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BQ34Z100-G1: CC Offset / Board Offset

Yoshinobu Kagawa
Expert 2030 points
Part Number: BQ34Z100-G1

Questions from customer.

I'm thinking of doing CC Offset and Board Offset at system board.
I understand that the Sense resistor should ideally be in a state where no current flows, but there is also consumption due to the voltage dividing resistor, leakage current from the AC adapter path, etc. It cannot be set to 0 without cutting.
I am wondering how much I should reduce it, so can you give me a sense of the degree?
Is 400uA or 200uA acceptable?
Or is it better to cut the pattern and get closer to 0?

How does the variation of CC Offset and Board Offset affect the measurement performance?
What are the units? Is there a guideline such as the allowable value of variation?
For mass-produced machines, we are trying to apply the average value of each parameter obtained by pre-calibration uniformly without calibrating each equipment.For example, if the CC Offset variation is ±50, 50 I want to get a feel for how a device that is out of alignment works.

Best regards,
Kagawa

  • 0
    TI__Guru** 105740 points

    Hello Kagawa-san,

    The calibration can be done with very small current flow depending on the sense resistor, it's always best if there is 0A flowing but there will always be some small amount of current flowing. The divider network can also be triggered using the VEN pin to reduce current flow. If they can they should reduce current as much as possible.

    The units for the offsets and gain are defined in the TRM, some of them are unit less because it is modifying the raw ADC value. You can calibrate a few of the gauges for all the offsets and gain values and average them together to make your final golden image.

    Sincerely,

    Wyatt Keller