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bq76930 cell connections for 8 cells in series - VC5B reference

Claude Correia
Prodigy 20 points
Other Parts Discussed in Thread: BQ76930

I'm a new user for the bq76930 and have a few questions for the cell connections to the AFE. I am connecting 8 cells in series for ~32V battery. I've connected Cell 8+ to VC10, Cell 7+ to VC9 & VC8, Cell 6+ to VC7, Cell 5+ to VC6, Cell 4+ to VC5, Cell 3+ to VC4 & VC3, Cell 2+ to VC2, and Cell 1+ to VC1. Do I have the short connections correct for the inputs?

My other question is the VC5B connection. Is it the center point of the cell connections of the 8 cells, so it would connect to the filtered VC4 connection? I have a schematic started and I'm including it here.

I just noticed that my connection for D9-A should go to VC4 instead of VC5, if I'm interpreting the connections correctly.

  • 0
    TI__Guru 54715 points

    Hi Claude,

    It seems your post was overlooked and your schematic does not show up today.  From your description it sounds like you have followed the scheme in the datasheet table 8-2 for 8 cells and it should be correct.

    VC5B should reference back to cell 4 in your system but should be filtered separately to the pin.   Cell 4 in your system should have 3 connections going to the bq76930, each with a separate filter:  VC5, VC5X, and VC5B.  Again I don't see the schematic, but the lower protection diode would go from VC5 pin to VC5X pin as shown in figure 8-2 of the datasheet.  There are of course many ways to draw the schematic so yours may look different, it is the connections that are important.