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BQ27541-V200: AverageCurrent()

Yoshinobu Kagawa
Expert 1810 points
Part Number: BQ27541-V200

Questions from Customer

1. After delivery of bq27541-v200, there are many ICs that can read AverageCurrent of 11mA or more at no load with no change of DataFlash. Is it OK?
2. In other words, is the AverageCurrent value inaccurate only after calibration has been performed?

Best regards,
Kagawa

  • 0
    TI__Guru 52115 points

    Hi Kagawa,

    Bascailly, calibration is necessary before creating a golden image.

    See the app note below.

    http://www.ti.com/lit/an/slua504a/slua504a.pdf

    Andy

  • 0 in reply to Andy Liu (BMS)
    Expert 1810 points

    Hi Andy-san,

    Questions from customer.

    1. When I read AverageCurrent () with no current flowing before performing Calibration, I was able to read 5mA to 12mA with an IC whose AverageCurrent was not 0mA.
    In the first operation after shipment, is it normal to read 5 mA to 12 mA before performing Calibration?

    2. If they are calibrated, can they be used as normal products?

    Kagawa

  • 0 in reply to Yoshinobu Kagawa
    TI__Guru 52115 points

    1. When I read AverageCurrent () with no current flowing before performing Calibration, I was able to read 5mA to 12mA with an IC whose AverageCurrent was not 0mA.
    In the first operation after shipment, is it normal to read 5 mA to 12 mA before performing Calibration?

    [Andy] It is normal to see a few mA current with default calibration settings.  I would suggest they perform a calibration and double check.

    2. If they are calibrated, can they be used as normal products?

    [Andy] To achieve the optimal accuracy, calibration is necssary.

    Andy