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ISOW1044: ISOW1044 & ISOW1044DFMEVM

Tom SP
Prodigy 60 points
Part Number: ISOW1044
Other Parts Discussed in Thread: , TIDA-010938

Tool/software:

Hi,
On the ISOW1044 datasheet (page 36), there's a PCB layout example illustrating the recommended placement and routing of external components. We've noticed that the ISOW1044DFMEVM design was created in Altium, but we couldn't find the Altium design files on the official TI website.
To streamline our product development, minimize errors from manually replicating the design, and avoid unnecessary rework, would it be possible to obtain the original design files?
Our account is registered with a company email. We appreciate your assistance.
We've also observed a difference in the connection of the common-mode filters/chokes (L11) in the ISOW1044DFMEVM and the reference design TIDA-010938.
In ISOW1044DFMEVM, L11 is first connected to ISOW1044DFM:19 (CANH) & ISOW1044DFM:18 (CANL), followed by the RC filter.
In TIDA-010938, ISOW1044DFM:19 (CANH) & ISOW1044DFM:18 (CANL) are first connected to the RC filter, then to L25.
Which configuration is correct and recommended?
Looking forward to your guidance.
Best regards,
Tom
  • 0
    TI__Genius 9610 points

    Hi Tom

    Thank you for reaching out.

    On sharing the original design files, apologies to disappoint but we can not share original Altium design files. Even for our reference designs, PCB design files are not provided publicly.

    Now, coming to the Common-Mode Choke(CMC) Position:

    1. First, The RC filter which you're referring to is actually the termination on the CAN Bus. In this particular case, it is in split termination mode which makes a low pass filter for the high frequency noise component that CAN device can emit on the the Bus.
    2. Placing CMC before termination is always the best and recommended practice as it blocks the noise before it reaches the termination and might be visible to other device nodes on the bus.
    3. But, if there are no devices between Termination and CMC, like in TIDA-010938, CMC still serves the same purpose of suppressing CM noise on the bus with same effectiveness
    Regards
    Varun
  • 0 in reply to Varun Kumar
    Prodigy 60 points

    Hi Varun,

    Thank you for your response. However, I believe there may be some misunderstanding. My expectation was not for you to share the files publicly on the forum, but rather to send them privately via email, as has been done in previous instances.

    Here is an example of a similar past request where the files were provided, so it seems there may have been some mix-up:

    e2e.ti.com/.../isow1412-altium-example-design

    By the way, thank you for the clarification for CMC. Everything is clear there.

    Best regards,
    Tom

  • 0 in reply to Tom SP
    TI__Genius 9610 points

    Hi Tom,

    Understood and apologies for the confusion.

    Please check your registered email, the files have been sent.

    Regards
    Varun