Tool/software:
The problem I'm experiencing that the SoC reported by the the BQ27421-G1A EVM report around 2-3% SoC when there is in fact 20+% SoC for a battery. The steps to arrive at this situation is:
- Cold boot the evaluation board with battery at the noted state (3.546V or and about 20% SoC).
- Load Golden Image configuration from file to Battery Studio.
- Programming the golden sample image information (Ra Table, QMAX) results using Battery Studio and EVM2400 - Write All button.
- Soft reset the FG using Battery Studio and EVM2400.
- Scan FG and SoC shows 3% and open circuit voltage is 3.564V.
The following is my configuration
QMax Cell 0 = 16597
Reserve Cap-mAh = 0
Load Selection/Mode = 0x81
Q Invalid MaxV = 3803 mV
Q Invalid MinV = 3752 mV
Design Capacity = 200 mAh
Design Energy = 740 mWh
Termination Voltage = 2950 mV
T Rise = 20
T Time Constant = 1000 s
SOCI Delta = 1
Taper Rate = 100
Taper Voltage = 4100 mV
Sleep Current = 10 mA
V at Chg Term = 4194 mV
Ra Tables:
R_a0 0 =65 R_a0 1 =65 R_a0 2 =55 R_a0 3 =58 R_a0 4 =43 R_a0 5 =57 R_a0 6 =94 R_a0 7 =94 R_a0 8 =81 R_a0 9 =74 R_a0 10 =89 R_a0 11 =107 R_a0 12 =216 R_a0 13 =569 R_a0 14 =904
The battery datasheet is attached
