Other Parts Discussed in Thread: BQSTUDIO, BQ78350
Tool/software:
Hello!
I have a problem with cell balancing at rest with bq78350R3. I have a 15S LiFePO4 battery where cell balacing at rest is necessary.
* bqz Device Number 1E9B
* bqz Firmware Version 3.00
* bqz Build Number 31
It is activated in the balancing configuration. When using the Read-Word Function 0xB1, it returns 1, so it is actived. I also tried to deactivate and activate again with this command, but nothing changed. I also tried the Reset-Command and Power-On-Reset. The command always returns 1 but it doesn't work.
This is the Cell Balancing Configuration and the current Cell Voltages:
I can't see a reason why the cells are not balanced. On the PCM, there are LEDs added to the balancing resistors, that it's visible if cells are balanced. This works normally during charging, but not at rest. I also checked that the current is below Quit Current and Chg Relax Time has passed.
As shown in https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1289639/bq78350-device-fw-r3-cell-balancing-at-rest I have also treid CB_TEST_EN by setting it in Mfg Status Init or with CellBalanceToggle() (0x001B).
I've checked all points to this topic that I found in the E2E Forum but couldn't find a solution. Please help me solving this problem.
Thank you!