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BQ76PL455A-Q1: Fault Sensing Higher Up Stack

Alex Terry
Intellectual 625 points
Part Number: BQ76PL455A-Q1

Hi,

I've currently programmed a single ended BQ76PL455A-Q1 and am now looking to stack the devices, I have enabled all devices to trigger a Fault_N output if the Cell UV/OV and AUX UV faults are triggered. If these faults are triggered on a board higher up the stack will these faults automatically pass down the devices or do I have to enable the COMM_FAULT bit. Also if these are automatically passed down to the base device in the stack, is it possible to read which device triggered the initial fault?

Thanks,

Alex

  • 0
    TI__Genius 11480 points
    Alex,

    You must enable the differential fault interface for the heartbeat to pass down the stack. Typically FAULT_N is only for the base device to alert the MCU.


    The typical use is that the interrupt happens, then the MCU must go and read the fault registers to determine where/what the fault happened.
  • 0
    TI__Expert 6085 points

    as detailed  in the Fault signaling section of the D/s,

     The ICs sense this condition in the stack below and then

    assert the FAULT_N pins if configured to sense the lack of tone in COMCONFIG. FAULT_N only asserts if the

    UART_EN bit in COMCONFIG is set.

    hope this helps out.