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Original question:

BQ40Z50-R1: OC Flag & Internal Charge Counter

BQ40Z50-R1: OC Flag & Internal Charge Counter

Edgar Quintero
Prodigy 50 points
Part Number: BQ40Z50-R1

Hello,

We currently use the bq40z50-r1 in one of our batteries. About 10% of fresh new batteries are experiencing an OC condition. It seems that the OC condition only occurs during the very first charge cycle (at 99% SOC) and never appears after that. Our OC settings are as follows:

Threshold: 200mAh

Recovery: 2mAh

RSOC Recovery: 90%

RSOCL is set

The conditions for an OC flag to set are as follows: 

RemainingCapacity() ≥ FullChargeCapacity() AND Internal charge counter ≥ OC:Threshold

We are not able to find much information regarding the internal charge counter. Does this counter begin once RemainingCapacity == FullChargeCapacity? When does the counter reset?

Thanks,

Edgar

  • 0
    TI__Mastermind 24870 points
    Hello Edgar,

    The internal counter accumulates as soon as RemCap >= FCC. We set the [ALERT] OC once the internal accumulator is > 0.

    The internal accumulator is cleared once the internal accumulator goes above the over-charge threshold and we throw a PF on OC.

    We also clear the internal counter upon recovery from the PF condition. In this case, the SOC has to go below the SOC threshold for OC or the internal accumulator has to decrease by the Over Charge Recovery capacity.