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BQ76920: Using two IC for my BMS (I2C)

Maxime Brischoux
Prodigy 10 points
Part Number: BQ76920

Hello, 

I have to design a BMS to monitor my battery cells. I will use from 3s3p to 5s3p packs and I have few question :

I will use 3 of these ICs, one for each string, how can I communicate with these three IC ? Should I use 3 separate bus or can I use the same ? If not, can I just use a demux to discuss with the good one ?

Thanks by advance,

Best regards,

Maxime

  • +1
    TI__Guru* 77343 points

    Hi Maxime,

    I am not 100% clear on what you are trying to do. Typically for a 5s3p pack, most users will use one battery monitor. If the strings need to be monitored separately, then multiple monitors are needed. You will need 3 separate busses since the I2C address will be the same for the same part number. 

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Prodigy 10 points

    Thank you for this quick answer, 

    I was wrong on the denomination, I will use 3 strings of 5 batteries in Serie, like this : (so 3p5s I guess)

    |-[]-[]-[]-[]-[]-|

    |-[]-[]-[]-[]-[]-|

    |-[]-[]-[]-[]-[]-|

    In any case you perfectly answered my questions, thanks a lot for your quickness!

    Best regards !