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DRV8718-Q1: question about DRVOFF/nFLT pin and IC_STAT1[FAULT] bit

Jay wang
Intellectual 2301 points
Part Number: DRV8718-Q1

Tool/software:

hi expert

as we know, DRVOFF/nFLT pin is a multi-function pin and, by default, the pin functions as a global driver disable pin.

additionally, 8718 has IC_STAT1[FAULT] bit to Mirrors nFAULT pin.

So my question is that in default configuration(DRVOFF function) what is IC_STAT1[FAULT] bit function? does this pin shown DRVOFF/nFLT state?

  • 0
    TI__Intellectual 2301 points

    Adding a question:

    how to understand FAULT bit "Mirrors nFAULT pin."

    if nFAULT pin is 1, then FAULT bit is 0;

    if nFAULT pin is 0,then FAULT bit is 1?

    am i right?

  • 0 in reply to Jay wang
    TI__Mastermind 27625 points

    Hi Jay,

    Jay wang said:
    So my question is that in default configuration(DRVOFF function) what is IC_STAT1[FAULT] bit function? does this pin shown DRVOFF/nFLT state?

    The FAULT bit is set if there is a fault detected in the IC operation for example an UV or OV or POR. It does not reflect the status of the pin while in default DRVOFF function configuration. 

    Jay wang said:

    how to understand FAULT bit "Mirrors nFAULT pin."

    if nFAULT pin is 1, then FAULT bit is 0;

    if nFAULT pin is 0,then FAULT bit is 1?

    am i right?

    Yes you are correct. Thank you.

    Regards, Murugavel 

  • 0 in reply to Murugavel4637
    TI__Intellectual 2301 points

    hi expert

    i have a further question about this words:

    Murugavel4637 said:
    It does not reflect the status of the pin while in default DRVOFF function configuration.

    so if DRVOFF/nFLT is used for DRVOFF function. and designer make DRVOFF low So IC_STAT1[FAULT] will be 1 during NO UV or OV or POR situation, right?

  • 0 in reply to Jay wang
    TI__Mastermind 27625 points

    Hi Jay,

    Jay wang said:
    so if DRVOFF/nFLT is used for DRVOFF function. and designer make DRVOFF low So IC_STAT1[FAULT] will be 1 during NO UV or OV or POR situation, right?

    The IC_STAT1 FAULT bit will be 0b, for no faults detected. When there is a fault detected the FAULT bit in IC_STAT1 will be 1b, indicating a fault is present.

    DRVOFF function for the pin is an independent input function to enable and disable the output bridges. It will not affect the IC_STAT1 FAULT bit status.

    Regards, Murugavel