TIDA-00175 Reference Design

Texas Instruments

Interface to a 5-V BiSS position encoder reference design

Description

This reference design implements a hardware interface based on the BiSS standard for position or rotary encoders. It supports both BiSS point-to-point and BiSS bus configurations. The building blocks include the power supply for a 5-V BiSS encoder with innovative smart eFuse technology and robust full-duplex RS-485 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 BiSS (or SSI) 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
  • 3.3-V RS-485 full-duplex transceivers with IEC-ESD meets BiSS clock frequency (10 Mhz)Design meets EMC immunity requirements for ESD: fast transient burst and surge according to IEC61800-3Wide input (15 to 30 VDC) high-efficiency (>85%) DC/DC power supply for 5-V BiSS (or SSI) encoders with 35 0mA: lowest-ripple (Protected power supply with innovative eFuse technology with inrush current limitation and  protection against over-current: over- and under-voltage and disconnect in case of faultOption to shut down encoder power supply in case of fault or to save power when no encoder is connected3.3-V interface with level shifter to also support 2.5-V or 1.8-V I/O interface to processors to run the BiSS (or SSI) master
Applications
  • Motor diagnostics & monitoring
  • Servo drive position feedback
  • Servo drive control module
  • AC drive position feedback
  • Servo drive position sensor
  • Servo drive functional safety module
  • Commutation sensor
  • MRI
  • Robot servo drive
  • Operation tables
Product Categories
  • Interface

Parts

Part Number Name Companion Part
LMZ14201 LMZ14201 Buy Datasheet
SN74AVC8T245 SN74AVC8T245 Buy Datasheet
TPS24750 TPS24750 Buy Datasheet
TPS54040A TPS54040A Buy Datasheet

Bill Of Materials

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Schematic

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Test Data

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Other Documents

Title Updated Type Size (KB)
TIDA-00175 Gerber 19 Aug 2014 ZIP 195
TIDA-00175 Altium 19 Aug 2014 ZIP 3121
TIDA-00175 PCB 19 Aug 2014 PDF 1702
TIDA-00175 Assembly Drawing 19 Aug 2014 PDF 303
TIDA-00175 BOM 19 Aug 2014 PDF 48
TIDA-00175 Schematic 19 Aug 2014 PDF 353