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SN65LBC180A: Shor-circuit / Open-circuit bus detection

Motoyasu Hattori
Genius 9045 points
Part Number: SN65LBC180A
Other Parts Discussed in Thread: THVD1452

Hi,

Is it possible to detect Short-circuit bus and Open-circuit bus on SN65LBC180A Receiver Function?   Please advise us.

Thanks and best regards,
M.HATTORI.

  • 0
    TI__Mastermind 26963 points

    Hello M.HATTORI,

    The device doesn't really have a way to "detect" a bus fault, but does has biases for open-circuit conditions.

    The SN65LBC180A only has receiver biasing to output HIGH (/RE = LOW) when the bus is open-circuited (disconnected). This device doesn't have a way to fail-safe HIGH in the case of a shorted condition. 

    Some of TI's newer RS485 devices have built in fail-safe for open circuit, short circuit, and idle bus conditions. I would recommend the THVD1452 device, since this is pin-to-pin compatible, and implements the fail safe technology I just described. Unfortunately this part is out of stock at the moment.

    Regards,

    Tyler