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PDF GT911 Data sheet ( Hoja de datos )
| Número de pieza | GT911 | |
| Descripción | 5-Point Capacitive Touch Controller | |
| Fabricantes | GOODIX | |
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GT911: 5-Point Capacitive Touch Controller for Small-Sized MID
GT911
5-Point Capacitive Touch Controller for
Small-Sized MID
Rev.09——March 11, 2015
====== Disclaimer ======
The information concerning the device in this publication is intended for you only and is subject
to change without prior notice. It is your responsibility to ensure its application complies with
technical specifications. Shenzhen Huiding Technology 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 representation or
guarantee for its application, quality, performance, merchantability or fitness for a particular
purpose. GOODIX shall assume no responsibility for this information and relevant consequences
arising out of the use of such information. Without written consent of GOODIX, it is prohibited to
use GOODIX products as critical components in any life support system. This document conveys
no licenses, implicitly or otherwise, to any intellectual property rights belonging to GOODIX or
any other entities.
GOODIX CONFIDENTIAL
Reproduction and/or distribution of this document in whole or in
part is strictly prohibited without written consent of GOODIX.
1
1 page  
GT911: 5-Point Capacitive Touch Controller for Small-Sized MID
Host interface
Standard I2C interface
Works in slave mode
Supports 1.8V to 3.3V host interface voltage
Response time
Green mode: <48ms
Sleep mode: <200ms
Initialization: <200ms
Power supply voltage:
Single supply: 2.8V to 3.3V
Power supply ripple:
Vpp≦50mV
Package: 52 pins, 6mm*6mm*0.8mm, QFN 0.4mm Pitch
Tools provided to support application development:
Touch panel module parameter detector and auto-generator
Touch panel module performance test tool
MP Test Tool
Reference driver code and documentary guide for host software development
3.Block Diagram
GOODIX CONFIDENTIAL
Reproduction and/or distribution of this document in whole or in
part is strictly prohibited without written consent of GOODIX.
5
5 Page 
GT911: 5-Point Capacitive Touch Controller for Small-Sized MID
a) Data Transmission
(For example：device address is 0xBA/0xBB)
Communication is always initiated by the host. Valid Start condition is signaled by pulling SDA line
from “high” to “low” when SCL line is “high”. Data flow or address is transmitted after the Start
condition.
All slave devices connected to I2C bus should detect the 8-bit address issued after Start condition and
send the correct ACK. After receiving matching address, GT911 acknowledges by configuring SDA
line as output port and pulling SDA line low during the ninth SCL cycle. When receiving unmatched
address, namely, not 0XBA or 0XBB, GT911 will stay in an idle state.
For data bytes on SDA, each of 9 serial bits will be sent on nine SCL cycles. Each data byte consists
of 8 valid data bits and one ACK or NACK bit sent by the recipient. The data transmission is valid
when SCL line is “high”.
When communication is completed, the host will issue the STOP condition. Stop condition implies the
transition of SDA line from “low” to “high” when SCL line is “high”.
b) Writing Data to GT911
(For example：device address is 0xBA/0xBB)
Timing for Write Operation
The diagram above displays the timing sequence of the host writing data onto GT911. First, the host
issues a Start condition. Then, the host sends 0XBA (address bits and R/W bit; R/W bit as 0 indicates
Write operation) to the slave device.
After receiving ACK, the host sends the 16-bit register address (where writing starts) and the 8-bit
data bytes (to be written onto the register).
The location of the register address pointer will automatically add 1 after every Write Operation.
Therefore, when the host needs to perform Write Operations on a group of registers of continuous
addresses, it is able to write continuously. The Write Operation is terminated when the host issues the
Stop condition.
GOODIX CONFIDENTIAL
Reproduction and/or distribution of this document in whole or in
part is strictly prohibited without written consent of GOODIX.
11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet GT911.PDF ] | |
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