TIDA-010026

Robust interface reference design for EnDat2.2 absolute encoders

TIDA-010026

Design files

Overview

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.

Features
  • 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

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

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

TIDUEL7.PDF (16528 K)

Reference design overview and verified performance test data

TIDRYY1.PDF (365 K)

Detailed schematic diagram for design layout and components

TIDRYY2.PDF (55 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRYY3.PDF (234 K)

Detailed overview of design layout for component placement

TIDRYY5.ZIP (1240 K)

Files used for 3D models or 2D drawings of IC components

TIDCFA2.ZIP (1311 K)

Design file that contains information on physical board layer of design PCB

TIDRYY4.PDF (1079 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

TPS621253V-17V, 300mA Buck Converter With Adjustable Enable Threshold And Hysteresis

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck modules (integrated inductor)

TPS8215017V Input 1A Synchronous Step-Down Converter MicroSiP™ Module With Integrated Inductor

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Direction-controlled voltage translators

SN74LVC2T452-Bit Dual Supply Transceiver with Configurable Voltage-Level Shifting and 3-State Outputs

Data sheet document-pdfAcrobat PDF open-in-new HTML
ESD & surge protection ICs

TVS140114-V bidirectional flat-clamp surge protection device

Data sheet document-pdfAcrobat PDF open-in-new HTML
RS-485 & RS-422 transceivers

THVD14503.3-V to 5-V RS-485 transceiver with ±18-kV IEC ESD protection

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Design guide Robust interface reference design for EnDat 2.2 absolute encoders Feb. 04, 2019

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DEVELOPMENT KIT
LAUNCHXL-F28379D C2000 Delfino MCU F28379D LaunchPad™ development kit

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CONTROLSUITE controlSUITE™ Software Suite: Software and Development Tools for C2000™ Microcontrollers

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