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BQ78350-R2-DEVICE-FW: Problem with parameter setting, the learned full charge capacity decreases by value we set in FCC learn down

Lauren Mayfield
Expert 7925 points

Part Number: BQ78350-R2-DEVICE-FW

Hi,

I'm posting this question on behalf of my customer. It appears they're having trouble with the EVM of the BQ78350-R2.

we have a problem with the parameter setting of BQ78350-r2.

After each cycle the learned full charge capacity decrease by the value we set in FCC learn down. 

The design capacity is 15042 mAh. Normally the pack capacity should be about 1000 mAh above this value, but every time we discharge the pack the learned full charge capacity drop by the specified FCC learn down.


What can be done to correct this?

Thanks,

Lauren

  • 0
    TI__Mastermind 42535 points

    The 78350 is a CEDV gauge. Your FCC will update when the RSOC has met learn threshold specified by EDV2 voltage. Once the curve fitting is done per the CEDV algorithm, the capacity adjustment is done. If the adjustment is greater than FCC learn down, it will be reduced by FCC learn down.