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Original question:

BQ76930: Coulomb Counter ADC calibration

BQ76930: Coulomb counter has wrong reading with fixed bias

dazhuang zhang
Prodigy 100 points
Part Number: BQ76930

Hello to all, 

I am making my 8S BMS with BQ76930 AFE connecting to an MCU. It works most of the time fine, but once in a while about serial days, it has wrong reading on the coulomb counter. The reading seems biased around 0.8A, and the raw digit reading from CC_HI (0x32) and CC_LO (0x33) varies with a minimum of 10 counts. After a ship-mode reset, the reading becomes normal again. What could be the issue causing this phenomenon?

Thank you very much.

  • 0
    TI__Guru 54715 points

    Hi Dazhuang,

    Check the CC_CFG register (address 0x0B) when the output has shifted, be sure it is still set to 0x19.  If it has been cleared or set to an odd value it can cause an output shift.  If it is changed then you must determine what has caused the change and correct it.

    If the register has not changed, check the REGOUT voltage and look for noise or voltage shift.  Also check for unexpected transients on REGOUT during operation which may upset operation. 

  • 0 in reply to WM5295
    Prodigy 100 points

    Thank you for the advice.