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SN65HVD3082E: Design a repeater for MVB (Multi Function Vehicle Bus) using RS 485 Trans receiver

Tulika Hathi
Prodigy 20 points
Part Number: SN65HVD3082E
Other Parts Discussed in Thread: THVD1450, THVD1429

I need to design repeater for MVB (Multi Function Vehicle Bus) for ESD mode.

As it is based on RS 485 logical levels, i am thinking of using RS 485 trans receiver.

My application is to just boost/amplify the data signal coming from master device to slave.

Here are some details about the data bus:

  • Communication rate : 1.5 Mbps data rate using Manchester II encoding.
  • AP.ESD : The positive wire of the differential pair with RS485 logical levels for connection  to MVB connectors with ESD interface.
  • AN.ESD : The negative wire of the differential pair with RS485   logical levels for connection to MVB connectors with ESD interface.

If not SN65HVD3082E IC, Can you suggest some different variants too?

Thanks Alot.

  • 0
    TI__Guru 62910 points
    Hello Tulika,

    It sounds like SN65HVD3082E should work, but I wanted to point out a couple of other options.

    If you need to withstand high voltages on the bus lines (for example, to tolerate short circuits to power rails), then you could evaluate SN75HVD1782. This device is available in an automotive qualified version in case that is needed.

    If you need enhanced ESD tolerance, then you could evaluate THVD1450. This device also has a larger differential output magnitude, so it may reduce the need for signal repeaters.

    If the application may be subject to large voltage or current surges, you could evaluate THVD1429. This device is similar to THVD1450 but has a TVS diode integrated for surge protection.

    Regards,
    Max
  • 0 in reply to Max Robertson
    Prodigy 20 points

    Hello Max,

    Thank you for your reply and your suggestion.

    Can you please help me suggest specific schematic for the same as i don't have that much expertise on this subject.

    Attach below is the description of my data signal.

    Thanks alot.

  • 0 in reply to Tulika Hathi
    TI__Guru 62910 points
    Hi Tulika,

    You want to place a repeater somewhere along this differential bus so that it re-drives the differential signaling going in both directions, right? If so, you could reference this circuit:

    www.ti.com/.../TIDA-01365

    It is designed to repeat signals between 1 master and N slave nodes, but it could be easily adapted to be a 1:1 repeater as well.

    Max