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Using the STMPE801 as a keypad controller
Author: STMicroelectronics

The STMPE801 is an 8bit general purpose port expander device in STMicroelectronics' port expander logic family. Its eight GPIOs (General Purpose Input Output) are connected to the host system using a standard I2C connection. This application note explains how to control an 8*8 (64-key) matrix keypad using the 8 internal GPIOs of a base-band processor and the 8 GPIOs of the STMPE801 port expander.

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