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THVD8010: Use and limitations

Joseph Fariz
Prodigy 10 points

Part Number: THVD8010
Other Parts Discussed in Thread: THVD8000

Can this, or another TI part be used for lighting control over 100-240VAC lines. Total line length can be 10500' with lights at every 200'. How many individual serial numbered units can operate on a single circuit?  Data rate is not critical, but 32 to 64 bits of data transmission is required.

  • 0
    TI__Mastermind 25762 points

    Hi Joseph, 

    Thanks for reaching out on E2E.

    Yes, this THVD80x0 series of transceivers can work over >100V AC lines if designed correctly. 

    First, you can reference our FAQ page with several resources for this device (bottom section):

     [FAQ] RS-485 / RS-422 Transceiver Resources 

    But specifically, this app note seems similar to what you are describing: https://www.ti.com/lit/an/slla590/slla590.pdf 

    However, the main issue I see with your application is that ~10,000ft is very long. Even without a powerline application, RS-485 (which the THVD8000 is loosely based on) has a max data rate of ~4000ft. You will likely need to design repeaters in your system to help re-drive the signal at the weak points. Because there are so many variables for these systems (data rate, cable spec, node count, cap/inductor value, node spacing, stub lengths, etc), it is nearly impossible to suggest the max number of nodes for a system. You will have to investigate this yourself.

    Best,

    Ethan