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SN65LBC179: SN65LBC179 Compatibility with SN65HVD75DRBR

SS
Prodigy 230 points
Part Number: SN65LBC179

Tool/software:

Hello, 

I have Biss-C interface between controller and encoder boards. On the encoder board, I have SN65LBC179 (driver) with VCC at 5V. But, on the controller (receiver) end SN65HVD75DRBR is operated at 3.3V. Clock is generated from the controller with 3.3V reference, and differential signals are received on the encoder board with 5V reference. Is this setup acceptable or do I need any level translation?

Thanks.

  • 0
    TI__Expert 5676 points

    Hello,

    Can you show a schematic of the driver and receiver so I can properly understand the voltages you are referencing?

    SS said:
    differential signals are received on the encoder board with 5V reference

    Can you clarify what you mean by 5V reference?

    Both devices you mentioned have a common mode of -7V to 12V, even with those devices having different VCC supplies. Communication over the bus in this scenario will not be a concern assuming I understand your question correctly.

    Best,

    Ethan

  • +1
    Guru 287310 points

    RS-485 differential signals are about 2.2 V, regardless of the supply voltage. All transceivers are compatible.