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TIC12400-Q1: IN_STAT_COMP can be latched?

Daniel Wang (auto)
Expert 3500 points
Part Number: TIC12400-Q1

Tool/software:

Hello team,

There is a usage situation, MCU need to check the source/channel after being waked up, checking the datasheet, the IN_STAT_COMP can report individual channel states, but it cannot be latched until read, for example, if a switch was pushed and released, the IN_STAT_COMP will record nothing, and MCU can only be waked but miss the source.

The /INT scheme can only latch INT_STAT register and /INT pin, but cannot specify which channel, so do you have any suggestions for the requirement?

Thanks

Regards,

Daniel Wang

  • 0
    TI__Guru 74252 points

    Daniel,

    This product is now owned by the INT-TXP group, and I've moved the post to their forum.

    Regards,

    Eric Hackett 

  • 0
    TI__Mastermind 22280 points

    Hello Daniel,

    We are looking into this and will respond shortly.

    Regards,

    Josh

  • 0
    TI__Mastermind 22280 points

    Hello Daniel,

    You are correct in stating that IN_STAT_COMP cannot be latched and INT_STAT register will flag a SSC (Switch State Change) event but cannot tell you which channel was triggered.

    The IN_STAT_COMP register will always reflect the latest status of the pins at the end of the polling cycle. For example, if the MCU does not wake up before the status changes AND a new polling cycle runs, it could miss a switch status change. 

    What I will recommend is increasing the polling cycle time long enough so channels are read after MCU wakes-up.

    Regards,

    Josh