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Full Charge Capacity

avraka
Intellectual 855 points
Other Parts Discussed in Thread: BQ20Z80, BQ20Z90

Dear Tier,

My customer used BQ20Z80+ICR18650-25F in the prior project.
Currently she is designing a combination of BQ20Z90 + ICR18650-30A(Cell).

I have two questions.

1. Is it available to modify FCC or RC value by firmware? In my thought, those values are automatically calculated by BQ20Zxx, so we cannot modify them. Am I right? If we can change, how can I do?

2. My customer faced the FCC value cannot reach 100% in the combination of BQ20Z90+30A when she use the same firmware with BQ20Z80+ICR18650-25F. It seems to be due to the difference of FCC minimum variation : BQ20Z80 of 35mAh and BQ20Z90 of 200mAh. Under the current design status, firmware change is not possible. So she want to know how to reach the 100% of charge status without firmware change. Is there any solution to solve this issues in the battery side?

I need your reply ASAP.

Best regards

  • 0
    TI__Genius 10225 points
    1. No, only the gauge can modify FCC and RC.
    2. The reason for this is because the cells are different capacity and likely have a different chem ID. For the ICR18650-30A, the chem ID should be 309. A new learning cycle would then need to be performed in order to ensure accuracy.
  • 0 in reply to Chase7071949597
    Intellectual 855 points
    Great thanks.

    She have one more questions about BQ20Z90DBT.

    Issues : FCC is continuously updated during discharge
    Request : She want to update FCC only in case of increasing cycle count and/or fully charging. Please let me know how to solve.

    Thanks