Reference Design for an Interface to a Position Encoder with EnDat 2.2
TIDA-00172
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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.

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TI Devices (6)

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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  Step-down (buck)  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 (LDO) Regulator for Portables  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS24750  18V, 12A, 3mΩ eFuse with IMON and PG  Power switches  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

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LMZ14201 Download Download
SN65HVD78 Download
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SN74AVC8T245 Download Download
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TLV700 Download Download
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TPS24750 Download
TPS54040A Download
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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 7780 28 May 2014
Design files (5)
Title Type Size (KB) Date
ZIP 185 19 Jun 2014
ZIP 2340 19 Jun 2014
PDF 130 19 Jun 2014
PDF 209 19 Jun 2014
PDF 198 19 Jun 2014
Related Tools & Software

Software (1)



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