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BQ25638EVM: BQ25638EVM IBUS ADC read value

eajon chen
Prodigy 145 points
Part Number: BQ25638EVM
Other Parts Discussed in Thread: BQ25638, BQSTUDIO

Tool/software:

Hi TI team，

     When verifying the reading accuracy of BQ25638 ADC, we found that the reading accuracy of IBUS current was poor。What is the cause of this？

Our test configuration is: ADC_SAMPLE  11bit effective resolution。 actual test value is measure the EVM R1 voltage。 I=V/R1.

Thank You！

  • 0
    TI__Guru 57391 points

    Hi,

    Are you using the BQSTUDIO to read the IBUS_ADC values?

    Thanks,

    Ning.

  • 0 in reply to Ning T
    Prodigy 145 points

    Hi Ning，

     Yes，IBUS_ADC values read by the BQSTUDIO。

    In addition, we want to know the accuracy of the bq25638 ADC，However, on the spec of BQ25638, except for VBAT, the accuracy description of other ADCs is not available. Can you provide me with the accuracy of other ADCs?

    Thank you！

  • 0 in reply to eajon chen
    TI__Guru 57391 points

    Hi,

    The actual IBUS should be IBUS_ADC x 1.25, The GUI code will be updated in the next revision.

    The battery monitoring ADC of the device is offered as an extra feature in addition to the regular charger and is for reference only without specs. If accurate ADC measurements are needed, a gauge device is recommended.

    Thanks,

    Ning.