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russ
russ
Associate III
June 12, 2008
Question

CAN and USB sharing the same lines

  • June 12, 2008
  • 2 replies
  • 563 views
Posted on June 12, 2008 at 23:20

CAN and USB sharing the same lines

    This topic has been closed for replies.

    2 replies

    russ
    russAuthor
    Associate III
    May 17, 2011
    Posted on May 17, 2011 at 12:37

    Is it possible to have CAN and USB share the same lines to allow switching between both protocols? (They go to the same pins on the chip) I know USB requires transient voltage supression circuitry (like the USB6B1:

    http://www.mouser.com/Search/ProductDetail.aspx?qs=f9uBznyCLhZlkTGf%252b8M7Kg%3d%3d

    )

    Will this interfere with CAN? I wouldn't think so. I also have seen that CAN communication requires its own seperate transceiver. Is this an absolute necessity?

    What I am trying to do is allow USB programming via bootloader, then CAN communication to external devices on the same outputs (over a USB cable).

    Any advice/input is much appreciated.

    jj_it
    jj_it
    Associate II
    May 17, 2011
    Posted on May 17, 2011 at 12:37

    Suspect someone here knows - will advise.

    In absence of ''tried/proven'' how about using ''2-wide'' data mux -

    steering STM32 pins to either USB or CAN bus components?

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