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BQ76952: Discharge control not available

oh changhyun
Prodigy 40 points
Part Number: BQ76952
Other Parts Discussed in Thread: BQSTUDIO

Tool/software:

LFP Battery ,4S 

In the CUV state, the BQSTUDIO indicates that the FET operates normally, but the discharge continues even after it has actually become CUV. Please tell me the solution

  • 0
    TI__Intellectual 780 points

    I am having trouble viewing some details of the schematic when I zoom in, even when I download it first. Could you try uploading a higher resolution image of the schematic?

    A couple questions to help understand and debug your issue:

    1. What is the voltage of the DSG, CHG pins compared to the PACK, BAT+ nets? Is there a charger or load attached at the time?

    2. What is the CUV threshold and delay setting and the measured voltage of the cell that triggers this? Can you confirm the CUV fault status is still active, when discharging continues?

    3. Could you provide a list of the CHG/DSG FET and Protections register settings?