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ISO1042: Isolation without transceiver?

D3j4nHr01
Intellectual 420 points

Part Number: ISO1042
Other Parts Discussed in Thread: ISO7760,

Tool/software:

Hello,

I would like to isolate CAN bus on my device. These products have usually already isolator + transceiver in the same package. I have transceiver already integrated in my device Is there any isolator that can make isolation on CANH/CANL signals directly or any other solution that brings the same effect?

Many thanks,
Kind regards,
Dejan. 

  • 0
    TI__Mastermind 34580 points

    Hi Dejan, 

    I would call what you are looking for an isolated CAN repeater. Unfortunately, we do not have an isolation solution at this time. What is this device with integrated CAN? 

  • 0 in reply to Andrew J
    TI__Mastermind 34580 points

    Hello Dejan,

    Please let me know if you have any feedback on the integrated CAN device that is used. I will go ahead and close this post.  

  • 0 in reply to Andrew J
    Intellectual 420 points

    Hello Andrew,

    I'm really sorry for late answer, but I didn't get any notice that somebody replied to my post. Honestly, I was manually checking now and saw that you replied.

    I'm thinking about isolation as a way to minimise ground loops and/or reduce EMI signature. I completly understand that CAN interface doesn't really need ground between devices. But this is true if common-mode voltage is lower than maximum allowed. However, to be sure it is better to connect ground in between, but in that case ground loop can be created. That is why I'm thinking about CAN isolator. 

    I'm talking about Raspberry Pi CAN shield. It has MCP2515 transceiver on it.

    Many thanks.

  • +1 in reply to D3j4nHr01
    TI__Mastermind 34580 points

    Hello Dejan,

    No worries on the reply time. Posts reopen when you reply. If you have listed an email on your account, E2E should send an email when someone posts in your thread. 

    Thank you for sharing the transceiver used. I understand that you are using a raspberry pi CAN shield which explains your need to isolate the CAN lines. Unfortunately we do not have a solution to do this for CAN as I said earlier. 

    The best solutions for isolation would be to use one of the following in the final solution  

    1. A digital isolator such as ISO7760 to isolate the logic signals of MCP2515 and provide isolation. 
    2. Isolate the CAN bus at each peripheral node using a device like ISO1042

    I hope this helps. And let me know if you have any questions. 

    Best,
    Andrew