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BQ76952: How to let ALERT PIN to low level?

Statham Su
Genius 4990 points
Part Number: BQ76952

Hello Sir:

We know that ALERT pin will be high level when fault condition.

But after clear fault condition how to let ALERT PIN to low level?

We tried to send command 0x62 to 00, but it's no work, ALERT PIN is still high.

Please help to provide recommendations for us.

Thanks a lot.

  • 0
    TI__Prodigy 720 points

    Hi Statham,

    The ALERT PIN remains high during a fault because the Alarm Status register latches the Safety Status A/B/C bits so you will need to clear these bits. In order to clear these, you can just write back the current value of the Alarm Status register (i.e. if set to 0x5000 just write 0x5000 back to the register to clear the latched bits) so in your case you send command 0x62 with write bytes of 0x5000 for Safety Status A faults or 0xD000 for Safety Status B or C and A faults. You can also see TRM section 12.2.17 Alarm Status Register for any other combination.

    Best,

    Andrew