• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 214 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ25611D: PMIC Failsafe shutdown using watchdog?

Craig Rohe1
Prodigy 10 points
Part Number: BQ25611D

I'm implementing a failsafe-POR on our battery powered system using the bq25611d. I would ideally like to use the charger's internal watchdog -> when the host cpu hangs, we need to disconnect the power. Is this possible with the bq25611d watchdog? Looks like it simply resets a few registers, reverting to default charge config, but leaves power applied. Any workarounds for this? External pins that could trigger a shutdown on watchdog etc?

  • 0
    TI__Mastermind 25800 points

    Hey Craig,

    There is not way to force this condition directly. 

    You can possibly create a latched circuit that is only reset by the MCU.

    The /INT pin of the charger will pulse when the watchdog timer, and any fault in REG09, expires. It only pulses for 256us. You can read more about /INT in section 9.3.8.2 Interrupt to Host (INT) of the datasheet for more details.

    But you could have the /INT pin tied to some latching circuit that enables or disables a power mux or load switch from your input source to the charger. But we don't have a reference design for doing this. Just an idea. 

    Regards,

    Joel H