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bq20z45-R1 OCA Not Setting when RSOCL = 1

BicycleRepairMan
Intellectual 285 points
Other Parts Discussed in Thread: BQ20Z45-R1, BQ20Z655-R1, BQ20Z65-R1

Hi

I am having a problem getting the OCA to set on a BQ20z45-R1 based battery when RSOCL = 1.  It seems that because the RM and RSOC are limited to 99% until a valid charge termination occurs that the over charged condition is not being detected.

I have attached two log files, one with RSOCL set and one with it cleared.

Over Charge Capacity is set to 50mAh.

I can send the dataflash settings separately if required (they are confidential).

Is it possible to get an OCA when RSOCL is set?


Many thanks

Steve

0020.OCA Test - OCA 50mAh RSOCL=1 - 2014-03-17.log

5557.OCA Test - OCA=50mAh RSOCL=0 - 2014-03-17.log

  • 0
    TI__Intellectual 2650 points

    Hi Steve,

    for OCA to occure the internally counted Remaining Capacity must exceed the Full Charge Capacity by the Over Charge Capacity amount , but since setting RSOC =1 holds the remaining capacity to a max of 99% of the full charge capacity until this primary charge termination then clearly cannot happen.

    Mike

  • 0 in reply to Mike Ewer
    Intellectual 285 points

    Hi Mike


    Thanks for your answer.  I think this needs including in the technical reference manual for the BQ20Z45-R1 since there is no link between OC, OCA and RSOCL.

    Does the BQ20Z65-R1 and BQ20Z655-R1 operate in the same way?

    Many thanks

    Steve