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TCAN1043A-Q1: Battery wake up

alex dchk
Prodigy 220 points
Part Number: TCAN1043A-Q1

Hello,

I need to monitor wake up event caused by battery connection. My assumption is, that I can monitor Local Wake-Up (LWU) via WAKE Input Terminal and another way that I can use is monitor  PWRON Flag, reflected on nFAULT pin. Am I right?

  • +1
    TI__Prodigy 440 points

    Hi Alex,

    You are correct that you could monitor the PWRON Flag on the nFAULT pin. The PWRON flag is specifically triggered when the WAKE event is caused by attaching a battery, which sounds like the solution to your question. It is typical for the battery to have some connection to the WAKE pin so that connecting a battery should trigger the WAKE event, so as long as you have that, monitoring for the PWRON Flag should be all you need.
    In Theory, you could monitor for the LWU on the WAKE pin, but you would have to also monitor for the battery connection, and you would need additional logic to ensure that the WAKE event being monitored is from the battery, and the PWRON flag does that automatically, so I'd recommend sticking with that.

    Please reach out for any other Questions!
    Zach