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DRV8823-Q1: DRV8823-Q1 fault detect

Eric Shen42
Expert 2750 points
Part Number: DRV8823-Q1
Other Parts Discussed in Thread: DRV8823

Dear TI:
    DRV8823-Q1 has the fault protection circuit, but no fault pin output, if customer want to sent a signal to MCU when DRV8823 fault, is there a way to do that？

    Thanks！

Regards！

Eric Shen

  • 0
    TI__Guru** 114905 points
    Hi Eric,

    Unfortunately, there is no easy way to do so.

    If the customer is willing to add circuitry, it may be possible. The additional circuitry would be up to 8 diodes and a few resistors, but could be reduced depending on the application.

    Please let us know if the customer is willing, and we can propose a possible solution based on the application.
  • 0 in reply to Rick Duncan
    Expert 2750 points

    Hi Rick:
        Thanks!

        Can  you help to give a reference design of the "additional circuitry for fault detect" ?

    Regards!

    Eric Shen

  • 0 in reply to Eric Shen42
    TI__Guru** 114905 points
    Hi Eric,

    There is no reference design, but I will put together a proposed circuit and provide it by Wednesday.
  • 0 in reply to Rick Duncan
    Expert 2750 points
    Hi Rick:
    Thanks a lot!
  • 0 in reply to Eric Shen42
    TI__Guru** 114905 points

    Hi Eric,

    Please see attached schematic. The number of outputs connected to the Outputs_Active net depends on the application.

    If only one coil will be used at a time, all outputs will probably have to be connected.

    The capacitor is optional and creates a RC small filter.

    If a overcurrent or overtemperature fault occurs, the Outputs_Active net drops to a logic low. If the GPIO is used as an interrupt, this will identify a fault.

    This circuit has not been confirmed.

     

    I hope this helps.