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ISO1640-Q1: Can I use ISO1640-Q1 for automotive UART communication?

Oliver Kim7
Intellectual 2680 points
Part Number: ISO1640-Q1
Other Parts Discussed in Thread: ISO7721-Q1, ISO6721-Q1, , ISO6721, ISO7721, ISO1640

Hello team,

My customer is looking for UART isolator.

I cannot recommend digital isolator such as ISO6721-Q1, ISO7721-Q1 because customer wants bi-directional isolator.

I see TI has I2C isolated interface named ISO1640-Q1.

Can I use this for UART communication?

Based on my understanding, the only difference between UART and I2C is necessity of clock synchronization or not.

https://www.totalphase.com/blog/2020/12/differences-between-uart-i2c/

Thanks for you help.

Regards,

Oliver Kim

  • 0
    TI__Genius 17100 points

    Hi Oliver,

    Thank you for posting to E2E! Although ISO164x devices could be used to isolate CMOS signals, data flows bidirectionally in UART from TX of one device to RX of another. I suspect ISO6721 or ISO7721 is the right device for our customer to use in a configuration similar to the schematic shown below:



    Please check with our customer that this is the solution they'd like to replicate, and let us know if there are any further questions.


    Thank you,
    Manuel Chavez

  • 0 in reply to Manuel Chavez
    TI__Intellectual 2680 points

    Hello Manuel,

    I don't understand what you mean.

    The reason why I recommend ISO1640-Q1 is it supports bi-directional communication in "1-wire", not separate RX and TX.

    1-wire should be both input and output.

    Please refer to the example. (https://www.maximintegrated.com/en/design/technical-documents/tutorials/2/214.html)

    Customer cannot use ISO6721-Q1, ISO7721-Q1 because there is only one wire which is used for both TX and RX.

    I believe ISO1640-Q1 is the only one option that we can suggest in 1-wire bi-direction application. Is it correct?

    Thanks.

    Regards,

    Oliver Kim

  • +1 in reply to Oliver Kim7
    TI__Genius 17100 points

    Hi Oliver,

    Thank you for clarifying the 1-wire UART requirement. ISO1640 is our best option here since it isolates bidirectional communication. If our customer's system supports open-collector inputs and outputs, has data rates below 1.7MHz (both look typical in the example you provided), and is compatible with ISO1640's VIH/L and VOH/L thresholds shown below, it should be fine to use with "1-wire" communication:




    Respectfully,
    Manuel Chavez