Other Parts Discussed in Thread: BQSTUDIO, BQ25302
Tool/software:
Hello TI Team,
I am on the BQ27Z746EVM and single INR18650-26E cell trying to achieve a learning cycle as in https://www.ti.com/lit/an/slua903/slua903.pdf document. However, I see that the gauging status update as described in this manual isn't happening in my setup despite (to the best of my observation) setting the prerequisite parameters required for a learning cycle to happen. I manual says:
In the process, the “Update Status” register should be tracked, reflecting the progress of the learning cycle:
- 0x04: Impedance Track enabled, Qmax and Ra data not yet learned
- 0x05: Only Qmax has updated
- 0x06: Both Qmax and resistance (Ra) are updated, indicating a full learning cycle has occurred and the gauge is ready for golden image extraction
After a full discharge and relax, Gauging Status changes from 0x04 to 0x45 (FD and RELAX bit high) but no changes then on until the charge completes to revert the Gauging Status to 0x04 (FC not high, RELAX but goes high). So referring to the manual which says - If the FC bit is not high after the charging ends, the cycle fails and no Q update happens. This has been a repeated case in this setup. However, I also see the Bit3 in Update Status going high and capacity update in the BQStudio dashboard is happening.
For charging, I am using custom board with BQ25302 set to 2A charging current. So are the Data Memory parameters for "Current Thresholds".
My question spans out into two as:
1. Is this learning cycle process and gauge status update process valid for my device/setup?
2. Attached is the BQStudio logs for one full Relax-Discharge-Relax-Charge cycle. Am I missing anything in the process?
Thank you and looking forward to discuss about this in detail.
