Two-Wire Interface to a HIPERFACE DSL® Encoder Reference Design
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Key Document


The TIDA-00177 reference design is an EMC compliant industrial interface to a two-wire HIPERFACE DSL® encoder. Applications include industrial servo drives.

The design features a 3.3-V supply RS485 transceiver and line termination and coupling for encoder power over RS485 as per HIPERFACE DSL specification. The design has been tested up to 100m cable length with an integrated cable, where the encoder’s two-wire twisted pair was integrated in the same motor cable.  The encoder connector output is protected against over-voltage and short circuit to prevent damage to an encoder or during a cable short. The design features an industrial compliant 24-V input with wide range from 18-36V. A 3.3V I/O connector with logic signals for easy interface to a host processor with HIPERFACE DSL Master IP Core is made available.

  • Two-Wire Interface to a HIPERFACE DSL Encoder. Supports HIPERFACE DSL 9.375 MBaud Transfer Rate with Power Over RS485, Cable Length up to 100m
  • 3.3-V Supply Half-Duplex RS485 Transceiver with 12kV IEC-ESD and 4kV EFT
  • Wide Input (18-36V) Non-Isolated Power Supply with Configurable Output Voltage 7V-12V, Default 10.5V, 250mA (3.5A peak) Compliant to HIPERFACE DSL Specification 
  • OV, UV and Precise Over-Current Limit with Short-Circuit Protection Leveraging TI eFuse Technology with Fault Indicator
  • Logic Interface (3.3V I/O) to Host Processor like Sitara for the HIPERFACE DSL Master
  • Designed to meet EMC Immunity for ESD, Fast Transient Burst, and Surge with Levels according to IEC61800-3

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Schematic/Block Diagram

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Design Guide

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Design Files

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TI Devices (6)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD15571Q2  20-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 19.2 mOhm  MOSFETs  Sample & Buy Not Available
LM2903  Dual differential comparator, automotive grade  Amplifiers  Sample & Buy Not Available
LMZ14201  SIMPLE SWITCHER® 6V to 42V, 1A Power Module in Leaded Surface Mount TO Package  Step-down (buck) regulators  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
TPS24750  2.5-V to 18-V, 3mΩ, 0.01-12A eFuse with driver for external blocking FET and latch off  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS5401  3.5V to 42V Input, 0.5 A Step Down Converter  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD15571Q2 WSON (DQK)| 6 Download
LM2903 Download Download
Download Download
Download Download
Download -
Download Download
LMZ14201 Download Download
SN65HVD78 Download
TPS24750 Download
TPS5401 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 15250 01 Sep 2015
Design files (6)
Title Type Size (KB) Date
ZIP 1094 29 Jun 2015
ZIP 3188 29 Jun 2015
PDF 2541 29 Jun 2015
PDF 219 29 Jun 2015
PDF 26 29 Jun 2015
PDF 763 29 Jun 2015

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