Isolated auto-polarity RS-485 transceiver reference design


Design files


This reference design demonstrates an isolated RS-485 bus node with automatic correction of a reversed bus signal polarity caused by cross-wire faults. The design provides transient protection protecting the signal path against ESD, EFT, and surge transients specified in the IEC 61000 family of transient immunity standards. An isolated DC-DC converter provides power supply across the isolation barrier utilizing the push-pull converter principle.

  • 6kV peak isolation    
  • IEC 61000-4-2 up to 16kV    
  • IEC 61000-4-4 up to 4kV    
  • IEC 61000-4-5 up to 1kV    
  • Data rate up to 250kbps
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU420.PDF (652 K)

Reference design overview and verified performance test data

TIDR820.PDF (121 K)

Detailed schematic diagram for design layout and components

TIDR821.PDF (104 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDC492.ZIP (98 K)

Design file that contains information on physical board layer of design PCB


Includes TI products in the design and potential alternatives.

RS-485 & RS-422 transceivers

SN65HVD888Bus-Polarity Correcting RS-485 Transceiver with IEC-ESD Protection

Data sheet: PDF | HTML
Digital isolators

ISO7641FMQuad-channel, 3/1, 150-Mbps, default output low digital isolator

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS763150-mA, 10-V, low-dropout voltage regulator with enable

Data sheet: PDF | HTML
Transformer drivers

SN6501Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Design guide Isolated Auto-Polarity RS-485 Transceiver (TIDA-00263 Verified Design) Jun. 25, 2014

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