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Original question:

TCA9555: Circuit review

TCA9555: May we can fix Interrupt (INT) Output generated by rising only of the port inputs in the input mode?

Chen Bogey8
Mastermind 9990 points
Part Number: TCA9555
Other Parts Discussed in Thread: TCA6418E

Hi Sir 

May we can fix TCA9555 Interrupt (INT) Output generated by  rising  only(or falling only) of the port inputs in the input mode?

or is there have P2P part have this kind function?

                                                                                Bogey

  • 0
    TI__Guru 73631 points

    Hey Bogey,

    "May we can fix TCA9555 Interrupt (INT) Output generated by  rising  only(or falling only) of the port inputs in the input mode?"

    Unfortunately not, this IO expander's INT circuitry is hardwired insuch a way that it will not allow for you to do this.

    "is there have P2P part have this kind function?"

    Most of our IO expanders use this same design so we have limited options. TCA6418E looks to be able to support this but it is not pin to pin.

    -Bobby