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BQ27421-G1: bq27421-G1 / FC bit is not set

S.Satoshi
Guru 21685 points
Part Number: BQ27421-G1

Hi,

Now I'm evaluating bq27421EVM to perform charge and discharge cycle as attached. And then I found that the FC bit is not set though the SOC actually reach 100%. Can you check attached log data and point out incorrect setting if I have?

bq27421 LearningCycle_FC bit.xlsx

Best Regards,

Satoshi / Japan Disty

  • 0
    TI__Intellectual 1840 points
    What have you set your "Taper Voltage" to be ? Try to set the "Taper Voltage" 100mV below the battery's charging voltage, and set the "V at Chg Term" 10mV below the battery's charging voltage. So in your case, set Taper Voltage to be 4100mV and V at Chg Term to be 4190mV.

    And set "Taper Rate" to be = Design Capacity / (0.1 * Taper Current)

    Try to see if that works.