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Failure Mode Analysis for ISO7342FC

NY
Expert 3040 points
Other Parts Discussed in Thread: ISO7342FC

Hi

My customer is considering to use the ISO7342FC for noise isolation. To start the design on the production level, they are now performing FMA on this device.

In this analysis, customer asked us their concern as attached.

The Output side (Vcc2/GND2) is connected via Flexibile Cable, so what's oputput signal if the connection is not good?

Would you teach me what expected to be happend.

Question ISO7342FC.pdf

  • 0
    TI__Mastermind 49445 points
    Hello Yada-san,

    Digital Isolators do not any specific termination in general, the output signal should reflect input signal applied irrespective of the output connection being good or not. If input is not applied and left open, output would be LOW for ISO7342FC. As long as there is electrical connection signal should get transmitted through the connectors, if there is no electrical connection there won't be any signal transmission.
    When the input channels of ISO7342FC on Side 2 are left open, the output on Side 1 would be LOW.
    Could you please let me know what is the length of FFC cable?

    Regards,
    Koteshwar Rao
  • 0 in reply to Koteshwar Rao
    TI__Expert 3040 points

    Hi Rao,

    Thank you very much for your comment.

    I understand the mechanize when the input channels are left open on both side, Side1/2.

    What the customer wants to know is when the output channels are left open on each side, while power of the inputs are certainly  applied.

    Best Regards,

    Naoki Yada

  • 0 in reply to NY
    TI__Mastermind 49445 points
    Hello Naoki,

    Let me rephrase to see if I understand your question correctly. When output channels are left open (Side 1 or Side 2) and input side is powered, you want to know what happens to output state?
    I am assuming there is power applied to output side, if so then output should not be affected. If power to output side is not applied, output state cannot be defined since there is no power applied to the circuitry. Does that answer your question?

    Regards,
    Koteshwar Rao
  • 0 in reply to Koteshwar Rao
    TI__Expert 3040 points

    Hi Rao, 

    Thank you very much for your replying.

    Your comments are helpful for us to answer the customer.

    Best Regards,

    Naoki  Yada