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BQ34110: TRM says: The system must go through a full charge and then a full discharge cycle before the correct FullChargeCapacity() (FCC) is estimated

Mark Scovel
Intellectual 595 points
Part Number: BQ34110


If the discharge ends in the system shutting down because the battery ran out of power, will the bq remember that it was in a discharge cycle at power on and resume the cycle if we start charging? Or will it forget such that we need to make sure the battery doesn’t run totally out of power?

  • 0
    TI__Mastermind 25955 points
    Hi Mark,

    In an attempt to answer the title:

    As described briefly in Section 2.7.1 CEDV Gas Gauging Operational Overview of the TRM, the FullChargeCapacity() (FCC) register represents the initial or last measured full discharge of the battery. It is used as the battery full-charge reference for relative capacity indication. The bq34110 device updates FCC after the battery undergoes a qualified discharge from nearly full to a low battery level. This is described in more detail in Section 2.7.3 Capacity Learning (FCC Update) and Qualified Discharge.

    As for the body of the post:

    The device operates in 3 different modes: relax, discharge and charge. The current modality of the gauge is determined by with respect to data flash parameters found in the Current Threshold subclass. For more information on these values and how the gauge determines which modality it is currently operating in, please refer to Section 2.7.11 Gas Gauge Operating Modes of the TRM. Please read this section carefully as the DSG flag in BatteryStatus() is slightly different from the DSG flag in GaugingStatus(), as described therein.

    Sincerely,
    Bryan Kahler