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BQ78350-R1: The setting of Gauge after GPC learning is finished

Yan Yu Tuan
Prodigy 160 points
Part Number: BQ78350-R1
Other Parts Discussed in Thread: GPCCEDV, BQ78350

Tool/software:

Hi TI team,

I upload file about GPC data file.

GPCCEDV sent report result to me.

Please check with the attachment.

Config-report(0705).zip

From the related documents of BQ78350, I confirmed that SOC error % = 0.

I need to adjust FitMaxSOC and FitMinSOC, and then upload it to GPCCEDV.

How do I set these two parameters?

Regards,

Peter

  • 0
    TI__Guru 61006 points

    The FitMax/MinSOC% should be set to just above and below the voltage knee of the cell voltage at room temperature. The default values work for most applications.

  • 0 in reply to Dominik Hartl11
    Prodigy 160 points

    Hi Dominik,

    SOC starts to the drop at 7% when discharge.

    How can I adjust it?

    Attached are the log data and gg file.

    25degC 500mA dsg(0713).csvDraft gg V00 (0715).gg.csv

    Please help me confirm.

    Thanks!

    Regards,

    Peter

  • 0 in reply to Yan Yu Tuan
    TI__Guru 61006 points

    Your starting FCC was too high (2440mAh). The gauge updated this in your log file to 2430mAh so the next discharge, under the same conditions, will not show this jump. You can pre-configure FCC to 2430mAh so that this particular discharge scenario won't have this jump.

  • 0 in reply to Dominik Hartl11
    Prodigy 160 points

    Hi Dominik,

    Sorry, the log data file has undergone a cycle test, so the FCC might differ from the gg file.

    However, I believe the FCC is updated after each charge, so I think changes are unlikely.

    If this occurs in the product application, it shouldn't require adjusting the FCC each time.

    It might be due to changes in the settings or other factors.

    Please help confirm.

    Thanks!

    Regards,

    Peter

  • 0 in reply to Yan Yu Tuan
    TI__Guru 61006 points

    FCC is updated during a qualifying discharge when voltage reaches EDV2. There is always the potential for an SOC adjustment because the gauge relies on measured FCC from a previous discharge and if conditions change (load, temperature), EDV2 will change (if compensation is enabled) and FCC will change and there will be an SOC adjustment. This is the basic operating principle of this gauge. It's impossible to avoid. The gauge always lags one qualifying cycle behind. The idea is that if the application has repeatable discharge conditions, the measured FCC will be close enough to the present (and future) discharge so that there won't be an SOC adjustment.