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Versatile Cell Battery Monitor Design

Alexander LePelch
Prodigy 20 points
Other Parts Discussed in Thread: BQ76930

Hello,

I am inquiring about the possibility of designing a versatile battery monitor system using the bq76xx integrated circuits. 

Ideally, the design would allow for multiple different battery types, namely, the number of cells in series, i.e. 3s vs 12s or anything in-between. 

Is there a way I can design the system to work with these different battery architectures? For example, have one user connect their 3s battery to the designed circuit board, which will handle protection for overcurrent etc., and have a separate user connect their 6s battery to accomplish the same thing?

Regards,

Alex

  • 0
    TI__Expert 4640 points
    Hi Alex,

    The capability of the bq769xx chipsets, limit the possibility that you are trying to accomplish as you need to have enough cells power the chipset. The devices have their limit as to how many they need to have to power up completely. For example you can't use a bq76930 to use anything from 1S up to 10S battery packs. Also you FW running on the MCU would need to know how many cells are then being connected and which how it should manage them etc. There are varying issues with this type of approach. Is there a particular reason as to why you want to design it this way? What are you trying to accomplish? Perhaps you can allow us to give you a different solution.

    Thanks

    Miguel
  • 0
    TI__Expert 6085 points

    Alex,

    Also keep in mind the following at the system level

    (1) there needs to be a min of 3 cells per group when using the  bq769x0.  refer to pp 42 of the d/s

    (2)  depending on the voltage of the mcu needed and how it is to be powered ( many use the TI gauge which is powered @ 2.5V), users need to decide which version

          of the device ( 3.3V and 2.5V LDO )  is needed. refer to page  pp 4 section #4.