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FTS_AN_CTPM_Standard(FTS_AN_CTPM_Standard_eng).pdf
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Application Note for CTPM
Touch panel
[Document ref]
0.8
18 Aug 2010
Xiaoxu Du
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[Distribution list]
Application Note for CTPM
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This document contains information proprietary to FocalTech Systems, Ltd., and may not be reproduced,
disclosed or used in whole or part without the express written permission of FocalTech Systems, Ltd.
Copyright © 2010, FocalTech Systems, Ltd
All rights reserved
R3-B4-A, South Area, Shenzhen Hi-Tech Industrial Park,
Shenzhen, Gungdong, P.R. China
ZIP :518057
T +86 755 26588222
F +86 755 26712499
E support@focaltech-systems.com
www.focaltech-systems.com
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CTPM Application Note
Revision History
Date
18 Jan, 2010
17 Mar,2010
22 Mar,2010
26 Mar,2010
08 May,2010
07 Jul, 2010
18 Aug, 2010
22 Dec, 2010
Version List of changes
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
Initial draft
Add raw data protocol
Add system information protocol
Add calibration related parameters
Add information to operating mode
Change Protocol and add information
Modified to release version
Modify explanation for register 0xA4
Author + Signature
Xiaoxu Du
Xiaoxu Du
Xiaoxu Du
Xiaoxu Du
Xinming Wang
Yunfeng Yuan
Xiaoxu Du
Xiaoxu Du
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CTPM Application Note
Table of Contents
I2C Interface .................................................................................................................................... 2
1
1.1 CTPM interface to Host .................................................................................................................. 2
I2C Read/Write Interface description .............................................................................................. 2
1.2
1.3
Interrupt signal from CTPM to Host ............................................................................................... 3
1.4 Wakeup signal from Host to CTPM ................................................................................................ 4
2
CTP Register Mapping .................................................................................................................... 4
2.1 Operating Mode .............................................................................................................................. 4
2.1.1 DEVICE_MODE ................................................................................................................... 7
2.1.2 GEST_ID ............................................................................................................................... 7
TD_STATUS .......................................................................................................................... 8
2.1.3
TOUCHn_XH (n:1-5) ............................................................................................................ 8
2.1.4
2.1.5
TOUCHn_XL (n:1-5) ............................................................................................................. 8
TOUCHn_YH (n:1-5) ............................................................................................................ 9
2.1.6
TOUCHn_YL (n:1-5) ............................................................................................................. 9
2.1.7
2.1.8
ID_G_THGROUP ................................................................................................................. 9
ID_G_THPEAK ..................................................................................................................... 9
2.1.9
ID_G_ THCAL ....................................................................................................................... 9
2.1.10
ID_G_ THWATER ................................................................................................................. 9
2.1.11
2.1.12
ID_G_ THTEMP ................................................................................................................... 9
ID_G_ THDIFF ................................................................................................................... 10
2.1.13
ID_G_ CTRL ....................................................................................................................... 10
2.1.14
2.1.15
ID_G_ TIMEENTERMONITOR .......................................................................................... 10
ID_G_ PERIODACTIVE ..................................................................................................... 10
2.1.16
ID_G_ PERIODMONITOR ................................................................................................. 10
2.1.17
ID_G_ AUTO_CLB_MODE ................................................................................................ 10
2.1.18
2.1.19
ID_G_ LIB_VERSION_H .................................................................................................... 11
ID_G_ LIB_VERSION_L ..................................................................................................... 11
2.1.20
ID_G_ CIPHER ................................................................................................................... 11
2.1.21
2.1.22
ID_G_ MODE ..................................................................................................................... 11
ID_G_ PMODE ................................................................................................................... 11
2.1.23
ID_G_ FIRMWARE_ID ....................................................................................................... 11
2.1.24
2.1.25
ID_G_ STATE ...................................................................................................................... 11
ID_G_ FT5201ID ................................................................................................................ 12
2.1.26
ID_G_ ERR .......................................................................................................................... 12
2.1.27
2.1.28
ID_G_ CLB .......................................................................................................................... 12
2.2 Test Mode ..................................................................................................................................... 12
2.2.1 DEVICE_MODE ................................................................................................................. 14
ROW_ADDR ........................................................................................................................ 14
2.2.2
2.2.3
ROWDATAN_H ................................................................................................................... 14
ROWDATAN_L .................................................................................................................... 15
2.2.4
2.3 System information Mode ............................................................................................................. 16
2.3.1 DEVICE_MODE ................................................................................................................. 17
2.3.2
BIST_COMM ....................................................................................................................... 17
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CTPM Application Note
2.3.3
BIST_STAT .......................................................................................................................... 17
BL_VERH ............................................................................................................................ 17
2.3.4
BL_VERL ............................................................................................................................. 18
2.3.5
FTS_IC_VERH .................................................................................................................... 18
2.3.6
FTS_IC_VERL ..................................................................................................................... 18
2.3.7
APP_IDH ............................................................................................................................. 18
2.3.8
2.3.9
APP_IDL ............................................................................................................................. 18
2.3.10 APP_VERH ......................................................................................................................... 19
2.3.11 APP_VERL .......................................................................................................................... 19
2.3.12 CID_n(n:0-4) ....................................................................................................................... 19
3
CTPM Application Introduction ................................................................................................... 20
3.1 Standard Application information of FT5X06 .............................................................................. 20
Standard application circuit of FT5206GE1 ....................................................................... 20
Standard application circuit of FT5306DE4 ....................................................................... 21
Standard application circuit of FT5206EE8 ....................................................................... 22
Communication between host and CTPM .................................................................................... 22
4
4.1 Communication Contents .............................................................................................................. 22
4.2
I2C Example Code ........................................................................................................................ 23
3.1.1
3.1.2
3.1.3
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CTPM Application Note
Terminology
CTP – Capacitive touch panel
CTPM – Capacitive touch panel module
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CTPM Application Note
1 I2C Interface
1.1 CTPM interface to Host
Figure 1-1 shows how CTPM communicates with the Host，there are three kind of communication between
CTPM and Host，we will introduce each communication in this section.
Transfer the data via I2C
Send interrupt when there is a valid touch
Host send Wakeup signal to CTPM
CTP
TX
RX
CTP
Controller
MCU
Serial
Interface
/INT
/WAKE
Host
Figure 1-1 CTPM and Host connection
The Power Supply voltage of CTPM is 2.8V~3.3V, interface supply voltage is 2.8V~3.3V. There are Control
Interface and Data Interface. As
the control interface. For the detail, please refer to Table 1-1.
Figure 1-1 demonstrates, Serial interface is the data interface, /INT and /WAKE are
Table 1-1 Description for TP module and Host interface
Port Name
Serial
interface
Voltage
2.8~3.3V
Polar
LOW
LOW
2.8~3.3V
2.8~3.3V
/INT
/WAKE*
1.2 I2C Read/Write Interface description
Write N bytes to I2C slave
Description
Serial interface is for data transfer between Host and CTPM.
CTPM support both I2C and SPI interface
The interrupt from the CTPM to the Host
Wakeup signal from host to the CTPM
D
0 A
P
A
C
K
S
T
O
P
Slave Addr
A
A
A
1
4
5
A
3
A
2
A
0
R
W A
R
7
Data Address[X]
R
R
1
6
R
5
R
4
R
3
R
2
W
R
I
T
E
A
C
K
S A
6
S
T
A
R
T
R
0 A
D
7
D
6
Data [X]
D
D
D
2
4
5
D
3
D
1
D
0 A
…
D
7
A
C
K
A
C
K
Data [X+N-1]
D
D
D
1
5
6
D
4
D
3
D
2
Set Data Address
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CTPM Application Note
S A
6
S
T
A
R
T
Slave Addr
A
A
A
1
4
5
A
3
A
2
A
0
R
W A
R
7
W
R
I
T
E
A
C
K
Read X bytes from I2C Slave
Data Address[X]
R
R
1
6
R
5
R
2
R
4
R
3
R
0 A
P
A
C
K
S
T
O
P
Slave Addr
A
A
A
1
4
5
A
3
A
2
A
0
R
W A
D
7
D
6
Data [N]
D
D
D
2
4
5
D
3
D
1
D
0 A
…
D
7
R
e
a
d
A
C
K
A
C
K
S A
6
S
T
A
R
T
Data [X+N-1]
D
D
D
1
5
6
D
4
D
3
D
2
D
0 A
P
A
C
K
S
T
O
P
1.3 Interrupt signal from CTPM to Host
As for standard CTPM, host need to use both interrupt control signal and serial data interface to get the touch
data. There are two kind of method to use interrupt: interrupt trigger and interrupt query.
Here is the timing to get touch data.
Touch Start
Touch End
/INT
Serial
Data
/INT
Serial
Data
Blank
Data Packet
0
Data Packet
1
……
Data Packet
N
Blank
Figure 1-2 Interrupt query mode
Touch Start
Touch End
Blank
Data Packet
0
Data Packet
1
……
Data Packet
N
Blank
Figure 1-3 Interrupt trigger mode
Host use general I2C protocol to read the touch data or the information from CTPM . CTPM will send host a
interrupt signal when there is a valid touch. Then host can use the serial data interface to get the touch data. If
there is no valid touch detected, the /INT will not be pulled up, the host do not need to read the touch data.
NOTE: “valid touch” may have different definition in various systems. For example, in some systems, the valid
touch is defined as there is one more valid touch point. But in some other systems, the valid touch is defined as
one more valid touch with valid gestures. In usual, /INT will be pulled up when there is a valid touch point, and
to be low when a touch finishes.
As for interrupt trigger mode, /INT signal will be low if there is a touch detected. But for per update of valid
touch data, CTPM will produce a valid pulse for /INT signal, host can read the touch data periodically according
to the frequency of this pulse. In this mode, the pulse frequency is the touch data update frequency.
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CTPM Application Note
.
1.4 Wakeup signal from Host to CTPM
Host can use the Wakeup Signal to wakeup the I2C slave device.
This pin should be connected to GND when flash programming while in normal running mode it should not be
connected to GND.
2 CTP Register Mapping
This chapter describes the standard FTS Capacitive Touch Panel products communication registers in address
order for each device mode. The most detailed descriptions of the Standard Products communication registers
are in the Register Definitions section of each chapter. The device modes are listed in the table below, along
with each mode’s register prefix.
Prefix
Device Mode
Op
Operating
Te
Test
System Information Sy
Val
000b
100b
001b
Description
Read touch point and gesture
Read raw data
Read system information related
Reserved
2.1 Operating Mode
In this mode the CTP is fully functional as a touch screen controller. Read and write access address is just
logical address which is not enforced by hardware or firmware. Here is the operating mode register map.
Operating Mode Register Map
Address Name
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 Host
Op,00h DEVIDE_MODE
Op,01h GEST_ID
Op,02h
TD_STATUS
Op,03h
TOUCH1_XH
Op,04h
Op,05h
TOUCH1_XL
TOUCH1_YH
TOUCH1_YL
TOUCH2_XH
Op,06h
Op,07h
Op,08h
Op,09h
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Device Mode[2:0]
Gesture ID[7:0]
1stEvent
Flag
1st Touch X Position[7:0]
1st Touch ID[3:0]
1st Touch Y Position[7:0]
2ndEvent
Number of
touch points[3:0]
1st Touch
X Position[11:8]
1st Touch
Y Position[11:8]
2ndTouch
4
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Access
RW
R
R
R
R
R
R
R
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