Tool/software:
Hi Team,
For our design, we used the fuel gauge BQ27Z746YAHR and performed learning cycle to generate golden image. But during the process we didn't get some of the bits correctly as mentioned in the reference document of TI for performing learning cycle. Initially we set the Update status to "00" and after toggling the GAUGE_EN command in BQ-Studio the Update Status changed to "04". After that we started discharging and completed the next relaxation, Charging steps. But during the relaxation after charging, the Update Status didn't changed to "05" and QMAX bit didn't toggled to indicate QMAX update. In order to proceed further, we manually edited the Update status to "05". Then continued with discharging of the fully charged battery. After completing the discharging we started the relaxation state. But the REST bit didn't get high even after we waited for more than 10 Hours. The update status was supposed to be "06" or "0E" by this time. So, we again edited the Update Status to "06". And waited few hours to check whether will it be get automatically updated to "0E". But that update didn't happened. So, we performed one more Charge-Relaxation-Discharge cycle mentioned in the reference document. But that also didn't give any updates .After keeping the battery in 1 hour relaxation we manually edited the Update status to "0E". We kept the battery in that state for half an hour and completed the learning cycle by generating the Golden Image.
Could you please help us to identify why we didn't get the proper bit updates in BQ-Studio and to find out if there are any errors happened during the process?
- During discharging, we varied the discharging current from 300mA to 20mA to discharge the battery to termination voltage. Because while discharging the battery using C/5 rating (300mA), to termination voltage 3140mV and after observing the battery voltage below 3140mV in BQ-Studio we stopped discharging. After stopping discharging the battery voltage displayed in BQ-Studio is suddenly increasing to 3.3V or 3.2V which is very high compared to 3140mV. Because of that we reduced the discharging current to make the voltage displayed in BQ-Studio to remain below termination voltage even after ending discharging. Does the above mentioned method is correct for discharging or can you please let us know which is the correct method for discharging?
Please find the attached Log file generated during the entire learning cycle and gg file generated after completing the learning cycle for reference
The Chem ID used in the process is : 3759
Battery Details : 3.7V, 1500mAh, Li-Po Battery
The reference document used is : SLU903 ( Achieving the Successful Learning Cycle ) by TI.
