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BQ25622EVM: ADC calibration

G Cant
Intellectual 325 points
Part Number: BQ25622EVM
Other Parts Discussed in Thread: BQSTUDIO

I am using the EVM for testing this part. I am configuring and analysing registers from BQStudio. 

What is the tolerance for the ADC? When charging and discharging the battery with a power source and an electronic load I am NOT getting an accurate visualization of the current flowing in and out of the battery. The deviation is very big from the real current consumption.

How can I calibrate the component or the ADC so the readings are accurate?

Thank you very much.

  • 0
    Intellectual 325 points

    If you can also tell me the expected tolerance/deviation for voltage, current and temperature it will be very helpful.

    Thank you

  • 0 in reply to G Cant
    TI__Guru 50981 points

    Hi,

    The battery monitoring ADC of the device is offered as an extra feature in addition to the regular charger and is for reference only. Due to the ADC’s intended use as a reference only there's no specification on its accuracy. If a customer requires accurate ADC measurements, a gauge device is recommended.

    Thanks,

    Ning.

  • 0 in reply to Ning T
    Intellectual 325 points

    Hello Ning,

    Is it possible to measure the ADC's output and make a calculation that fixes its deviation?

    Is this deviation always the same?

    What can affect this reading? I want to use it so I don't need a Gauge.

    What is the difference between using the Gauge and an ADC of a microcontroller, if I already got my Voltage to SOC table from a Gauge?

    Thank you

  • 0 in reply to G Cant
    TI__Guru 50981 points

    Hi,

    As mentioned earlier, an ADC is a function of gauge. If ADC specs are needed, please use gauge. The charger offers ADC as an extra feature and is for reference only without specs.

    Thanks,

    Ning.