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CAN−bus Extender

samed a
Prodigy 10 points
Other Parts Discussed in Thread: SN74HCS32

Hello,

I want to Canbus extender. I was using AMIS42700. However, at the moment AMIS42700 is unfortunately not produced. I use ICs such as TJA1050 or TJA1448. I ran 4 nodes with the following arbitration circuit. Can I increase the number of nodes up to 10? Is there any other solution you would suggest?
T

Thanks
Best regards

  • +1
    TI__Guru 53555 points

    Hi Samed,

    I've linked an isolated CAN FD repeater reference design below. This may be similar to the design you're working on, so it may be a good reference when all of the isolation components are bypassed. It also includes a TCAN1042 8-pin CAN transceiver in the design which may be swapped for the dual CAN TCAN1046 for your multi-channel solution. 

    What is your concern with increasing the number of nodes? Is there a worry about overloading the bus? If you can share the desired bus topology I may understand your question here a bit better. 

    https://www.ti.com/lit/ug/tidudb5a/tidudb5a.pdf?ts=1641487152299&ref_url=https%253A%252F%252Fwww.google.com%252F 

    Let me know if this reference design looks like what you're going for or if your solution is for something different. 

    Regards,
    Eric Schott

  • 0 in reply to Eric Schott1
    Prodigy 10 points

    Hi eric,

    The circuit I want to make is shown below. There are drivers and sensors in the can bus line. I also reviewed the reference design. But I have limited space for the printed circuit board and there are more components here.

    Thank you for your message.

    Best regards

  • +1 in reply to samed a
    Guru 316690 points

    The arbitration logic circuits in your question and in the reference design are essentially the same. But note that the OR gates are used with slow input edges and must have Schmitt-trigger inputs, i.e., SN74HCS32.

    There is no limit on the number of nodes.