Robust interface reference design for EnDat2.2 absolute encoders
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Key Document


This reference design demonstrates a robust interface to EnDat 2.2 Encoders. That shows EMC immunity, particularly immunity against fast transients such as inverter switching noise. The Encoder supply voltage is configurable and integrates protection against short circuit to prevent damage due to cable short or miss wiring and diagnostic feedback to detect the fault. The logic interface supports 3.3V down to 1.8V I/O. The design is compatible to TI LaunchPad™ development kit for easy evaluation of EnDat2.2 with the C2000™ MCU. This design has been tested up to 100-m cable length with several EnDat 2.2 encoders.

  • Exceed HEIDENHAIN EnDat 2.2 clock frequency of 16 MHz up to 20m, 8 MHz up to 100m cable length
  • Highly robust interface with high EMC immunity thanks to wide supply range 3.3-V to 5V, half-duplex RS-485 transceiver (THVD1450), 50-Mbaud, with ±15V common mode range, 16-kV IEC-ESD and 4-kV EFT
  • Design tested to meet EMC immunity requirements for ESD(IEC61000-4-2), EFT(IEC61000-4-4) and surge(IEC61000-4-5) with levels and pass criterion  according to IEC61800-3
  • Configurable encoder Voltage default 8 V with low-ripple (<50mVpp) output meets Endat2.2 specification
  • Encoder supply protected 250 mA nominal output current with short circuit protection and power good feedback for diagnostic
  • Logic interface default 3.3 V I/O to host processors like a C2000 MCU or Sitara® processor to run the EnDat 2.2 master software

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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
THVD1450  3.3-V to 5-V RS-485 transceiver with ±18-kV IEC ESD protection  Interface  Sample & Buy View Design Kits & Evaluation Modules
TPS62125  3V-17V, 300mA Buck Converter With Adjustable Enable Threshold And Hysteresis  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
TPS82150  17V Input 1A Synchronous Step-Down Converter MicroSiP™ Module With Integrated Inductor  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
TVS1401  14-V bidirectional flat-clamp surge protection device  Circuit protection ICs  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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THVD1450 Download Download
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TPS62125 Download Download
TPS82150 uSiP (SIL)| 8 Download Download
TVS1401 Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 16528 04 Feb 2019
Design files (6)
Title Type Size (KB) Date
ZIP 1311 04 Feb 2019
ZIP 1240 04 Feb 2019
PDF 1079 04 Feb 2019
PDF 234 04 Feb 2019
PDF 55 04 Feb 2019
PDF 365 04 Feb 2019
Related Tools & Software

Reference Designs (2)

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 

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