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BQ76925: standalone balance charging

Simon Seghers
Prodigy 10 points
Part Number: BQ76925
Other Parts Discussed in Thread: BQ24616, BQ77915

Hello,

I have a questions regarding the standalone functionality of the BQ76925 when no I2C interface is used.

The goal is to have a removable battery pack for a device with the BQ76925 balancing/monitoring IC inside. The battery pack is removable and will be connected to a standalone battery pack charger (for example the BQ24616). Ones the battery pack is placed inside the device the I2C interface is connected to an onboard MCU. Based on the Register Maps on datasheet page 22 and following I assume it is likely not possible, but not sure.

My question now is, if it is possible to balance charge the pack inside the charger with default power on values or values set in the EEPROM memory of the BQ76925? 

  • 0
    TI__Mastermind 42060 points

    Hello Simon,

    The BQ76925 requires an MCU with I2C interface in order to provide cell balancing. This is not done autonomously by the AFE, hence it cannot be used standalone for this purpose. The MCU will tell the BQ76925 when to balance any cell.

    If you are looking for a protector that can do cell balancing, the BQ77915 is able to provide autonomous cell balancing and protection features. Although it provides no cell voltage monitoring.

    Best Regards,

    Luis Hernandez Salomon