GOODIX CONFIDENTIAL
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Contents
1. Description on Interface.......................................................................................................................................... 3
2. Communication Timings......................................................................................................................................... 3
2.1 Timing for Write Operation........................................................................................................................... 3
2.2 Timing for Read Operation ........................................................................................................................... 4
3. Register Map ........................................................................................................................................................... 4
3.1 Real-time Command (Write only)................................................................................................................. 4
3.2 Configuration Information (R/W) ................................................................................................................. 5
3.3 Coordinate Information............................................................................................................................... 13
3.4 Command Status Registers of GT911 ......................................................................................................... 17
3.5 Hotknot Status Registers ............................................................................................................................. 19
3.6 HotKnot Transmit Buffer ............................................................................................................................ 21
3.7 Hotknot Receive Buffer .............................................................................................................................. 22
4. Power-on Initialization and Modification on Register Value ................................................................................ 23
4.1 Power-On Timing of GT911 ....................................................................................................................... 23
4.2 I2C Address Selection during Power-on or Reset Process........................................................................... 24
4.3 Send Configuration after Power-on............................................................................................................. 25
4.4 Register Value Modification........................................................................................................................ 25
5. Coordinates Reading ............................................................................................................................................. 25
6. Operation Modes Switchover............................................................................................................................ 27
6.1 Operation Modes ......................................................................................................................................... 27
a) Normal Mode ............................................................................................................................................ 27
b) Green( Low Power) Mode......................................................................................................................... 27
c) Gesture Mode ............................................................................................................................................ 28
d) Sleep Mode and Wakeup ........................................................................................................................... 28
e) Approach Mode......................................................................................................................................... 29
f) Receive Mode............................................................................................................................................ 29
g) Send Mode ................................................................................................................................................ 29
7. Host System Driver Modification in Gesture Mode.......................................................................................... 30
7.1 Enter Gesture Mode after Screen-off........................................................................................................... 30
7.2 Enter Sleep Mode after Screen-off .............................................................................................................. 30
7.3 Press Power (or Home) Key to Wake up Host ............................................................................................ 30
7.4 Recommended to Apply in Conjunction with IR ........................................................................................ 30
7.5 Hardware Circuit Modification ................................................................................................................... 30
8. Reading Coordinate in Gesture Mode............................................................................................................... 31
9. Time Limit for Downloading HotKnot Firmware............................................................................................. 31
10. Revision History................................................................................................................................................ 31
