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Original question:

TIDA-00527: Master A-B signal issues

TIDA-00527: Maximum Signaling Rate and transmission distance

Liu Yang
Expert 5915 points
Part Number: TIDA-00527
Other Parts Discussed in Thread: SN65HVD82, THVD1550

Hi team,

SN65HVD82 is only a RS485 driver chip, and TIDA-00527 is based on this chip and additional power supply on the RS485 signal line.
Please help to confirm after adding the power supply, can the Signaling Rate and transmission distance be evaluated according to the original parameters of SN65HVD82?
And what are the maximum Signaling Rate and transmission distance?

Beat Regards,
Tom Liu

  • 0
    TI__Guru 62910 points

    Hi Tom,

    Yes, as long as the coupling inductances are large enough to not present a load to the higher-frequency RS-485 signaling then the distance achievable would be similar to normal RS-485 transmission - that is, it would be limited primarily by the AC losses of the cable and the jitter tolerances of the UARTs used for serial communication.

    Note that the use of AC coupling capacitances does create a sort of minimum frequency requirement not present in normal RS-485, though.  This is because the series capacitors act as a high-pass filter.  The frequency of the data must be higher enough to be above this filter's corner frequency for reliable transmission.  Note that in many cases this would mean using a higher-rate RS-485 transceiver such as THVD1550 (a p2p update to SN65HVD82 capable of higher speeds).

    Regards,
    Max