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BQ40Z50-R2: DF parameters changed after learning cycle

赵 勇
Prodigy 120 points
Part Number: BQ40Z50-R2

Hi 

     i meet a problem about the DF parameters changed after learning cycle， and the remaining capacity（257mAh）&full charge capacity（286mAh） went abnormality when full charge, then i import the normality GG.CSV file , the value shows well：remaining capacity（412mAh）&full charge capacity（423mAh）.

     Q: why this happen ? what will caused this issue ? what do i do to verify this issue ?

      Thank you!

BR  

ZY

  • 0
    TI__Mastermind 28480 points

    Hello,

    When the Design Capacity was entered before the learning cycle, was it the -27136 value depicted above? This seems like an abnormally large value since this should be only the capacity of a single cell in the stack. This value should not be negative as well. Since this value is important for the FCC and RemCap calculations, this could be where the error is coming from.

    Also, for DSG and CHG current thresholds, are these the values that were inputted? With these values, the gauge will not detect a current as a charge or discharge until the current is greater then 18A. This value is typically much lower.

    For FD, the voltage threshold should not be negative as well. If it is negative, the FD bit will never become set.

    Regards,

    Anthony Baldino