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Pin 1A & Pin 1B

225 Views - Created 19/01/2019

19/01/2019

Posted by:
TonyE

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Hi

Just curious, but what is Pin 1A and Pin 1B used for on the 20 pin headers?

Regards

Tony

19/01/2019

Posted by:
andrew

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Location:
United Kingdom

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Hi Tony

IA and IB are the two interrupt pins.  The interrupt pins can be configured to go high or low when an input either changes state or goes to a preset state.  You can find out more about how they work in the datasheet for the MCP23017 on page 24.  In the datasheet the pins are listed as INTA and INTB.

Our code libraries for the IO Pi contain all of the functions needed to configure and use the interrupt logic built into the MCP23017 IO chips.

AB Electronics UK Tech Support

20/01/2019

Posted by:
TonyE

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Hi Andrew 

as alway, many thanks for your prompt and detailed reply.

Regards

tony

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