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BQ76940EVM: Reduced Cell Count BQ76940

Magyar Andras Tamas
Intellectual 400 points
Part Number: BQ76940EVM
Other Parts Discussed in Thread: BQ76940, BQ76930

Hi experts,

I understand the requirements for reduced cell count usage with BQ76940 IC. My question is is that apart from shortening the cells, is it mandatory to desolder the parts where there are no cells present? Because later on i want to use the full cell count and I have to resolder it again. 

My other question is that, the reduction is set by the table 26 in the datasheet. Further reduction is not possible ? For example in the case of 15 cell IC the reduction is maximum to 9 cells. It this number can be further reduced or this is the maximum reduction?

Thanks,

Andras

  • 0
    TI__Guru* 81035 points

    Hi Andras,

    For evaluation, it is okay to just short the cells at the terminal block. If you are doing transient tests (like short circuit detection), this is where you may want to desolder the parts because these provide additional signal paths that may impact these tests. 

    The BQ76940 supports 15 cells in groups of 5 cells. Each of the cell groups supports a minimum of 3 cells, so the BQ76940 needs a minimum of 9 cells connected. The BQ76930 can support a smaller number of cells and shares a common layout footprint with the BQ76940 (see Cell Count section of this app note for more details: http://www.ti.com/lit/an/slua749a/slua749a.pdf) 

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Intellectual 400 points

    Hi Matt,

    Thank you for these excellent answers, you helped me a lot.

    And also the doc, I have just opened it, it looks very very helpful.

    Thanks again Sir!

    Regards,

    Andras