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Original question:

CCS/DRV8301: DRV8301 FAULT STATUS REPORTING ISSUE

CCS/DRV8301: DRV8301 FAULT ASSERTED WHEN ENABLE CHANGES STATE

Anthony Gee
Prodigy 140 points
Part Number: DRV8301

Tool/software: Code Composer Studio

Please see the screenshots below.

When I enable/disable the DRV8301 using the EN_GATE pin (green trace), the FAULT pin momentarily changes state (yellow trace) even though there is no genuine fault condition.

Is there a way of supressing this behaviour? 

Thanks, 

Tony

  • 0
    TI__Guru** 114905 points
    Hi Anthony,

    The internal regulators (AVDD, DVDD, and GVDD) are monitored. As the device is enabled and disabled, the nFAULT assert due to the regulator voltage being too low.

    When enabling, this high to low transition indicates all regulators are valid and the device is operational.

    One workaround is to monitor/ignore the nFAULT for ~5ms when enabled, and ~40ms when disabled.