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Home › Magazines › 2009 › July/August › Port Expander

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Port Expander

Published in issue 391, July/August 2009

It can sometimes happen that even when using the largest version of a microcontroller for a particular design application there are just not enough I/O port pins to handle all the inputs and outputs. This can be the case when for example several LCDs are driven in parallel or when it is necessary to input values from a large number of switches and pushbuttons. The circuit shown here solves the problem using the I/O port expander IC type MAX7301 from Maxim.

Relevant websites

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http://datasheets.maxim-ic.com/en/ds/MAX7301.pdf

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Magazine July/August 2009
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Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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