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ISO1410: Communication failed during test

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Replies: 9

Views: 92

Part Number: ISO1410

Hi, expert,

My customer encounters an issue when measure ISO1410 output data, they found the R pin will be pulled down for a short time when use the probe to measure it. Could you please help analysis this issue? Thanks.

Best Regards.

Chen

  • Hi Chen,

    Thanks for reaching out.
    Could you please provide a higher resolution image of the waveform you have shared?
    Can you please also request customer to monitor both input (either A-B or A & B separately) and output (R) in one waveform to better compare and share the same with us?

    Regards,
    Koteshwar Rao

  • In reply to Koteshwar Rao:

    Hi, Koteshwar

    The clear waveform is as following,

    CH1: A

    CH2: B

    CH3: R

    Best Regards.

    Chen

  • In reply to CHEN YAN:

    Chen,

    Thank you for providing the waveforms as requested!


    The provided waveform shows that the output (R) is in the mid-rail, which implies that the output (R) is disabled and in a high impedance state.

    Could you please ask the customer to observe the RE bar/DE signal?

    Please request the customer to capture the RE bar/DE, A, B, and output (R) in one waveform and share them with us.

    Regards,

    Alfred Chong

  • In reply to Alfred Chong:

    Chen,

    I hope you have resolved your customer's issue by observing the RE bar/DE signal.

    Please feel free to reach out to us if you have other questions.

    Regards,

    Alfred Chong

  • In reply to Alfred Chong:

    Hi, Alfred,

    Sorry for the delay, could you please help analysis below waveforms? Thanks.

    CH1 : EN

    CH2: R

    CH3: A

    CH4: B

    Best Regards.

    Chen

  • In reply to CHEN YAN:

    Hi Chen,

    Thank you for sharing the waveforms.

    We can clearly see that the output(R) becomes high impedance when the ENABLE signal

    went from low to high. This is because the output(R) only turns on when the ENABLE signal

    is a logic low.

    Regards,

    Alfred Chong

  • In reply to CHEN YAN:

    Hi Chen,

    Thank you for sharing the waveforms.

    We can clearly see that the output(R) becomes high impedance when the ENABLE signal

    went from low to high. This is because the output(R) only turns on when the ENABLE signal

    is a logic low.

    Regards,

    Alfred Chong

  • In reply to Alfred Chong:

    Hi, Alfred,

    I'm sorry that you may misunderstand customer's question, the question is when they use probe to measure R, R pin would drop to GND for a while, please see the zoomed waveforms.

    Best Regards.

    Chen

  • In reply to CHEN YAN:

    Hi, Alfred,

    Actually we can see from the test results, every signal goes OK, but they found the software can't read R signal when the probe add to the R pin, should they use special probe to measure R signal or should the add some external circuit to test R signal? 

    Best Regards.

    Chen