MCP23S17 I/O Expander

16-Bit I/O Expander with Serial Interface (SPI)

Hello World

Import programMCP23S17_Basic_IO_Demo

A simple IO demo using the MCP23S17 library

Last commit 28 Jan 2011 by jim hamblen

Library

Import programMCP23S17

v 0.4

Last commit 28 Aug 2010 by Romilly Cocking

Datasheet

http://ww1.microchip.com/downloads/en/DeviceDoc/21952b.pdf

Notes

This SPI I/O expander chip has an internal power on reset and you can just tie the reset pin high (don't just leave it floating) - per data sheet at http://ww1.microchip.com/downloads/en/DeviceDoc/21952b.pdf it must be "externally biased".
Make sure that you order the chip in a skinny DIP package it you want to plug it directly in the breadboard. It also comes in surface mount.

DigiKey stocks and sells both SPI and I2C versions in a DIP for around $1.50.

MCP2S317 - SPI 16 bit I/O port expander

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=MCP23S17-E/SP-ND

and

MCP23017 - I2C 16 bit I/O port expander

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=MCP23017-E/SP-ND

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