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BQ27421EVM-G1A: FC bit not getting Set even when the battery SOC reaches 100%

Vidyasagar Kunala
Prodigy 200 points
Part Number: BQ27421EVM-G1A

Hi,

I'm testing with BQ27421-G1A EVM using my 450mAH Battery. After programming Design Capacity to 450mAh, Design Energy to 1665mWh, Termination Volatge to 3100mV and Taper Rate to 100, charged the battery to Full. Observed that Battery Voltage is 4190mV < VBat < 4200mV & SOC is showing 100% in the Gauge GUI but FC bit is not Set.  I repeated this 1-2 more times with the same battery & with another battery also, FC was never Set. Let me know what is the reason for not setting of FC bit.

Also let me know how gauge knows when the battery is fully charged. Will it decide based on SOC alone or FC bit or both ? 

Also can you help me how I can test the accuracy of the SOC reported by the battery using this BQ27421-G1A EVM ?

Thanks

Kunala Vidyasagar