Reference Design for an Interface to a Position Encoder with EnDat 2.2

(ACTIVE) TIDA-00172

Description & Features

Technical Documents

Support & Training

Order Now


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

Key Document

Description

This TI Design implements a hardware interface solution based on the HEIDENHAIN EnDat 2.2 standard for position or rotary encoders. The building blocks include the power supply for the encoder – with innovative smart e-Fuse technology - and robust half-duplex RS485 transceivers, including line termination and EMC protection. An auxiliary power supply and logic level interface with adjustable I/O voltage level is provided to connect to subsequent MCUs and MPUs that would run the EnDat 2.2 Master protocol stack. This design is fully tested to meet EMC immunity requirements for ESD, Fast Transient Burst and Surge according to IEC61800-3.

Features
  • Design meets EMC immunity requirements for ESD, Fast Transient Burst and Surge according to IEC61800-3
  • High-speed RS-485 transceivers robust to 15kV ESD immunity
  • Wide input (15-30VDC) high-efficiency (>85%) DCDC power supply configurable from 3.6V to 14V (defaulted to 8V) with 200mA, low-ripple (<20mVpp) output
  • Protected power supply with innovative eFuse technology to protect against over-current, over-power, over- and under-voltage and disconnect in case of fault.
  • Option to shut down encoder power supply in case of fault or to save power when no encoder is connected.
  • Level shifter to support 3.3V, 2.5V or 1.8V I/O interface to processors like Sitara AM4x for EnDat 2.2 Master.


  




TI Devices (6)

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
LMZ14201  SIMPLE SWITCHER® 6V to 42V, 1A Power Module in Leaded Surface Mount TO Package  Non-Isolated Module  Sample & Buy View Design Kits & Evaluation Modules
SN65HVD78  3.3 V Half-Duplex RS-485, with IEC ESD, 50 Mbps  Interface  Sample & Buy View Design Kits & Evaluation Modules
SN74AVC8T245  8-Bit Dual-Supply Bus Transceiver with Configurable Voltage-Level Shifting and 3-State Outputs  Voltage Level Translation  Sample & Buy View Design Kits & Evaluation Modules
TLV700  200mA, Low IQ, Low Dropout Regulator for Portables  Linear Regulator (LDO)  Sample & Buy View Design Kits & Evaluation Modules
TPS24750  18V, 12A, 3mΩ eFuse with IMON and PG  Protection, Monitoring and Hot Swap  Sample & Buy View Design Kits & Evaluation Modules
TPS54040A  3.5V to 42V Input, 0.5A Step-Down Converter with Eco-Mode  Step-Down (Buck)  Sample & Buy View Design Kits & Evaluation Modules

Technical Documents
User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 7780 28 May 2014 2,700
Solution guides (1)
Title Abstract Type Size (KB) Date Views
PDF 2354 20 Nov 2015 38,229
Design files (5)
Title Abstract Type Size (KB) Date Views
ZIP 185 19 Jun 2014 48
ZIP 2340 19 Jun 2014 73
PDF 130 19 Jun 2014 94
PDF 209 19 Jun 2014 84
PDF 198 19 Jun 2014 526
Related Tools & Software

Software (1)



Support & Training

 

Support

How can we help you?

Please select a support topic below:

Blogs

Wikis

Visit the TI Wiki