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ISO1450: [ISO1450, ISO1500] Inquiry about communication verification method

MJ Jeon
Genius 5240 points
Part Number: ISO1450
Other Parts Discussed in Thread: ISO1500,

Hi, TI Support Team

A customer is developing using ISO1450, ISO1500 products.

The block below is an example block of ISO1450, and the two parts are applied to different boards, so a separate connection is required.

Is it possible to verify the communication waveform of each part when not connected?

If it is impossible, if you think that the two parts of the block are each Tx/Rx, please tell me how to verify the communication waveform when one of them is missing.

I think the communication verification will be done in the same way for the two parts mentioned at the beginning, but if there are any differences, please let me know.

Thanks.

Regards,

MJ

  • 0
    TI__Intellectual 1960 points

    Hi MJ:

    Thanks for posting your question on E2E!

    It's possible to detect the far-end connection leveraging the failsafe feature (refer to section 10.3.2 of the ISO1450 datasheet).

    ISO1450 and ISO1500 devices have this failsafe feature where the receiver outputs a logic HIGH signal when the RS-485 bus is idle; i.e. when the far end transmitter is not transmitting. You may implement a timer in the RS-485 controller / MCU that whenever the receiver output stays high for longer than a timeout period, the controller / MCU declares this as far end transmitter not connected. This timeout duration should be chosen in such a way that it doesn't get triggered during normal operation; i.e. timeout duration is longer than the longest normal operation bit period.

    The failsafe receiver feature is present in ISO1450, ISO1500 and SN65HVD184.

    Regards,

    Dushmantha