Other Parts Discussed in Thread: BQSTUDIO, GPCCEDV, EV2400
Tool/software:
Hello,
We are using BQ27220 to Monitor the SoC (State of Charge) and Voltage of 900 mAh battery, based on the battery specifications and the technical reference manual of BQ27220 we are configuring these values.
Full Charge Capacity : 900 mAh
Design Capacity : 900 mAh
Design Voltage : default : 3700 mV
Charge Termination Voltage : default : 100 mV
we are writing these values through I2C interface. Below we have listed the battery specification on which we have done the testing. It is a LiPo battery.
Battery Chemistry : LiPo
Nominal Voltage : 3.7 volt
Design Capacity : 900 mAh
Max. Charge Current : 450mA
Standard Charge Current : 180mA
Discharge Current : 900mA
Standard Discharge Current : 450mA
As we didn't use learning cycle to get the configuration data for the fuel gauge, we have configured it on the basis of battery specifications.
we mainly had changed battery design capacity which is 900mAh, and tried many different configurations but we observed that the value of remaining capacity and SOC is changing too slow.Besides this it shows approximately correct value for SOC when we restart or re-configure any profile value but then it gets to stuck again as it changes remaining capacity too slow. As we are getting accurate values for voltage, and FCC after update.
So, can you please tell us if we are missing something or there is need for this gauge to go through a learning cycle for accuracy?