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BQ40Z60: Qmax not updated on Fast Qmax update procedure

Part Number: BQ40Z60


In our use case, We not able to get two DOD reading since our intensive usage. I read  SLUA997, I knew if Fast Qmax update only need one DOD0 calculation obtained from relaxed OCV reading.

In our experiment environment, we are doing some procedure to get Fast Qmax update only from one DOD reading. our procedure are:

  1. Charge battery pack until VCT
  2. Wait OCV reading until REST flag set
  3. Discharge battery pack until <10%
  4. Stop discharge and read QMAX value

But from the above procedure, I can't make QMAX updated. Is there somebody could explain what happening here?

Here is our charge-discahrge graph:

I also attached the logs48a-230921-log1.xlsx