GT928 10-Point Capacitive Touch Controller

Description

1.Overview

GT928, a new-generation 10-point capacitive touch solution designed for 7” to 10.1” portable devices,

consists of up to 32 Transmitter electrodes and 24 Receiver electrodes to achieve higher accuracy and

resolution.

GT928 supports up to 10 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

1> 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

2> Capacitive touch sensor

Channels: 32(Tx channels)*24(Rx channels)

Supports capacitive touch sensor sizes: 7” to 10.1” (diagonal)

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

Adaptive frequency hopping

Supports OGS full lamination

3> HotKnot

Transmission rate: 7.0Kbps (max)

Data frame maximum capacity：128 bytes

Applicable sensor stackups: OGS/conventional, GFF/GG/ GF

4> 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

5> Host interface

Standard I2C interface

Works in slave mode

Supports 1.8V to 3.3V host interface voltage

6> Response time

Green mode: <48ms

Sleep mode: <200ms

Initialization: <200ms

7> Power supply voltage:

Single supply: 2.8V to 3.3V

8> Power supply ripple:Vpp≦50mV

9> Package: 68 pins, 8mm*8mm QFN_0.4P

10> Tools that support application development:

Touch panel parameter detector and generator

Touch panel performance tester

Mass production test kit

Reference driver code and documentary guide for host software development