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BQ27532-G1: QM doesn't get updated with having bigger battery.

Amin Rahmati
Prodigy 80 points
Part Number: BQ27532-G1

Hi TI team,

We use BQ27532G1 for system fuel gauge. I performed learning cycle, and all the related parameters are updated from there including Ra, QM, FAC, FCC, and also "update status" is 02. we need to do some tests with smaller/bigger battery than the original one to make sure the fuel gauge is capable to update the QM and trace the capacity. but only FCC changes with each charge and discharge cycle and QM and FAC don't get updated, therefore SOH status doesn't update to level 3 (I unplugged the original battery and installed different capacity battery, so SOH status goes back to 1). what are the possibilities to get this result despite I think everything should be fine in the settings.

prior to this we were using BQ27510G3, and it was updating those parameters although that was an older part.

Regards,

Amin.

  • 0
    TI__Mastermind 37761 points

    Hey Amin,

    Ideally, this will not generally work for our system side gauges. If the battery is going to be replaced, it should be replaced with the exact same type of battery previously used.

    Regards,

    Nick Richards

  • 0 in reply to Adrian
    Prodigy 80 points

    Hi Nick,

    We use the same exact type of battery with same chemical spec but bigger capacity. we have done the test also with a very used same exact type of battery that we know the capacity has been degraded but after 4-5 complete charge/discharge cycles, still QM doesn't get updated, and the SOH status doesn't reach to level 3. also, FCC and FAC are at the same learned value.
    even if we use a different battery with different chemical, the Ra table should change after going through a few charge/discharge cycles and if the gauge follows the amount of charge going to the battery, it should update some parameters, however from the learning cycle standpoint and tuning, that might not be the proper values because the fuel gauge doesn't have the sense of capturing a different battery upfront.

    with all above and our previous experience with battery monitoring, I am pretty sure the fuel gauge should update something even with a different battery. I just don't know if there is a parameter or setting can cause this.

    Regards,

    Amin Rahmati.

  • 0 in reply to Amin Rahmati
    TI__Mastermind 24741 points

    Hello Amin, 

    Nick is currently out of office, please expect a delayed response. 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    TI__Mastermind 37761 points

    Hey Amin,

    Sorry for the delay in response. I want to clarify what I said before, when I say the exact same battery I also am referring to having the exact same capacity of battery since the Design Capacity parameter in Data Memory is important for updating certain registers on the gauge. Can you send the gg file from the gauge and also send me a log file showing this behavior. I will need to see how the registers are changing to see what exactly is going on.

    Regards,

    Nick Richards

  • 0 in reply to Adrian
    Prodigy 80 points

    Hey Nick,

    is it possible to work offline on this?

    Regards,

    Amin.

  • 0 in reply to Amin Rahmati
    TI__Mastermind 37761 points

    Hey Amin,

    Yes, I have been in contact with your FAE, and we will continue this on email.

    Regards,

    Nick Richards