing Characteristics is shown in Table 2-2.
Table 2-2 I2C Timing Characteristics
Parameter
3
Min
Max
Unit
SCL frequency
0
Bus free time between a STOP and START condition
1.3
us
Hold time (repeated) START condition
0.6
us
Data setup time
100
ns
Setup time for a repeated START condition
0.6
us
Setup Time for STOP condition
0.6
us
400
KHz
ELECTRICAL SPECIFICATIONS
3.1
Absolute Maximum Ratings
Table 3-1 Absolute Maximum Ratings
Item
Symbol
Value
Unit
Note
Power Supply Voltage
VDD3 – VSSLF
2.7 ~ +3.6
V
1, 3
I/O Digital Voltage
IOVCC
1.8~ +3.6
V
1
Operating Temperature
Topr
-40 ~ +85
℃
1
Storage Temperature
Tstg
-55 ~ +150
℃
1
Notes
1. If used beyond the absolute maximum ratings, FT5X26 may be permanently damaged. It is strongly
recommended that the device be used within the electrical characteristics in normal operations. If exposed to
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the condition not within the electrical characteristics, it may affect the reliability of the device.
2. Make sure VDD3 (high) ≥VSSLF (low)
3.2
DC Characteristics
Table 3-2DC Characteristics
Item
Symbol
Unit
Input high-level voltage
VIH
Input low -level voltage
Test Condition
Min.
Typ.
Max.
V
0.7 x IOVCC
--
IOVCC
VIL
V
-0.3
--
0.3 x IOVCC
Output high -level voltage
VOH
V
IOH=-0.1mA
0.7 x IOVCC
--
--
Output low -level voltage
VOL
V
IOH=0.1mA
--
--
0.3 x IOVCC
I/O leakage current
ILI
uA
Vin=0~VDD3
-1
--
1
Current consumption
（Normal operation mode）
Iopr
mA
--
12.76
--
Current consumption
（Monitor mode）
Imon
mA
Current consumption
（Sleep mode）
Islp
uA
Step-up output voltage
VDD5
V
Power Supply voltage
VDD3
V
VDD3 = 2.8V
Ta=25℃
MCLK=24MHz
VDD3 = 2.8V
Ta=25℃
MCLK=24MHz
VDD3 = 2.8V
Ta=25℃
MCLK=24MHz
Note
0.43
--
-42
--
--
VDD3= 2.8V
0.25
2.7
--
3.6
Notes: This consumption data is intended for design guidance only. Actual current will depend on the particular sensor design and firmware options.
3.3
AC Characteristics
AC Characteristics of Oscillators
Item
OSC clock 1
Symbol
fosc1
Unit
MHz
Test Condition
VDD3 = 2.8V; Ta=25℃
Min.
Typ.
Max.
49
50
51
Note
Table 3-3 AC Characteristics of TX &RX
Item
Symbol
Test Condition
Min
Typ
Max
Unit
TX acceptable clock
ftx
50
150
400
TX output rise time
Ttxr
--
210
--
nS
TX output fall time
Ttxf
--
210
--
nS
RX input voltage
Trxi
1.2
--
1.6
V
Note
KHz
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3.4
I/OPortsCircuits
Figure 3-1General PurposeIn/Out Port Circuit.
The input/output property can be configured via firmware setting. The firmware can also control its output
behavior as push-pull or as open-drain that SDA of I2C interface is required.
Figure 3-2 Reset Input Port Circuits
3.5
POWER ON/Reset Sequence
Reset should be pulled down to be low before powering on and powering down. I2C shouldn’t be used by
other devices during Reset time after VDD powering on (Trtp). INT signal will be sent to the host after initializing all parameters and then start to report points to the host. If Power is down, the voltage of supply must
be below 0.3V and Tpdt is more than 1ms.
Tris
Power
Figure 3-3 Power on time
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Tpdt
Power
0.3V
Figure 3-4 Power Cycle requirement
Trtp
Tvdr
Tvdr
Tpon
VDD
Reset
INT
I2C
Figure 3-5 Power on Sequence
Reset time must be enough to guarantee reliable reset, the time of starting to report point after resetting
approach to the time of starting to report point after powering on.
Trsi
Trst
Power
RESET
INT
I2C
Figure 3-6 Reset Sequence
Table 3-5Power on/Reset Sequence Parameters
Parameter
Tris
Description
Rise time from 0.1VDD to 0.9VDD
Min
Max
Units
--
5
ms
Tpdt
Time of the voltage of supply being below 0.3V
5
--
ms
Trtp
Time of resetting to be low before powering on
100
--
μs
Tpon
Time of starting to report point after powering on
--
200
ms
Tvdr
Reset time after VDD powering on
1
--
ms
Trsi
Time of starting to report point after resetting
--
200
ms
Trst
Reset time
1
--
ms
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4
PIN CONFIGURATIONS
Pin List of FT5X26
Table 4-1 Pin Definition
Name
Pin No.
FT5426
FT5526
Type
Description
RX21
68
I
Receiver input pins
RX20
67
I
Receiver input pins
RX19
66
I
Receiver input pins
RX18
65
I
Receiver input pins
RX17
64
I
Receiver input pins
RX16
54
63
I
Receiver input pins
RX15
53
62
I
Receiver input pins
RX14
52
61
I
Receiver input pins
RX13
51
60
I
Receiver input pins
RX12
50
59
I
Receiver input pins
RX11
49
58
I
Receiver input pins
RX10
48
57
I
Receiver input pins
RX9
47
56
I
Receiver input pins
RX8
46
55
I
Receiver input pins
RX7
45
54
I
Receiver input pins
RX6
44
53
I
Receiver input pins
RX5
43
52
I
Receiver input pins
RX4
42
51
I
Receiver input pins
RX3
41
50
I
Receiver input pins
RX2
40
49
I
Receiver input pins
RX1
39
48
I
VDD5_IN
55
1
PWR
Receiver input pins
internal generated 5V power supply,
A 1μF ceramic capacitor to ground
is required.
VSSLF
57
69
PWR
VDD5_Out
56
2
PWR
Analog ground
digital
power
supply,
A
1μF
ceramiccapacitor to ground is required.
TX10
27
36
O
Transmit output pin
TX11
28
37
O
Transmit output pin
TX12
29
38
O
Transmit output pin
TX13
30
39
O
Transmit output pin
TX14
31
40
O
Transmit output pin
TX15
32
41
O
Transmit output pin
TX16
33
42
O
Transmit output pin
TX17
34
43
O
Transmit output pin
TX18
35
44
O
Transmit output pin
TX19
36
45
O
Transmit output pin
TX20
37
46
O
Transmit output pin
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TX21
38
47
O
Transmit output pin
TX22
1
3
O
Transmit output pin
TX23
2
4
O
Transmit output pin
TX24
3
5
O
Transmit output pin
TX25
4
6
O
Transmit output pin
TX26
5
7
O
Transmit output pin
TX27
6
8
O
Transmit output pin
TX28
7
9
O
Transmit output pin
TX29
10
O
Transmit output pin
TX30
11
O
Transmit output pin
TX31
12
O
Transmit output pin
TX32
13
O
Transmit output pin
TX33
14
O
Transmit output pin
TX34
15
O
Transmit output pin
TX35
16
O
Transmit output pin
digital
VDD10
8
17
PWR
power
supply,
A
1μF
ceramiccapacitor to ground is required.
digital
VDD3
9
18
PWR
power
supply,
A
1μF
ceramiccapacitor to ground is required.
digital
VDD15
10
19
PWR
power
supply,
A
1μF
ceramiccapacitor to ground is required.
digital
VDD18
11
20
PWR
power
supply,
A
1μF
ceramiccapacitor to ground is required.
IOVCC
12
21
PWR
I/O power supply
INT
13
22
I/O
GPIO1
14
23
I/O
SDA
15
24
I/O
I2C data input and output
I2C clock input
Interrupt request to the host, or
Wakeup request from the host.
SCL
16
25
I/O
RSTN
17
26
I
External Reset, Low is active
TX1
18
27
O
Transmit output pin
TX2
19
28
O
Transmit output pin
TX3
20
29
O
Transmit output pin
TX4
21
30
O
Transmit output pin
TX5
22
31
O
Transmit output pin
TX6
23
32
O
Transmit output pin
TX7
24
33
O
Transmit output pin
TX8
25
34
O
Transmit output pin
TX9
26
35
O
Transmit output pin
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FT5426DQ8Package Diagram
FT5526EEZPackage Diagram
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5
5.1
PACKAGE INFORMATION
Package Information of QFN-6x6-56L Package
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Item
Symbol
Millimeter
Type
Max
A
A1
A2
A3
0.5
0
----
b
0.13
0.18
0.23
b1
0.07
0.12
0.17
Co Planarity
Lead Offset
D
E
e
J
K
L
R
aaa
bbb
ccc
ddd
6 BSC
6 BSC
0.35 BSC
3.9
4
3.9
4
0.35
0.4
1.45
1.55
0.1
0.1
0.08
0.1
Exposed Pad Offset
eee
Total Thickness
Stand Off
Mold Thickness
L/F Thickness
Lead Width
Body Size
X
Y
Lead Pitch
EP Size
Lead Length
Package Edge Tolerance
Mold Flatness
5.2
Min
X
Y
0.55
0.6
0.035
0.05
0.4
---0.152 REF
4.1
4.1
0.45
1.65
0.1
Package Information of QFN-8x8-68L Package
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Item
Symbol
A
Total Thickness
Stand Off
Mold Thickness
L/F Thickness
Lead Width
Lead Length
Package Edge Tolerance
Mold Flatness
A1
A2
A3
b
D
E
e
J
K
L
aaa
bbb
Co Planarity
Lead Offset
ccc
ddd
Exposed Pad Offset
eee
Body Size
X
Y
Lead Pitch
EP Size
X
Y
Min
0.7
0
---0.15
6.1
6.1
0.35
Millimeter
Type
Max
0.75
0.8
0.035
0.55
0.203 REF
0.2
8 BSC
8 BSC
0.4 BSC
6.2
6.2
0.4
0.1
0.1
0.08
0.05
0.57
0.25
6.3
6.3
0.45
0.1
0.1
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5.3
Ordering Information
QFN
Package Type
56Pin(6 * 6)/68Pin(8 * 8)
56Pin(0.6 – P0.35)/68Pin(0.8 – P0.4)
Product Name
FT5426 FT5526
Note:
1). The last three letters in the product name indicate the package type , lead pitch and thickness and numbers of TX and RX.
2). The third last letter indicates the package type .
D: QFN-6*6
E : QFN-8*8
3). The second last letter indicates the lead pitch and thickness.
Q: 0.6 - P0.35
E : 0.8 - P0.4
4). The last letter indicates the numbers of TX and RX.
8: 28TX-16RX
Z: 35TX-21RX
T: Track Code
Date Code :
Code 1~6 : (Serial Code, tracking)
FT5X26
TFYWWSV
Code 7 : (Version Code, IC version)
Product Name
Package Type
# TX Pins
# RX Pins
FT5426DQ8
QFN-56L
28
16
FT5526EEZ
QFN-68L
35
21
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Appendix: IC Revision history of FT5X26 Specification
Version
Change Items
Effective Date
0.01
1st Preliminary
27-Jun-14
0.02
1.0
1.1
Updated Table 3-2DC Characteristics
1.Removed Hibernation
2.updated Tpon<=200ms
3.updated Trsi<=200ms
4.updatedI2C Timing Characteristics
Update the pin definition of FT5426
10-Aug-14
23-Sept-14
12-Nov-14
END OF DATASHEET
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