High EMC Immunity RS485 Interface Reference Design for Tamagawa Encoders TIDA-01630 (ACTIVE)

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Key Document

Description

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.

Features
  • 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

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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  5-V RS-485 transceiver with ±18-kV 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
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THVD1550 Download
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TPS22810 Download -
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TPS61240 Download Download
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TPS62162 Download Download

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Technical Documents

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User guides (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

Design Kits & Evaluation Modules  ( 1 )

Name Part Number Tool Type
C2000 Delfino MCU 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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