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Original question:

ISO1541: To know the maximum distance of the I2C cable that it supports between ISO1541 and slave device

ISO1541: Regarding EMI/EMC consideration while extending I2C cable between master and slave

Subha Angusamy
Prodigy 40 points
Part Number: ISO1541

Dear Sir,

      Thank you for your support, we have another request

1. While increasing the I2C cable length between ISO1541 and NFC board can you suggest consideration on EMI/EMC

2. I would like to have information on the EMC and noise consideration and the effects of increasing the I2C cable.

 

Thanks & Regards,

A.Subha

  • 0
    TI__Mastermind 49415 points
    Hi Subha,

    Before I help you with my inputs, may I know what are the EMI tests that you are planning to run on ISO1541 or on your product that uses ISO1541? Sharing the list of EMI standards that you are trying to qualify your product for will also help us understand your EMI requirements.


    Regards,
    Koteshwar Rao
  • 0 in reply to Koteshwar Rao
    TI__Mastermind 49415 points
    Hi Subha,

    Please do share the above requested data to be able to help you further. Thanks.


    Regards,
    Koteshwar Rao
  • 0 in reply to Koteshwar Rao
    TI__Mastermind 49415 points
    Hi Subha,

    I am assuming you have found the answers through other means and do not have any further questions on this. I will go ahead and mark this post as resolved, if you have any further questions or need clarifications you can reply to this post or create a new one. Thanks


    Regards,
    Koteshwar Rao
  • 0 in reply to Koteshwar Rao
    Prodigy 40 points
    Dear Sir,
    Sorry for the late reply, as of now we have considered only the basic and general EMC tests for NFC as follows,
    1. FCC Test
    2. Normal Temperature rise Test
    3. Dielectric strength test after normal temperature rise
    Based on these tests can you suggest me the EMI EMC considerations for I2C isolator IC (ISO1541).


    Thanks & Regards,
    A.Subha
  • 0 in reply to Subha Angusamy
    TI__Mastermind 49415 points
    Dear Subha,

    Thanks for your inputs. With a 2m cable, we do not expect to see any EMC issues from ISO1541. If you see slower rise / fall times due to bus capacitance (should be <400pF) then you can decrease the pull-up resistor values to support higher output current drive and faster rise times. Please make sure you do not exceed device max sink current (35mA for Side2).

    To make sure your PCB is following the general guidelines for optimum performance, please do follow the guidelines provided in ISO1541 datasheet under Section 10 (Power Supply Recommendations) and Section 11 (Layout). Thanks.


    Regards,
    Koteshwar Rao