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Bq77910A stacking with bq34z100 for fuel gauging

Mohit Chopra
Intellectual 830 points
Other Parts Discussed in Thread: BQ77910A, BQ34Z100, BQ29200

Hi,

I have worked on bq77910A upto 10 cells. Now I have to work on a battery System 48V/100A battery pack. Kindly provide a design which having two bq77910A  stackable & bq34z100 for fuel gauging.

Regards,

Mohit

  • 0
    TI__Guru 54715 points

    I do not know of a reference schematic for this type circuit.

    There is the design in www.ti.com/lit/slua637 for stacking if it is suitable.  If you are using gauging you will want good care on balancing.  Customers have considered overlapping a cell so that all cells are balanced together rather than as 2 separate groups.  The bq29200 may also be used to balance between the 2 device's cells.  A cell monitored by more than one part may be the one to discharge fastest. 

    The gauge would be set up in its normal manner.  For communication with the gauge in system, you will need some level shifter on the communication lines or high side switching as shown in the bq34Z100 datasheet block diagram.  The high side switch may make some other level shift and AND circuit for the FET control preferred.