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THVD1452: THVD1452

Semyon Ezerski
Prodigy 20 points
Part Number: THVD1452

Tool/software:

We work with THVD1452 in 3.3V environment and standard  RS485 configuration with both bus sides terminated to 120 Ohm and multiply driver/receivers connected. Can we have any bus operation corruption/distortion due to certain number of drivers and/or receivers on bus  will stay without power connected while other operate in normal condition. Mostly it meant clamping to power effect for unpowered devices.This question does not concern the transient glitch, but related to continuous operating mode during certain time intervals

Thanks,

Semyon

  • 0
    Guru 316470 points

    The receiver's II specification shows that the input current does not change when powered off.

  • 0
    TI__Guru 72381 points

    No, our RS485 devices should not back bias and turn on. They should also operate normally after they power up regardless if there is something happening on the RS485 bus while they were unpowered. 

    I would probably just make sure that the devices have the DE disabled when they power up to avoid in contention state on the RS485 side (this shouldn't break the device, I'm just saying this to watchout for signal integrity if the DE is enabled and another driver is actively driving the bus).

    -Bobby

  • 0 in reply to BOBBY
    Prodigy 20 points

    Bobby,

    Thanks for important info. Your comprehensive answer helped me to close questionable item.

    Best Regards,

    Semyon