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of our knowledge, accurate. However, we assume no liability for any product failures or
damages, immediate or consequential, resulting from the use of the information provided
herein. Our products are not intended for use in systems in which failures of product could
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Datasheet
Goodix
GT911
GT911: 5-Point Capacitive Touch Controller for Small-Sized MID
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OODIX CONFIDENTIAL
Reproduction and/or distribution of this document in whole or in
part is strictly prohibited without written consent of GOODIX.
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.
GT911: 5-Point Capacitive Touch Controller for Small-Sized MID
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OODIX CONFIDENTIAL
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part is strictly prohibited without written consent of GOODIX.
Contents
1. Overview........................................................................................................................................................ 4
2. Features.........................................................................................................................................................4
3. Block Diagram...............................................................................................................................................5
4. Pin Configurations........................................................................................................................................6
5. Sensor Design.............................................................................................................................................. 7
5.1 Layout of Rx Channels........................................................................................................................7
5.2 Layout of Tx Channels........................................................................................................................ 7
5.3 Sensor Design Specifications............................................................................................................ 7
5.4 Touch Key Design................................................................................................................................ 8
6. I
2
C Communication...................................................................................................................................... 9
6.1 I
2
C Timing.......................................................................................................................................... 9
a) Data Transmission..................................................................................................................... 11
b) Writing Data to GT911............................................................................................................... 11
c) Reading Data from GT911....................................................................................................... 12
7. HotKnot Mode.............................................................................................................................................13
7.1 Start HotKnot...................................................................................................................................... 13
7.2 Data Transmission between TPs.....................................................................................................13
7.3 Host Receives Data from GT911.....................................................................................................13
8. Description on Functions.......................................................................................................................... 14
8.1 Operating Modes............................................................................................................................14
a) Normal Mode.............................................................................................................................. 14
b) Green Mode................................................................................................................................ 15
c) Gesture Mode.............................................................................................................................15
GT911: 5-Point Capacitive Touch Controller for Small-Sized MID
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OODIX CONFIDENTIAL
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part is strictly prohibited without written consent of GOODIX.
d) Sleep Mode.................................................................................................................................15
e) Approach Mode..........................................................................................................................15
f) Receive Mode.............................................................................................................................16
g) Send Mode..................................................................................................................................16
8.2 Interrupt Triggering Mechanism...................................................................................................16
8.3 Sleep Mode.....................................................................................................................................17
8.4 Stationary Configuration............................................................................................................... 17
8.5 Adaptive Frequency Hopping...................................................................................................... 17
8.6 Self-calibration................................................................................................................................17
a) Self-calibration during Initialization......................................................................................... 17
b) Automatic Drift Compensation.................................................................................................17
9. Sample Schematic.....................................................................................................................................18
10. Electrical Characteristics.................................................................................................................. 19
10.1 Absolute Maximum Ratings......................................................................................................... 19
10.2 Recommended Operating Conditions........................................................................................ 19
10.3 AC Electrical Characteristics........................................................................................................19
10.4 DC Electrical Characteristics....................................................................................................... 20
11. Package...............................................................................................................................................21
12. Revision History................................................................................................................................. 22
13. Contact Information........................................................................................................................... 23
GT911: 5-Point Capacitive Touch Controller for Small-Sized MID
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OODIX CONFIDENTIAL
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part is strictly prohibited without written consent of GOODIX.
1.Overview
GT911, a new-generation 5-point capacitive touch solution designed for 7” to 8” MID, consists of up to
26 Transmitter electrodes and 14 Receiver electrodes to provide higher touch accuracy.
GT911 supports up to 5 concurrent touches with real-time tracking of accurate position and motion
trajectory as well as touch area. Furthermore, it is able to report such information to the host as
required.
2.Features
Built-in capacitive sensing circuit and high-performance MPU
Report rate: 100Hz
Outputs touch coordinates in real time
Unified software applicable to capacitive touch screens of various sizes
Single power supply, internal 1.8V LDO
Flash embedded; In-system reprogrammable
HotKnot integrated
Capacitive touch sensor
Channels: 26 (Tx channels)*14 (Rx channels)
Supports capacitive touch screen sizes: 7” to 8”
Supports touch key design on FPC
Supports ITO glass and ITO Film
Cover Lens thickness supported: 0.55mm ≦ Glass ≦ 2mm,
0.5mm ≦PMMA ≦ 1.2mm,
(For detail, please refer to Sensor Design Guidelines)
Adaptive frequency hopping
Supports OGS full lamination
HotKnot
Transmission rate：7.0Kbps(max)
Data frame maximum capacity：128 bytes
Applicable sensor types: OGS/traditional GFF/GG/GF
Environmental adaptability
Self-calibration during initialization
Automatic drift compensation
Operating temperature: -40℃ to +85℃; humidity: ≦95%RH
Storage temperature: -60℃ to +125℃; humidity: ≦95%RH
