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BQ76930: BQ76930 cell voltage incorrect

Star Xu
Genius 9645 points
Part Number: BQ76930
Other Parts Discussed in Thread: BQ78350, BQSTUDIO

Hi 

The customer design with BQ76930+BQ78350 for 8 series cells. The actual voltage of each battery is about 4150mV, but the value displayed on bqStudio is about 4500mV.

Attached the schematic as below:

BATBoard.pdf

Please help check it.

Thanks

Star

  • 0
    TI__Mastermind 27321 points

    Hello Star,

    Please see my comments below:

    1- We noticed Schottky diodes are being used, which can cause error measurements. Can you change to conventional diodes and see if it fixes the issue? These should be conventional diodes. For more information reference to this E2E.

    2- For a 8-series connection, we recommend to short VC9-VC8 and VC4-Vc3 cells

    3- Filter components must be present at the supply pins. Please see attached video.


    Note: Please ignore cell connections from VC10b and above as the BQ76930 only supports up to 10S.

    Regards,
    Jose Couso