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BQ76930: 7 Cell configuration, wrong connections

Joerg Schneide
Prodigy 40 points
Part Number: BQ76930
Other Parts Discussed in Thread: BQSTUDIO,

Hello,

we have a few PCBs with the short connections for a 7-Cell configuration done wrong. Instead of connecting VC8 & 9 to VC7, they are conncted to VC10.

In bqStudio with a AFE Cell Map setting of 0x00f7 evreything seems ok, on a first look.

But what about balancing? There are external N-Fets for balancing.

Is it neccessary to correct the pin-configuration, or is it possible to leave it as it is? If possible, are there any drawbacks?

  • 0
    TI__Guru 54715 points
    Hi Joerge,
    The AFE cell map will take care of the voltage and balancing assignment, however you should fix the connection. The bq76930 upper cell is designed for a common mode voltage since the BAT pin voltage may not always be as high as VC10. When the top cell is shorted and the supply voltage varies the shorted cell may no longer read as 0. This will add into the Battery voltage, but perhaps a greater concern is that if the cell 10 voltage comes up above the undervoltage qualification threshold the unused or shorted can cause an undervoltage. Using the part as indicated in the data sheet is recommended.