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Remaining capacity(RM) increase itself while no charging current Bq060AE619

J.C Chen
Expert 1285 points

     Hi,everyone

     Recently, I met some problems in bq2060a-E619

1. Remaining capacity(RM) increass itself while there is no charging activity.....Max error is 8%..

2. Remaing capacity(RM) doesn't update( doesn't increase, just keep 0 mAh) while apply charging current to the battery. Max Error is 100% ..RM is 0mAh..

  Any ideas?  who can help me to solve these problem?

    Best regards

J.C chen

  • 0
    TI__Intellectual 940 points

    Hello Mr. Chen,

    If RM increases while there is no charge or discharge current, then VFC offset calibration is incorrect.  Please perform the VFC offset command by writing data 0x0653 to Address 0x00 and then wait for at least 20 minutes for the calibration to complete.  You can also use the TI evaluation software to initiate the VFC offset calibration by going to the Calibration tab.

    MaxError will be initialized to 100% when there has been no learning cycle.  MaxError is set to 8% if there is a learning cycle and the learned capacity is not within the +512/-256 mAh limit from the previous value.  An additional learning cycle with resulting FCC change within these limits will allow MaxError to be set to 2%.

    It does not make sense that RM should not increase while charging if RM does increase while not charging.  Perhaps this is an issue with a different battery than the one where RM does not increase with charging, since you say MaxError is 100% instead of 8%.  You may have the connections to B- and P- reversed (or SR1 and SR2 connections to the sense resistor reversed), so that a charge current is going through the sense resistor in such a direction that SR1 is more positive than SR2, indicating a discharge.  RM will not count to less than 0.

    Bill

  • 0 in reply to Bill J10799
    Expert 1285 points

    Hi, Bill

     Thank you for your quick response..

    In fact,  RM doesn't not increase while charging (Some battery's RM don't decrease while discharging, at last RM just directly jump from FCC to 0 )  is just some batterys in mass production...I am very sure  that the connections to B- and P- are correct...

    In addition. Cycle count sometimes jump to another valus(not one, eg:32 ..51...) while just ond full discharging..

    I'll follow your advise to recalibrate VFC offset all the batterys and relearnig..

    Best regards

    J.C Chen.