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BQ76907-Q1: During the cell balancing process of BQ76907, are the MOSFETs on the DSG and CSG turned on or off?

Alon Chen
Intellectual 390 points
Part Number: BQ76907-Q1
Other Parts Discussed in Thread: BQ76907

Tool/software:

Hi Team，

During the cell balancing process of BQ76907, are the MOSFETs on the DSG and CSG turned on or off? I can't find any relevant description in the specification. Please help me take a look. Thank you.

  • 0
    TI__Prodigy 700 points

    Cell balancing does not directly disable the DSG/CHG FETs, thus if they are on when cell balancing occurs they will remain on.

    However, if cell balancing triggers some fault (such as an over temperature fault) then this fault could disable the CHG/DSG FETs if they are appropriately configured in fully autonomous mode with the corresponding fault protections enabled for each FET.

  • 0 in reply to Gavin Long
    Intellectual 390 points

    Hi Gavin,

    Thank you for your reply. Please also help me with the following questions，Thanks.

    1. Do the DSG and CSG MOS transistors have other functions besides current protection?
    2. Can the DSG and CSG MOS transistors be removed, and can the customer use an external Pack+Pack- for power protection?
    3. Does the BQ76907's VSS terminal need to be connected to the negative terminal of the battery?
    4. What are the functions of capacitors C20 and C21, and are there any requirements for their selection?