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BQ76920: Companion Controller Need

user4931135
Prodigy 40 points
Part Number: BQ76920
Other Parts Discussed in Thread: BQ78350-R1, BQ78350

Hi,

I am planning to use BQ76920 for a 3-series cell application and I don't need any monitoring or register feature. I choose it because of cell balancing feature. Do I still need to use companion controller? 

Best regards,

  • 0
    TI__Expert 6085 points
    yes, a controller is needed to setup the balance registers( CELLBAL1, CELLBAL2) inside of the AFE(bq769x0) family. The controller can write to the AFE registers via the i2C. The EVMs have bq78350-R1(gauge) and the balancing algo is given in the bq78350 data manual.
    hope this helps out.
  • 0 in reply to Vish Nadarajah
    Prodigy 40 points

    Vish Nadarajah said:
    yes, a controller is needed to setup the balance registers( CELLBAL1, CELLBAL2) inside of the AFE(bq769x0) family. The controller can write to the AFE registers via the i2C. The EVMs have bq78350-R1(gauge) and the balancing algo is given in the bq78350 data manual.
    hope this helps out.

    You are saying that without bq78350-R1, I can't use balancing feature. Is it contain both internal and external balancing? Because I use it just for 3-series cells application and I don't think I use external balancing.

  • 0 in reply to user4931135
    TI__Expert 4640 points
    Hi,

    Let me clarify. You need an MCU OR bq78350 not both, but you need one or the other. The bq769x0 Monitors do not work by themselves.

    Thanks

    M