High EMC immunity RS-485 interface reference design for absolute encoders
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Key Document


This high EMC immunity reference design demonstrates a RS-485 transceiver to use on both the drive and within encoders such as: EnDat 2.2, BiSS®, Tamagawa™, etc. EMC immunity, particularly immunity against inverter switching noise, is important for position encoder feedback systems within industrial drives. This design supports a wide input voltage range (used as output voltage to the encoder) from 5 to 15 V (12 V nom) in order to meet the wide supply range of encoders. The power supply of this design includes protection against overvoltage and short circuit according to the selected encoder’s voltage range to prevent damage during a cable short. The BoosterPack™ plug-in module form factor with connector compatible to TI LaunchPad™ development kit is included for easy evaluation of EnDat, BiSS, and other systems with the C2000™ MCU. This reference design has been tested up to 100-m cable length with EnDat 2.2 encoders.

  • 5-V, half-duplex RS-485 transceiver (THVD1550), 50-Mbaud, with 16-kV IEC-ESD and 4-kV EFT eliminates cost for external ESD components
  • Design achieves highest immunity within industry against IEC 61000-4-4 fast electrical transients
  • Supports 4-wire RS-485 interface standards such as EnDat2.2, BiSS or 2-wire interfaces standards such as Tamagawa™
  • Hardware can be used as both a drive and an encoder interface due to configurable clock direction
  • Designed to meet IEC 61800-3 EMC immunity

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Schematic/Block Diagram

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Design Guide

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Design Files

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TI Devices (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
SN74LVC2T45  2-Bit Dual Supply Transceiver with Configurable Voltage-Level Shifting and 3-State Outputs  Voltage level translators  Sample & Buy View Design Kits & Evaluation Modules
THVD1550  5-V RS-485 transceiver with ±18-kV IEC ESD protection  Interface  Sample & Buy Not Available
TPS22810  18-V, 3-A, 79-mΩ load switch with adj. rise time and adj. output discharge  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS61240  2.3-V to 5.5-V input range, 3.5-MHz fixed frequency 450-mA boost converter  Step-up (boost) regulators  Sample & Buy View Design Kits & Evaluation Modules
TPS62162  3V-17V 1A Step-Down Converters with DCS-Control™  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
SN74LVC2T45 Download Download
Download Download
Download -
THVD1550 Download
Download Download
TPS22810 Download -
Download Download
TPS61240 Download Download
Download -
TPS62162 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 814 27 Sep 2017
Design files (6)
Title Type Size (KB) Date
ZIP 1734 27 Sep 2017
ZIP 8439 27 Sep 2017
PDF 1302 27 Sep 2017
PDF 218 27 Sep 2017
PDF 199 27 Sep 2017
PDF 520 27 Sep 2017
Related Tools & Software

Hardware development (1)

Name Part Number Tool Type
C2000 Delfino MCU F28379D LaunchPad™ development kit  LAUNCHXL-F28379D  Evaluation board 

Software development (1)

Name Part Number Software Type
controlSUITE™ Software Suite: Software and Development Tools for C2000™ Microcontrollers  CONTROLSUITE  Driver or library 

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