AN3245 Datasheet, PDF (1/19 Pages) STMicroelectronics – A hardware and software guide for the STMPE1801 Xpander

AN3245
Application note
A hardware and software guide for the STMPE1801 Xpander
Logic™ 18-bit enhanced port expander with keypad controller
Introduction
The STMPE1801 is a GPIO (general purpose input/output) port expander able to interface a
main digital ASIC via a two-line bidirectional bus (I²C). It offers the flexibility to be configured
into a 10x8 matrix keypad controller for QWERTY keyboards and general purpose
inputs/outputs.
This document highlights the guidelines and information complementary to the
STMPE1801; Xpander Logic^TM 18-bit enhanced port expander with keypad controller,
datasheet, which is necessary for the successful design of STMPE1801 in applications.
The first part of the document highlights information on the hardware including external
components/connectivity, power, etc.
The second part of the document focuses on information regarding the software, in which
programming sample codes are shown.
November 2010
Doc ID 17747 Rev 1
1/19
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