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BQ76952: How to manually clear COV Fault

Manuj Agrawal1
Prodigy 175 points
Part Number: BQ76952

Dear TI Team,

I have been using the "COV Threshold Override" setting to set the custom COV trigger point. However, given the "COV:Recovery Hysteresis" can take minimum value of 2 (i.e. 101.2mV); it is too large a hysteresis value for my application for automatic recovery from COV fault.

Since I have an onboard microcontroller, can you please suggest how the microcontroller can clear COV fault by sending any command? 

Thanks and Regards

Manuj

  • 0
    TI__Guru* 81034 points

    Hi Manuj,

    It is not possible to manually clear the bits in the Safety Status register and the COV:Recovery Hysteresis cannot be set set lower than the minimum value of 2. If you use the automatic FET control and recovery for the COV protection there is no way to modify this behavior.

    However, there are options in the CHG FET Protections A register. You could disable the COV bit in this register and use the microcontroller to send the CHG_PCHG_OFF() command when the cell voltage rises above the threshold. However, setting this bit to zero will have an effect on the FET switching time for other faults as noted in the TRM.

    Best regards,

    Matt