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bq27520-G4 / Update condition of FCC

K.Yaita
Guru 29690 points
Other Parts Discussed in Thread: BQ27520-G4

Hi Team,

I was aked when FCC is updated with bq27520-G4 by my customer.
Is the following application note page 5 "2.6 Update of DataRAM.Remaining Capacity (RM) and DataRAM.Full Charge Capacity (FCC)" applicable for bq27520-G4?
http://www.tij.co.jp/jp/lit/an/slua450/slua450.pdf

Best Regards,
Yaita / Japan disty

  • 0
    TI__Expert 3990 points
    Hi Yaita-san,

    We'll try to have someone respond to you when we're back in the office on Monday.

    Thanks,

    Terry
  • 0 in reply to -Terry
    Guru 29690 points

    Hi Terry-san,

    Thank you for your support.
    I will wait for your team's reply.

    Best Regards,
    Yaita

  • 0
    TI__Guru 51346 points
    The gauge calculates unfiltered FCC at the following events:

    * after a full reset
    * charging:
    - start of charging
    - charge termination (cell full)
    * discharging:
    - start of discharge
    - DOD crosses grid point
    - fast Qmax at end of discharge
    * change in temperature > DODatEOCTempDelta
    * state of health update
    * relax:
    - when OCV measurement is taken
    - Qmax updates

    If smoothing is enabled, filtered FCC will update:
    * after a full reset
    * charging:
    - continuously
    * relax:
    - if RCJumpOk = 1 and change in temperature > DODatEOCTempDelta
  • 0 in reply to Dominik Hartl11
    Guru 29690 points

    Hi Dominik-san,

    Thank you for your kind support.
    I understood FCC update events are different between SMTHEN=1 and SMTHEN=0.

    1)
    Is there any application note that explain the difference in detail?

    2)
    My customer found FullChargeCapacity( ) is suddenly changed to the value of RemainingCapacity( ) at charge termination under SMTHEN=1(smoothing is enabled).
    Is it normal operation for bq27520-G4?

    Best Regards,
    Yaita / Japan disty

  • 0 in reply to K.Yaita
    TI__Guru* 76230 points

    1. The TRM described the smoothing fuctionality. That's all we have.

    2. Yes this is normal. Pls see the charge termination section of the TRM

    thanks

    Onyx