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BQ76940: Is it safe to continuously give CHARGE and DISCHARGE FET turn on command?

Saurabh Biswas
Prodigy 30 points
Part Number: BQ76940

Currently I am developing BMS with bq76940.

I know once we give command to turn on charge and discharge FET (SYS_CTRL2), it be stay turned on only until any fault occurs, but i want to know, since we get fresh reading every 250ms from AFE, will it be safe to give command to turn on charge and discharge FET every 250mS, even though it turned on in the first command itself?

Thanks.

  • 0
    TI__Guru 54715 points

    Hi Saurabh,

    The FET on command bits are register bits and may be written as desired.  If a fault persists it will prevent the bit from staying on, so be prepared for that condition.  If you are clearing faults before your periodic write, you may see the FET come on and the fault re-occur. Be sure you have a good algorithm for your control.

  • 0 in reply to WM5295
    Prodigy 30 points

    Hi WM5295,

    Thanks for the reply, Fault conditions are taken care of, but what i wanted to know is once charge/discharge is turned on, and no fault conditions are present, is it safe to keep writing the registers to turn on again and again...

    Thanks.

  • 0 in reply to Saurabh Biswas
    TI__Guru 54715 points

    Hi Saurabh,

    Yes, it is a register, it can be written as desired.  It does not have a wear out characteristic like some memory might have.