IO Expander, PCA9555N

Datasheet PCA9555N

 

 

I'm not really sure why I bought this IO expander chip.  It was certainly a mistake ordering a chip this wide.  The benefits of the chip are the ease of adding a lot of digital IO's with very little overhead.  The I2C interface makes putting a lot of these on a board very easy.  My first test with this chip can be seen below.

 

 




My test code:


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