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BQ35100: BQ35100: What does Board Offset mean? and how it is calibrated?

Marwan Khalid
Prodigy 171 points
Part Number: BQ35100
Other Parts Discussed in Thread: BQSTUDIO

Dears,

I am trying to understand the calibration process of "Board offset",

First Question what is Board offset, i think it is related to the PCB,but could you please explain what it really is??

the second question is that CCA bit will never be set, so the condition will always be false, is that correct?

as mentioned in the TRM the flow as the following:

I was also checking the I2C bus while Bqstudio calibrating the Board_offset,

when Bqstudio sends the CONTROL_STATUS() the CCA Bit is never set.

either the TRM is not clearly showing the the real flow or I'm missing something.

  • 0
    TI__Guru** 105760 points

    Hello Marwan,

    The Board Offset is not used very often, it is only needed if you have a known offset on the SRN/SRP inputs to the gauge from any board related issues. It should be fine if only BCA is set during calibration for board offset, I would only calibrate the CC gain, CC offset, and CC delta for calibration.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 171 points

    Thanks !

    "it is only needed if you have a known offset on the SRN/SRP inputs"

    - Do you mean offset current, voltage, or both?

    What about the condition of "CCA==1 && BCA ==1" in the above figure ?

    as this from my understanding will never be true!

  • 0 in reply to Marwan Khalid
    TI__Guru** 105760 points

    Hello Marwan,

    Current is the voltage difference between SRN/SRP, both are the same, the gauge correlates the voltage offset from SRN and SRP to current flowing.

    You should only reference BCA during board offset.

    Sincerely,

    Wyatt Keller