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GOODIX CONFIDENTIAL 

Reproduction and/or distribution of this document in whole or in part is strictly prohibited without written consent of GOODIX.

 

 

5

3.2 Configuration information (R/W) 

Register 

Config Data 

bit7 

bit6 

bit5 

bit4 

bit3 

bit2 

bit1 

bit0 

0x8047 

Config_ 

Version 

The version number of configuration documents ( configuration parameters will be updated only 

when the version number of the new release is later than that of the previous one, or equal to that of 

the previous one but there are changes in contents; documents are numbered sequentially from 'A' to 

'Z'; Send 0x00 and the version number is reset to ‘A’) 

0x8048 

X Output Max 

(Low Byte) 

Resolution of X axis 

0x8049 

X Output Max 

(High Byte) 

0x804A 

Y Output Max 

(Low Byte) 

Resolution of Y axis 

0x804B 

Y Output Max 

(High Byte) 

0x804C 

Touch Number 

Reserved 

Touch points supported: 1 to 5 

0x804D 

Module_ 

Switch1 

Driver_ 

Resersal 

(Y2Y) 

Sensor_ 

Resersal 

X2X

Stretch_rank 

X2Y 

  (X,Y

 

axis 

switch-ov

er

Sito 

 

(

Software 

noise 

reduction

INT triggering mechanism
00: rising edge   
01: falling edge   
02: Low level   
03: High level

 

0x804E 

Module_ 

switch2 

Reserved 

FirstFilte

r_Dis 

Reserved

 

Approch_

En 

HotKnot 

_En 

Touch_ 

Key 

0x804F 

Shake_Count 

De-jitter frequency when touch is being released

 

De-jitter frequency when touch is pressing down 

 

0x8050 

Filter 

First_Filter 

Normal_Filter (

Filter threshold for original coordinates, coefficient is 4

0x8051 

Large_Touch 

Number of large-area touch points

 

0x8052 

Noise_ 

Reduction 

Reserved 

Noise reduction value (0-15 valid, coefficient is 1)

 

0x8053 

Screen_ 

Touch_Level 

Threshold for touch to be detected 

 

0x8054 

Screen_ 

Leave_Level 

Threshold for touch to be released

 

0x8055 

Low_Power_ 

Control 

Reserved 

Interval to enter lower power consumption

 mode (0s 

to 15s) 

0x8056 

Refresh_Rate 

Pulse width setting for gesture wakeup 

Coordinates report rate (period: 5+N ms)

 

0x8057 

x_threshold 

X coordinate output threshold: 0-255 (Based on the last reported coordinates; If configured to 0, GT911 will 

keep outputting coordinates continuously)

 

0x8058 

y_threshold 

Y coordinate output threshold: 0-255 (Based on the last reported coordinates. If configured to 0, GT911 will keep 

outputting coordinates continuously)

 

0x8059 

X_Speed_Limit 

Reserved 

0x805A 

Y_Speed_Limit 

Summary of Contents for GT911

Page 1: ...ology Co Ltd hereafter referred to as GOODIX makes no representation or guarantee for this information either expressed or implied written or verbal statutory or otherwise including but not limited to...

Page 2: ...Value 23 4 1 Power On Timing of GT911 23 4 2 I2 C 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 Readi...

Page 3: ...e edges of SCL and SDA are steep enough GT911 invariably serves as slave device in communication and its I2 C device address consists of 7 device address bits and 1 Read Write control bit The high 7 b...

Page 4: ...nication has to be resent 3 Register Map 3 1 Real time command Write only Addr Name bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0x8040 Command 0 Read coordinates status 1 Read diff data or raw data 2 Read...

Page 5: ...ing edge 01 falling edge 02 Low level 03 High level 0x804E Module_ switch2 Reserved FirstFilte r_Dis Reserved Approch_ En HotKnot _En Touch_ Key 0x804F Shake_Count De jitter frequency when touch is be...

Page 6: ...Multiplier Factor of drive frequency of Driver Group B GroupB_Frequence Clock Multiplier Factor Fundamental Frequency 0x8067 Pannel_ BitFreqL Fundamental Frequency of Driver Groups A and B 1526HZ Fund...

Page 7: ...V Double ta p Swipe down 0x8077 Gesture_Refresh_R ate Report rate in Gesture mode period is 5 ms 0x8078 Gesture_Touch_ Level Touch threshold in Gesture mode 0x8079 NewGreenWake UpLevel Threshold for...

Page 8: ...0x8082 Hopping_Sensor_G roup Sections for Hopping Frequency Noise Detection 4 sections recommended 0x8083 Hopping_seg1_Nor malize Seg1 Normalize coefficient sampling value N 128 Raw data 0x8084 Hoppi...

Page 9: ...efficient of Key 2 0x809B Key_Sens KeySens_3 sensitivity coefficient of Key 3 KeySens_4 sensitivity coefficient of Key 4 0x809C Key_Restrain The key restrain interval after finger leaves screen unit 1...

Page 10: ...ed 0x80B2 NC Reserved 0x80B3 Combine_Dis Distance for adjacent rectangles to be combined in Gesture mode Distance for adjacent rectangles to be combined 0x80B4 Split_Set Distance for a large area rect...

Page 11: ...area is 15 32 480 original coordinates one Pitch consists of 512 original coordinates if the cutting exceeds one Pitch it is allowed to subtract one Pitch from the configuration 0x8070 Module_Switch3...

Page 12: ...et value x4 then the optical frequency is selected and frequency hopping is enabled 0x809A 0x809B Key_Sens The sensitivity coefficient configuration of 4 independent touch keys can be configured to 0...

Page 13: ...stance for adjacent rectangles to be combined in Gesture mode 0 to 15 configurable the distance for adjacent touch points to be combined is calculated as sqrt 2 Combin_Dis pitch For backward compatibi...

Page 14: ...Reserved 0x814E R W buffer status large detect Proximity Valid HaveKey number of touch points 0x814F R track id is 32 indicates the signal is proximity sensing signal 0x8150 R PxyOk Reserved 0x8151 R...

Page 15: ...8177 R track id 0x8178 R point 5 x coordinate low byte 0x8179 R point 5 x coordinate high byte 0x817A R point 5 y coordinate low byte 0x817B R point 5 y coordinate high byte 0x817C R point 5 size low...

Page 16: ...f the key will be 0x8177 Gesture Features share the addresses with the coordinate information Addr Access bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0x8140 R Gesture ID first Byte ASCII G 0x8141 R Gestur...

Page 17: ...R Gesture P2 X coor high byte 0x8163 R Gesture P2 Y coor low byte 0x8164 R Gesture P2 Y coor high byte 0x8165 R Gesture P3 X coor low byte 0x8166 R Gesture P3 X coor high byte 0x8167 R Gesture P3 Y c...

Page 18: ...es track id is 32 The host can issue command 0X29 to enable GT911 to exit master approach mode 0xAA When GT911 successfully detect another hotknot featured terminal the host downloads and sends the ho...

Page 19: ...ry description on some registers The data read from this area is valid only when GT911 operates in Receive Mode or Send Mode that is to say only when GT911_Status is 0xAA or 0xBB 0xAB10 SendStatus Thi...

Page 20: ...ecting data from the transmitting terminal but no valid signal has been detected yet 0x02 indicates GT911 has detected the start signal and is receiving data 0x03 indicates GT911 has received a data f...

Page 21: ...k If the values are different the host will read the values again 2ms later 3 6 HotKnot Transmit Buffer Addr Access bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0xAC90 W DataLength valid data length 129 by...

Page 22: ...0xAE92 0xAE93 R Crc16Check data CRC16 verification Please note that it should stay behind the data not fixed in this address big edian mode Supplementary description on some registers The data in thi...

Page 23: ...cData unsigned short Crc16 unsigned char SrcData unsigned char length unsigned short crc 0xFFFF unsigned char i j unsigned char value bit flag bit c15 for i 0 i length i value SrcData i for j 0 j 8 j...

Page 24: ...0x29 host outputs high if the address is 0xBA 0xBB host outputs low Timing for host resetting GT911 4 2 I2 C address selection during power on or reset process GT911 supports two I2 C slave device ad...

Page 25: ...When modifying any register in the configuration area 0x8047 0x80FE based on the timing sequence as specified in section 2 it is required to update Config_Chksum 0x80FF and eventually set Config_Fresh...

Page 26: ...al output take the rising edge triggered interrupt for example The timing for falling edge triggered interrupt is similar to this one 1 In standby mode INT outputs low level 2 Output rising edge when...

Page 27: ...ble GT911 operates in Normal mode If no touch is detected within that period GT911 enters Low Power mode low speed scan a Normal Mode When GT911 is operating in Normal mode its fastest coordinates ref...

Page 28: ...any writing of specified lower case letters on the TP INT will output high level or a pulse that is greater than 250us The host wakes up and turns on the screen after receiving such high level or pul...

Page 29: ...er the two terminals have detected each other Then the host downloads and sends HotKnot transmission firmware to enable GT911 to enter Receive mode f Receive Mode When GT911 operates in Approach mode...

Page 30: ...vel 7 2 Enter Sleep Mode after screen off a If screen off is achieved by pressing Power key or any other key send Command 5 to 0x8040 b If screen off is achieved due to timeout send Command 5 to 0x804...

Page 31: ...And then it reads the registers ranged from 0x9420 to 0x951F based on the principle that every four register correspond to one touch point Finally the host can describe the real touch trajectory of us...

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