UM0401 datasheet(1/17 Pages) STMICROELECTRONICS

Part #	UM0401

Description	User manual for eight bit port expander

PDF	17 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 17 page

June 2007

Rev 1

1/17

UM0401

User manual

User manual for eight bit port expander

STMPE801 demonstration board

Introduction

This document explains the functioning of the demo board for the port expander Chip

STMPE801 with a PC GUI for reading and writing to the eight GPIOs and controlling the I2C

interface.

The objective of this demonstration board is to display the capabilities of the 8-bit port

expander (STMPE801) developed by STMicroelectronics using a Windows-based software

application. The software application provides a user-friendly environment to test the port

expander and verify its functionality.

The board is controlled by the GUI through the parallel port in the PC. The power to the

board should come from an external 5 V constant DC power supply.

The PC based GUI acts as the I2C host and controls the STMPE801 slave on the board.

The eight GPIOs in the STMPE801 are accessible through headers and can be easily pulled

high or low using jumpers. The GPIOs can be configured as outputs by writing to the

appropriate registers using the GUI. All these interfaces are controlled by using I2C

communication between Host and Slave devices.

In addition, the hardware has a provision for controlling the STMPE801 through an external

I2C master.

www.st.com

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