Other Parts Discussed in Thread: BQSTUDIO
Tool/software:
Hi Alan and TI support team,
I’ve successfully performed the ChemID setup on a new board, and everything was proceeding smoothly during the learning cycle. I configured the data memory properly and began the full charge phase. Once the battery was fully charged and the relaxation phase completed — with Update Status and Qmax updating correctly — the system was ready for the discharge phase. However, as soon as I unplugged the charger to begin discharging, the fuel gauge IC lost power again.
I suspect this issue may be related to changes in the Bit Registers. Initially, the FETs behaved as expected after sending the FET_EN command early on. After the full charge and relaxation stage, the RDIS bit cleared, OCV was captured, and the system was ready to update the resistance table during discharge. Because the IC lost power at this point, I had to manually disable FET_EN and send the DSG_FET_TOGGLE command to turn on the DSG FET. This worked, and I confirmed that the Ra Table was being updated .
However, once the discharge reached the termination voltage, the DSG FET turned off and the IC lost power again. As a result, the final relaxation stage couldn’t be completed.
I also noticed something that might help diagnose the issue. Initially, when the IC was functioning properly, I measured the voltage on the PBI pin (Pin 10), and it matched the voltage on VC2 (Pin 11). But when the power loss occurred, the voltage on PBI dropped to 0V or a floating value (around 0.5V). This suggests that the internal connection between VC2 and PBI might be affected — potentially due to register configuration.
Could you please help me resolve this issue? It’s been quite time-consuming and is preventing successful completion of the learning cycle.
Thanks again for your continued support,
