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THVD1500: RS422 interface device usage

Hiroyasu Koike
Prodigy 60 points

Part Number: THVD1500

Do you think the following drawings is acceptable design for rs422 device usage?

THVD1500.png

  • 0
    TI__Guru 54042 points

    Hi Hiroyasu,

    So in general your unterminated stubs should never be longer than your main bus - that is a general rule of thumb for any wired communication interface. 

    That being said - you don't even need a termination because the bus length is so short - the longest pathway the signal may take is like 1.2m - which for the THVD1500 isn't even long enough to see reflections due to signal transitions. 

    So in conclusion:

    1. Main trunk shouldn't be longer than unterminated stubs

    2. However - since your bus is so short - you don't even need the termination at all because reflections are not a concern with the size of your bus. 

    So remove the termination (or don't - but it isn't really doing anything) and you would probably be good to go - the termination isn't going to help signal integrity with how short your bus is - it just is burning power. 

    Best,

    Parker Dodson