GT911-A1

Capacitive Touch Controller

The GT911-A1 is a capacitive touch controller from Goodix. View the full GT911-A1 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.

Official GT911-A1 datasheet (PDF) — the source this page was extracted from.

Manufacturer

Goodix

GT911-A1 Key Specifications

Parameter	Value
Rx Channels	14
Tx Channels	26
Supply Voltage Range	2.8V to 3.3V
Supported Screen Size	7' to 8'
Max Concurrent Touches	5
Communication Interfaces	I2C
Operating Temperature Range	-40°C to +85°C
Host Interface Voltage Range	1.8V to 3.3V

GT911-A1 Overview

Part: GT911 — Goodix Type: 5-Point Capacitive Touch Controller Description: A new-generation 5-point capacitive touch solution designed for 7' to 8' MID, supporting up to 5 concurrent touches with real-time tracking of accurate position and motion trajectory, and integrating HotKnot.

Operating Conditions:

Supply voltage: 2.8V to 3.3V
Operating temperature: -40 °C to +85 °C
Host interface voltage: 1.8V to 3.3V

Absolute Maximum Ratings:

Max supply voltage: 3.6V
Max junction/storage temperature: +125 °C

Key Specs:

Report rate: 100Hz
Channels: 26 (Tx) * 14 (Rx)
HotKnot transmission rate: 7.0Kbps (max)
HotKnot data frame maximum capacity: 128 bytes
Green mode response time: <48ms
Sleep mode response time: <200ms
Initialization time: <200ms
Power supply ripple: Vpp ≦ 50mV

Features:

Built-in capacitive sensing circuit and high-performance MPU
Outputs touch coordinates in real time
Flash embedded; In-system reprogrammable
Adaptive frequency hopping
Self-calibration during initialization
Automatic drift compensation
Supports touch key design on FPC
Supports OGS full lamination

Applications:

7' to 8' MID (Mobile Internet Device)

Package:

QFN 52 pins (6mm6mm0.8mm, 0.4mm Pitch)

GT911-A1 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 °C to +85 °C ; humidity: ≦ 95%RH
Storage temperature: -60 °C to +125 °C ; humidity: ≦ 95%RH
Host interface
Standard I 2 C 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, 6mm6mm0.8mm, 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

GT911-A1 Pin Configuration

Pin No.	Name	Function description	Remarks
1~11	SEN3 to SEN13	Receiver electrodes	Output drive signal while HotKnot function is on
12	AVDD28	Analog power	2.2μF filter capacitor to GND
13	AVDD18		2.2μF filter capacitor to GND
14	DVDD12		2.2μF filter capacitor to GND
15	DGND	Digital signal ground
16	INT	Interrupt signal
17	Sensor_OPT1	Module ID pin	Register configurable
18	Sensor_OPT2	Module ID pin	External pull-down resistor required
19	I2C_SDA	I 2 C data signal
20	I2C_SCL	I 2 C clock signal
21	VDDIO	Supply voltage of GPIO	2.2μF filter capacitor to GND Floating: 1.8V Connect to AVDD:AVDD
22	/RSTB	Reset pin	External 10K pull-up resistor required, active-low reset
23~48	DRV25 to DRV0	Transmitter electrodes
49	AGND	Analog signal ground
50~52	SEN0 to SEN2	Receiver electrodes	Output drive signal while HotKnot function is on

GT911-A1 Electrical Characteristics

(Ambient temperature:25 °C , AVDD=2.8V, VDDIO=1.8V)

Parameter	Min.	Typ.	Max.	Unit
OSC oscillation frequency	59	60	61	MHz
I/O output rise time, low to high	-	14	-	ns
I/O output fall time, high to low	-	14	-	ns

GT911-A1 Absolute Maximum Ratings

(Ambient temperature: 25

°C )

Parameter	Min.	Max.	Unit
Analog power AVDD28 (please refer to AGND)	2.66	3.47	V
VDDIO (please refer to DGND)	1.7	3.47	V
Voltage acceptable to digital I/O	-0.3	3.47	V
Voltage acceptable to analog I/O	-0.3	3.47	V
Range of operating temperature	-40	85	°C
Range of storage temperature	-60	125	°C
Welding temperature (10s)	-	300	°C
ESD protection voltage (HB Model)	-	±2	KV

GT911-A1 Recommended Operating Conditions

Parameter	Min.	Typ.	Max.	Unit
AVDD28	2.8	-	3.3	V
VDDIO	1.8	-	3.3	V
Working temperature	-20	25	85	°C

Variants on the same datasheet

These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.

Part Number	Manufacturer	Package
GT911	Goodix	QFN-52 (6x6mm, 0.4mm Pitch)

Data on this page is extracted from publicly available manufacturer datasheets using automated tools including AI. It may contain errors or omissions. Always verify specifications against the official manufacturer datasheet before making design or purchasing decisions. See our Terms of Service. Rights holders can submit a takedown request.

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