TCA6408A-Q1: GPIO pin can be used as INT

Jitendra kumar

Part Number: TCA6408A-Q1

I have some concern regarding with i/o Expander TCA6408AQPWRQ1 INT Pin.

Now, I want to add above 2 Switch on GPIO as input with this Expander IC and connect it with this Deserializer. for same i have some questions.

Q1. At which condition of this IC, INT pin will be toggle ??

Q2. Can we use this IC's GPIO (P0-P7) pin just like as Interrupt Pin (without polling method)??

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 265600 points

The /INT pin activates when any input pin changes. So you will get a signal when a switch is closed, or opens, or bounces; you have to read the input port register to find out what happened.

0 Jack Guan over 1 year ago

TI__Mastermind 21821 points

Hey Jitendra,

To add on to Clemens' response, the GPIO ports of this device are configured as inputs upon startup and can be used with external INT. You would need to perform an input register read when you see the INT pin being assessed. (Note that polling method would not be used since the I/O expander is a classified as a slave device).

Regards,

Jack

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TCA6408A-Q1: GPIO pin can be used as INT