OTT2001A
Touch Application Note I2C Protocol Guide
Preliminary
Aug. 20, 2013
Solution Depot Limited I2C Protocol Guide
Table of Content
1 Introduction............................................................................................................................................3 2
I2C Interface Protocol............................................................................................................................4 2.1 Timing Characteristic................................................................................................................4
2.2 I2C Buffer and Data Format......................................................................................................5 2.3 Function Description.................................................................................................................6 2.4 Operation Definition..................................................................................................................7
2.4.1 I2C R/W Timing Table .................................................................................................7 2.4.2 Touch event....................................................................................................................8 2.4.3 Setting TP On/Off..........................................................................................................9
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The information contained herein is the exclusive property of Solution Depot Limited. and shall not be distributed, reproduced, or disclosed in whole or in part without prior written permission of Solution Depot Limited.
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Solution Depot Limited I2C Protocol Guide
1 Introduction
The OTT2001A, a 208 channels capacitive touch driver LSI, is designed for up to7” passive matrix touch module. When users touch module by finger, the module can send coordinates of point at the contact point to host. The finger position information is sent to host by I2C bus which is determined by host through INT line. The purpose of this guide is to introduce the I2C protocol in detail.
本资料问新励科技专有之财产，非经书面许可，不准透露或使用本数据，亦不准复印、复制或转变为任何其它型式使用。
The information contained herein is the exclusive property of Solution Depot Limited. and shall not be distributed, reproduced, or disclosed in whole or in part without prior written permission of Solution Depot Limited.
Page 3 of 9
Solution Depot Limited I2C Protocol Guide
2 I2C Interface Protocol
Figure shows the I2C byte format. Each transmission has to start with a start (S) or repeated start (Sr) bit and end with a stop (P) or repeated start bit. Each byte has to be followed by and acknowledge (ACK) bit. The byte data is sent with MSB first.
Figure 2 I2C byte format
2.1 Timing Characteristic
Figure 2.1 Definition of timing
Table 1. Characteristics
Parameter Symbol Min. Typ. Max. Unit Working Frequency INT Low Time I2C Clock Low I2C Clock High I2C Data rising time I2C Data falling time I2C Data hold time I2C Data setup time I2C Start Condition
hold time I2C Start Condition
setup time
Fclk TINTL TCKL TCKH Tr Tf TDatHd TDatSu
Conditions VDD=3.3V,TA=25℃ VDD=3.3V,TA=25℃ VDD=3.3V,TA=25℃ VDD=3.3V,TA=25℃ VDD=3.3V,TA=25℃ VDD=3.3V,TA=25℃ VDD=3.3V,TA=25℃ VDD=3.3V,TA=25℃ VDD=3.3V,TA=25℃
-
- 2.5 2.5
-
2
200 -
Khz VDD=3.3V,TA=25℃ uS uS uS nS nS nS nS nS nS
- - - - - -
- -
300 300
- -
0 100
- - - -
TStaHd 200 - TStaSu 600 -
本资料问新励科技专有之财产，非经书面许可，不准透露或使用本数据，亦不准复印、复制或转变为任何其它型式使用。
The information contained herein is the exclusive property of Solution Depot Limited. and shall not be distributed, reproduced, or disclosed in whole or in part without prior written permission of Solution Depot Limited.
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Solution Depot Limited I2C Protocol Guide
I2C Stop Condition
setup time I2C Bus free time
TStpSu 600 - TBusFree
2.5
- -
nS uS
VDD=3.3V,TA=25℃ VDD=3.3V,TA=25℃
-
2.2 I2C Buffer and Data Format
Touch panel is used as I2C Slave Device，I2C Salve address is 0x59。
I2C Buffer Address
Function of this I2C Buffer
Status
00H GestureID R 01H TouchPoint1XH R 02H TouchPoint1XL R 03H TouchPoint1YH R 04H TouchPoint1YL R 05H TouchPoint2XH R 06H TouchPoint2XL R 07H TouchPoint2YH R 08H TouchPoint2YL R 09H Resolution-XH R 0AH Resolution-XL R 0BH Resolution-YH R 0DH
Sensor Operation Control
R
0CH Resolution-YL R 0EH Reserve R 0FH Reserve R 10H TouchPoint3XH R 11H TouchPoint3XL R 12H TouchPoint3YH R 13H TouchPoint3YL R 14H TouchPoint4XH R 15H TouchPoint4XL R 16H TouchPoint4YH R 17H TouchPoint4YL R 18H TouchPoint5XH R 19H TouchPoint5XL R 1AH TouchPoint5YH R 1BH TouchPoint5YL R
本资料问新励科技专有之财产，非经书面许可，不准透露或使用本数据，亦不准复印、复制或转变为任何其它型式使用。
The information contained herein is the exclusive property of Solution Depot Limited. and shall not be distributed, reproduced, or disclosed in whole or in part without prior written permission of Solution Depot Limited.
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Solution Depot Limited I2C Protocol Guide
2.3 Function Description
I2C Buffer Address
00H
Bit
Function Description
Status R R R R R R R R R
7…0 Gesture ID
0x00: finger leave 0 1 2 3 4 7..5
01H 02H
1：coordinator (X1，Y1) valid 0：coordinator (X1，Y1) invalid 1：coordinator (X2，Y2) valid 0：coordinator (X2，Y2) invalid 1：coordinator (X3，Y3) valid 0：coordinator (X3，Y3) invalid 1：coordinator (X4，Y4) valid 0：coordinator (X4，Y4) invalid 1：coordinator (X5，Y5) valid 0：coordinator (X5，Y5) invalid
Reserve X1[15:8] X1[7:0]
03H Y1[15:8] R 04H Y1[7:0] R 05H X2[15:8] R 06H X2[7:0] R 07H Y2[15:8] R 08H Y2[7:0] R 09H Resolution1 R 0AH Resolution2 R 0BH Resolution3 R Bit
0DH
7
Power mode control register Sensor On/Off Control 0:Disable Sensor
1:Enable Sensor(Default)
6..0 Reserve R/W
0CH Resolution4 R 0EH Reserve R 0FH Reserve R 10H X3[15:8] R 11H X3[7:0] R 12H Y3[15:8] R 本资料问新励科技专有之财产，非经书面许可，不准透露或使用本数据，亦不准复印、复制或转变为任何其它型式使用。
The information contained herein is the exclusive property of Solution Depot Limited. and shall not be distributed, reproduced, or disclosed in whole or in part without prior written permission of Solution Depot Limited.
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13H Y3[7:0] R Solution Depot Limited I2C Protocol Guide
14H X4[15:8] R 15H X4[7:0] R 16H Y4[15:8] R 17H Y4[7:0] R 18H X5[15:8] R 19H X5[7:0] R 1AH Y5[15:8] R 1BH Y5[7:0] R
2.4 Operation Definition
2.4.1 I2C R/W Timing Table
2.4.1.1 Write a byte to I2C Buffer Register
W(0)A0A1A2A3A4A5A6START2.4.1.2 Read a byte from I2C Buffer Register
I2CDeviceAddress
W(0)XXXXXXXXXXXXXXXXSTOP
I2C
STARTI2CBufferAddress
XXXXXXXXSTARTI2CDeviceAddress
R(1)RegisterXXXXXXXXA0A1A2A3A4A5A6A0A1A2A3A4A5A6STOPINT1
0
NOTE: Before the resend a START signal ,do not send a STOP signal, otherwise the I2C Buffer Address changes back into 0x00.
2.4.2 Touch event
2.4.2.1 First time finger touch on the panel, INT will active a falling edge signal that there is a touch event.
本资料问新励科技专有之财产，非经书面许可，不准透露或使用本数据，亦不准复印、复制或转变为任何其它型式使用。
The information contained herein is the exclusive property of Solution Depot Limited. and shall not be distributed, reproduced, or disclosed in whole or in part without prior written permission of Solution Depot Limited.
Page 7 of 9
Solution Depot Limited I2C Protocol Guide
2.4.2.2 Finger hold on touch panel, INT will active a falling edge signal each detect frame
2.4.2.3 Finger leave from the touch panel, INT will active a falling edge signal to indicate finger leave from touch panel, and the touch sensor will respond(0,0) coordinate to I2C master
2.4.3 Setting TP On/Off
Write a byte 0x80/0x00 to I2C buffer address 0DH to set TP On/Off.
本资料问新励科技专有之财产，非经书面许可，不准透露或使用本数据，亦不准复印、复制或转变为任何其它型式使用。
The information contained herein is the exclusive property of Solution Depot Limited. and shall not be distributed, reproduced, or disclosed in whole or in part without prior written permission of Solution Depot Limited.
Page 8 of 9
Solution Depot Limited I2C Protocol Guide
本资料问新励科技专有之财产，非经书面许可，不准透露或使用本数据，亦不准复印、复制或转变为任何其它型式使用。
The information contained herein is the exclusive property of Solution Depot Limited. and shall not be distributed, reproduced, or disclosed in whole or in part without prior written permission of Solution Depot Limited.
Page 9 of 9
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