High EMC Immunity RS-485 Interface Reference Design for Absolute Encoders

(ACTIVE) TIDA-01401

Description & Features

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Key Document

Description

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.

Features
  • 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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Design Files

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Bill of Materials (BOM)

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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 translation  Sample & Buy View Design Kits & Evaluation Modules
THVD1550  5V RS-485 Transceivers With ±18kV IEC ESD Protection  Interface  Sample & Buy Not Available
TPS22810  18V, 3A, 79mΩ Load Switch with Adjustable Rise Time, Adj. Quick Output Discharge, & Thermal Shutdown  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS61240  5V, 400mA, 4MHz Step-Up DC/DC Converter  Step-up (boost)  Sample & Buy View Design Kits & Evaluation Modules
TPS62162  3V-17V 1A Step-Down Converters with DCS-Control™  Step-down (buck)  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
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TPS62162 Download Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 814 27 Sep 2017 69
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 1734 27 Sep 2017 23
ZIP 8439 27 Sep 2017 20
PDF 1302 27 Sep 2017 21
PDF 218 27 Sep 2017 17
PDF 199 27 Sep 2017 18
PDF 520 27 Sep 2017 110
Related Tools & Software

Design Kits & Evaluation Modules  ( 1 )

Name Part Number Tool Type
C2000 Delfino MCUs F28379D LaunchPad Development Kit  LAUNCHXL-F28379D  Development Kits 

Software (1)

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


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