AN3128 datasheet(11/105 Pages) STMICROELECTRONICS

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AN3128

Touchscreen controller hardware description

Doc ID 16918 Rev 5

11/105

Touchscreen controller hardware description

2.1

Description

In this section we describe an example device that could be used for the touchscreen

management. This device is present on both STM3210C-EVAL and STM32100E-EVAL

demonstration board. The STMPE811 is a GPIO (general purpose input/output) port

expander able to interface a main digital ASIC via the two-line bi-directional bus (I2C). A

separate GPIO expander is often used in mobile multimedia platforms to solve the problem

regarding the limited amount of GPIOs typically available on the digital engine.

The STMPE811 offers great flexibility, as each I/O can be configured as input, output, or

specific functions. The device has been designed with very low quiescent current and

includes a wake-up feature for each I/O, to optimize the power consumption of the device.

A 4-wire touchscreen controller is built into the STMPE811. The touchscreen controller is

enhanced with a movement tracking algorithm (to avoid excessive data), a 128 x 32-bit

buffer and programmable active window feature.

2.2

Features

●

8 GPIOs

●

1.8 - 3.3 V operating voltage

●

Integrated 4-wire touchscreen controller

●

Interrupt output pin

●

Wake-up feature on each I/O

●

SPI and I2C interface

●

Up to 2 devices sharing the same bus in I2C mode (1 address line)

●

8-input 12-bit ADC

●

128-depth buffer touchscreen controller

●

Touchscreen movement detection algorithm

●

25 kV air-gap ESD protection (system level)

●

4 kV HBM ESD protection (device level).

2.3

STMPE811 functional overview

The STMP811 consists of the following blocks:

●

I2C and SPI interface

●

Analog-to-digital converter (ADC)

●

Touchscreen controller (TSC)

●

Driver and switch control unit

●

Temperature sensor

●

GPIO controller.

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