GT911

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)

• 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 QFN-52 (6x6mm, 0.4mm Pitch) Pinout

Pin Number	Pin Name	Type	Description
1	SEN3	I	Receiver electrode
2	SEN4	I	Receiver electrode
3	SEN5	I	Receiver electrode
4	SEN6	I	Receiver electrode
5	SEN7	I	Receiver electrode
6	SEN8	I	Receiver electrode
7	SEN9	I	Receiver electrode
8	SEN10	I	Receiver electrode
9	SEN11	I	Receiver electrode
10	SEN12	I	Receiver electrode
11	SEN13	I	Receiver electrode
12	AVDD28	P	Analog power supply (2.8V)
13	AVDD18	P	Analog power supply (1.8V)
14	DVDD12	P	Digital power supply (1.2V)
15	DGND	S	Digital signal ground
16	INT	O	Interrupt signal
17	Sensor_OPT1	I	Module ID pin (register configurable)
18	Sensor_OPT2	I	Module ID pin (external pull-down resistor required)
19	I2C_SDA	I/O	I²C data signal
20	I2C_SCL	I/O	I²C clock signal
21	VDDIO	P	GPIO supply voltage (1.8V or AVDD)
22	/RSTB	I	Reset pin (active-low, external 10K pull-up required)
23	DRV25	O	Transmitter electrode
24	DRV24	O	Transmitter electrode
25	DRV23	O	Transmitter electrode
26	DRV22	O	Transmitter electrode
27	DRV21	O	Transmitter electrode
28	DRV20	O	Transmitter electrode
29	DRV19	O	Transmitter electrode
30	DRV18	O	Transmitter electrode
31	DRV17	O	Transmitter electrode
32	DRV16	O	Transmitter electrode
33	DRV15	O	Transmitter electrode
34	DRV14	O	Transmitter electrode
35	DRV13	O	Transmitter electrode
36	DRV12	O	Transmitter electrode
37	DRV11	O	Transmitter electrode
38	DRV10	O	Transmitter electrode
39	DRV9	O	Transmitter electrode
40	DRV8	O	Transmitter electrode
41	DRV7	O	Transmitter electrode
42	DRV6	O	Transmitter electrode
43	DRV5	O	Transmitter electrode
44	DRV4	O	Transmitter electrode
45	DRV3	O	Transmitter electrode
46	DRV2	O	Transmitter electrode
47	DRV1	O	Transmitter electrode
48	DRV0	O	Transmitter electrode
49	AGND	S	Analog signal ground
50	SEN0	I	Receiver electrode
51	SEN1	I	Receiver electrode
52	SEN2	I	Receiver electrode

Notes

• SEN pins (1–11, 50–52): Receiver electrodes; output drive signal while HotKnot function is enabled.
• DRV pins (0–25): Transmitter electrodes (26 total).
• Power supply filtering: AVDD28, AVDD18, and DVDD12 each require 2.2μF filter capacitor to GND.
• VDDIO: Can be left floating (defaults to 1.8V) or connected to AVDD.
• /RSTB: Active-low reset; requires external 10K pull-up resistor.
• Sensor_OPT2: Requires external pull-down resistor.
• Pin numbers extracted from QFN-52 package diagram (6×6mm, 0.4mm pitch).

(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

(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

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