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BQ79600-Q1: BQ79600-Q1 daisy chain BQ7961x

yves gagniere
Intellectual 1575 points
Part Number: BQ79600-Q1
Other Parts Discussed in Thread: BQ79616

Hi

What is the maximum number of BQ79612//4/6 a BQ79600 can drive? Is there a recommended number below the max to avoid latency,..?

Thanks

  • 0
    TI__Genius 17370 points

    Hi Yves,

    Technically the limit is determined by the device address register (up to 63 stacked) but we typically see a common 400V pack which would be ~96S cells in series which could be covered by 6 bq79616 stacked devices for example. This would help reduce the risk to be able to read back all data in a timely manner to meet strict automotive functional safety timing requirements.

    Regards,

    Taylor

  • 0 in reply to Taylor Vogt
    TI__Intellectual 1575 points

    Hi Taylor,

    what is the advantage of using a BQ79600 instead of UART from the CPU to daisy chain BQ7961x?

    Thanks

    Yves

  • 0 in reply to yves gagniere
    TI__Genius 17370 points

    Hi Yves,

    Typically in HV systems, there is a best practice to have a bridge comms device sitting on the same board as the MCU to be isolated from HV pack side. So you can use 600 rather than using another cell monitor device that doesn't have any cells to monitor. Plus 600 offers SPI and a few other helpful features for communications outlined in the datasheet. However, you are correct it is possible to use a 616 device as the UART bridge as well. 

    Regards,
    Taylor