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BQ79600EVM: any limitation to access a large BQ79616 daisy chain ? (with and without the GUI)

Pial
Expert 7280 points
Part Number: BQ79600EVM
Other Parts Discussed in Thread: BQ79616-Q1, BQ79616EVM-021, BQ79616

Dear team,

Is there any limitation in the BQ796xx GUI, which would prevent accessing the full BQ79616-q1 daisy chain ? (looks to be ok https://www.ti.com/lit/pdf/sluuc36, but double checking here)

Also, can you confirm the maximum number of BQ79616-Q1 which could be inserted in the daisy chain ? - looks to be 64 according to this other thread (+) BQ79616-Q1: When daisy-chain communication, up to how many 79616 chips can be connected? - Power management forum - Power management - TI E2E support forums, but 34+bridge = 35 according to BQ79616EVM-021 documentation (maybe 35 is a typo). --> https://www.ti.com/lit/pdf/sluuc37

Many thanks in advance for your support!

Best regards,

PA

  • 0
    TI__Genius 17370 points

    Hi PA.

    What do you mean by preventing access? In the communications tab you can manually disable the TX transmitters in either direction but usually this is for debug purposes or swapping for ring architecture setups. The theoretical addressing limit is 64, but typically 35 should be plenty for most systems (35*16cells) so we typically do our testing up to 35 hence that is our recommended limit for use.

    Regards,

    Taylor

  • 0
    Prodigy 20 points

    Hi Taylor, 

    Thanks for your response. (PA wrote for me because I was not yet registered). 

    Indeed, I want to communicate with 36 BQ79616 (Slave) using a BQ79600 (Master). This because is not an application of battery pack but a battery storage app. 

    Can it pose physical problem (not theorical adressing) to go up to 36 instead of 35 ?
    What is a "bridge", it's the same as a "Master ? 

    Thanks in advance, 
    Regards, 

    Emilie

  • 0 in reply to PORTET Emilie
    TI__Intellectual 1845 points

    Hi Emilie,

    If your application calls for more than 560 series cells, then using 36 '616s instead of 35 should be fine. We use the term "bridge" for the 600 device because it takes UART/SPI commands from the host MCU and converts them to VIF protocol to communicate to stack devices. In the VIF protocols there really is no concept of master and slave devices but if you want to think of it that way I would say the host MCU is the master and the 600 acts as a communication bridge to the '616 slave devices. Hope this helps.

    Thanks,

    Chase

  • 0 in reply to Chase Fagen
    Prodigy 20 points

    Hi Chase, 

    Thank you so much for your reponse, it's so clear. 

    Emilie