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BQ76930EVM: BQ76930 EVM

Julin Thomas
Prodigy 20 points
Part Number: BQ76930EVM
Other Parts Discussed in Thread: EV2400, BQ76930, BQ78350

Tool/software:

I am trying to establish SMBUS communication between STM8 and BQ76930EVM. I am configuring STM8 as a Master. 

Right now I am using EV2400 to read the register values via I2C.

and I see BQ76930 and BQ78350 used on the same EVM board. How do I know to which microcontroller I am communicating to?  and how will the connection look like? 

  • 0
    TI__Expert 5645 points

    Hi Julie, 

    The BQ78350 is a companion gauge for the BQ7690 monitor, you can refer to the companion gauge datasheet for details on how to connect these both ICs together (https://www.ti.com/lit/ds/symlink/bq78350-r1a.pdf).

    On the simplified case, you can communicate from your MCU directly to the companion gauge BQ78350, and this will communicate with the battery monitor BQ76930 via I2C. You can also bypass the companion gauge and communicate directly with the battery monitor  (D/S https://www.ti.com/lit/ds/symlink/bq76930.pdf). If you want to communicate directly with the battery monitor you can disconnect the I2C connection between your companion gauge and connect your MCU directly on the I2C bus of the BQ76930. 

    The EV2400 can be used to control both devices, same as your STM8. Most likely the EV2400 is talking to the BQ78350 and the BQ78350 is talking to the BQ76930 on your board. Refer to the schematic and user guides to connect the ST MCU as needed. 

    Regards, 
    Arelis G. Guerrero