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ISO1410: isolator location

justifice zhou
Intellectual 400 points
Part Number: ISO1410

Hi,

in the ISO1410 datasheet page 26, we have the block diagram and it shows that the digital isolator is at DE, D, R side.

My question is: why can't we locate the isolator at A,B side? Then we will need only 2-channel digital isolator instead of 3-channel.

  • +1
    TI__Guru 55655 points

    Hi,

    Thanks for reaching out.

    The general purpose digital I/Os of most digital devices use CMOS or TTL logic signals and hence, there are digital isolators for isolating those logic I/Os. While A and B signals are RS-485 defined electrical signal that are higher in voltage and are bidirectional. It is very economical to isolate the logic signals than directly trying to isolate a higher voltage high specification interface. For that reason, we implementation isolation on logic I/Os. Thanks.


    Regards,
    Koteshwar Rao