ISO1540: please suggest the ISO1540 I2C level fail

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Replies: 4

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Part Number: ISO1540

Sir,.

do you suggest the ISO1540 I2C level fail please, thanks

4 Replies

  • In reply to PHILIP HSU:

    Hi Philip,

    I am not sure if I understand your question correctly. Are you asking why there is about 0.8V on the yellow waveform when the blue one is 0V? If this is your question then please read below the FAQ E2E post. This is expected and normal, it doesn't cause any issue in communication providing the I2C isolator is interfaced to the compatible I/Os on MCU or ADC. Please do go through the post and let us know if you have any questions, thank you.

    Regards,
    Koteshwar Rao

  • In reply to Koteshwar Rao:

    Hi Rao,.

    Actually, it was failed in I2C communication as waveform as shown,.

    do you suspect the placement issue of the GND via between isolator ?

  • In reply to PHILIP HSU:

    Hi Philip,

    I do not think the GND via is causing any issue here. If customer is seeing a communication issue, it could be due to mismatch in I/O logic levels between ISO1540 Side1 & MCU.

    Could you please share MCU I2C pins VIL, VIH & VOL levels? Alternatively you could also share the MCU part number and mention which pins are configured as I2C and interfaced to ISO1540 Side1. Thanks.

    Regards,
    Koteshwar Rao