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BQ76PL455A-Q1: Communication via COMML from MCU

Mathieu Chouinard
Prodigy 20 points
Part Number: BQ76PL455A-Q1
Other Parts Discussed in Thread: BQ76PL455A

Hi,

In our current design, we have several boards connected to each other via daisy-chain and with the idea of modularity, we can take any of the boards and place it in any other position. We can take any acting as a slave and put in place of the master and the whole daisy-chain will work.

Going with the BQ76PL455A now, I see that communication between the MCU and the first BQ in the daisy-chain is done via the TX an RX pins, using UART. To keep the idea of modularity, my question is this: Is it possible to communicate from the MCU, a TMS570 for example, to the master BQ76PL455A via the COMML- and COMML+ pins instead ? What would this entail ?

Thank you,

Mathieu

  • 0
    TI__Genius 10785 points

    Hi Mathieu,

    Sorry but answer is NO.

    MCU has to talk to the TX RX.

    I think I understand what you are trying to do.

    One option is use another PL455A as your bridge IC then you can mover around your stack boards.

    Roger

  • 0 in reply to Roger Hwang
    Prodigy 20 points

    I would have a couple questions then.

    Would tying the COMML and TX RX pins together have any adverse effects on the BQ ? I'm guessing so, but if not, that would solve quite the problem.

    And just to futher comprehend the BQ COMM communcation, there is no way to convert the UART protocol into the differential protocol the BQ uses ?

    Having to add a BQ on the MCU board would not be feasible unfortunately. I am open to other ideas that could solve this problem. The goal is to have a plug-and-play system where we can choose any BQ board and put it in any position for any battery segment and they will work.

    Thank you.

  • 0 in reply to Mathieu Chouinard
    TI__Genius 10785 points

    Hi Mathieu,,

    Unfortunately, this is not possible.

    You have to have bridge IC for you it work as you want.

    Base device must be Uart unless you have bridge IC that you can't have.

    Roger