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BQ27421-G1: How to improve dischrging SOC accuracy?

peter cheng
Prodigy 70 points
Part Number: BQ27421-G1

Tool/software:

Dear Sir,

we measure the charging and discharging curve, and found the discharging curve is not linear. We would like to improve the accuracy.

The doc sluuah7b mentions that "this pre-optimized golden file allows the end user to experience higher initial accuracy out of the box without having to wait for the gauge to learn during operation".

Is there any SOP to output the pre-optimized golden file or it needs TI local FAE support?

  • 0
    TI__Mastermind 24931 points

    Hello, 

    I do not see any issues with the SOC reported by the fuel gauge. The battery capacity is not linear. I recommend ensuring that you have successfully completed the learning cycle. 

    Regards, 

    Robert. 

  • 0 in reply to Jonny
    Prodigy 70 points

    Dear Robert,

    the test is keeping system display on  and idle only, so the target discharging SOC should be like the red line.

    The doc sluuah7b mentions that "this pre-optimized golden file allows the end user to experience higher initial accuracy out of the box without having to wait for the gauge to learn during operation".

    so we would like to make the pre-optimized golden file, please let us know how to do it.

    BR

    Peter

  • 0 in reply to peter cheng
    TI__Mastermind 24931 points

    Hello Peter, 

    This you are referring to would still require you to perform a charge-relax-discharge-relax cycle and ensure that you have received Qmax and resistance updates. 

    Regards, 

    Robert. 

  • 0 in reply to Jonny
    Prodigy 70 points

    Dear Robert,

    is there SOP that we can follow to make  pre-optimized golden file or we need to contact the TI local FAE

    BR

    Peter

  • 0 in reply to peter cheng
    TI__Mastermind 24931 points

    Hello Peter, 

    I do not have a document I can refer you to for this. I recommend programming the fuel gauge for your specific application, then performing the learning cycle to obtain the golden image. This will produce the most accurate gauging results. 

    Regards, 

    Robert.