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BQ76PL536A-Q1: daisy chain communication in different PCBs

Samruddhi Patil
Prodigy 210 points
Part Number: BQ76PL536A-Q1

As you have given a reference design for the part number BQ76PL536A-Q1 in TIDA-00821, it contains 3 BQ76PL536A-Q1 on the same PCB. Hence there is no need to isolate the SPI daisy chain between them. I want to design a circuit wherein I would like to use single BQ76PL536A-Q1 on a PCB and next BQ76PL536A-Q1 on another PCB. I don't know the distance between 2 PCBs. Do I need to have 2 SPI isolators for each north and south connections in order to ensure the uninterrupted or fault proof communication between 2 PCBs?

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    TI__Genius 17370 points
    Hi Samruddhi,

    Welcome to the E2E forums and thanks for the question! If you want to have multiple devices on separate pcbs you will likely introduce noise coupling onto the cabling and potential communication issues so it will be beneficial to add isolation and filtering on both sides of the pcb and minimize the distance between pcbs as much as possible. Also if you are doing a new layout, grounding planes and sufficient current paths will be critical for robustness.

    Hope this helps,

    Taylor