High EMC Immunity RS485 Interface Reference Design for Tamagawa Encoders
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.

Description & Features

Technical documentation

Support & Training

Order Now

See the Important Notice and Disclaimer covering reference designs and other TI resources.

Key Document


EMC immunity, especially immunity against inverter switching noise, is important for positioning encoder feedback systems of industrial drives. This design demonstrates a high EMC immunity RS485 transceiver solution which can be used on both the drive and encoder, such as Tamagawa™, EnDat 2.2, BiSS®, and so forth. The design supports a wide input voltage of 5 V. A connector with 3.3-V logic I/O signals and a 3.3-V power supply allows direct interface with the host processor to run the master protocol and power the processor. To meet the supply range of the selected encoder, the design offers an output voltage to the encoder equal to the Vin. This design’s power supply offers protection against overvoltage and short circuit, according to the selected encoder’s voltage range, to prevent damage during a cable short. The design has been tested for up to a 50-m cable length with the Tamagawa encoder.

  • 5-V half-duplex RS485 transceiver with up to 50-Mbps baud rate and improved EMC immunity against IEC61000-4-4
  • Hardware supports 2-wire interfaces standards such as Tamagawa or 4-wire RS485 interface standards like EnDat2.2 and BiSS
  • 5-V supply half-duplex RS485 transceiver THVD1550 with 16kV IEC-ESD and 4kV EFT eliminates cost for external ESD components
  • Highest immunity against IEC61000-4-4 Fast Electrical Transients versus other industry standard RS485 transceivers validated in system tests
  • Designed to meet IEC61800-3 EMC immunity for variable speed drives without the need for additional protection devices such as TVS diodes when used in applications with Encoders using shielded cables
  • The design is in BoosterPack™ Plug-in Module form factor with a connector compatible to the TI LaunchPad™ Development Kit for easy evaluation of Tamagawa with a C2000™ MCU

See the Important Notice and Disclaimer covering reference designs and other TI resources.


Schematic/Block Diagram

Quickly understand overall system functionality.

Download Schematic

Design Guide

Get results faster with test and simulation data that's been verified.

Download Design Guide

Design Files

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

Download Design Files

TI Devices (5)

Order samples, get tools and find more information on the TI products in this reference design.

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

Texas Instruments and Accelerated Designs, Inc. have collaborated together to provide TI customers with schematic symbols and PCB layout footprints for TI products.

Step 1: Download and install the free download.

Step 2: Download the Symbol and Footprint from the CAD.bxl file table.

Technical documentation

See the Important Notice and Disclaimer covering reference designs and other TI resources.

User guide (1)
Title Type Size (KB) Date
PDF 2443 09 Feb 2018
Design files (6)
Title Type Size (KB) Date
ZIP 1575 26 Mar 2018
ZIP 1452 26 Mar 2018
PDF 1307 26 Mar 2018
PDF 275 26 Mar 2018
PDF 149 26 Mar 2018
PDF 503 26 Mar 2018
Related Tools & Software

Hardware development (1)

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

Software development (1)

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

Support & training

TI E2E™ forums with technical support from TI engineers

Search our extensive online knowledge base where millions of technical questions and answers are available 24/7.

Search answers from TI experts

Content is provided 'AS IS' by the respective TI and Community contributors and does not constitute TI specifications.
See terms of use.

If you have questions about quality, packaging, or ordering TI products visit our Support page.

Technical articles