Interface to a 5-V BiSS position encoder reference design


Design files


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.

  • 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 IEC61800-3
  • Wide input (15 to 30 VDC) high-efficiency (>85%) DC/DC power supply for 5-V BiSS (or SSI) encoders with 35 0mA, lowest-ripple (<20-mVpp) output
  • 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 fault
  • Option to shut down encoder power supply in case of fault or to save power when no encoder is connected
  • 3.3-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
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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.

TIDU410.PDF (14782 K)

Reference design overview and verified performance test data

TIDRA43.PDF (353 K)

Detailed schematic diagram for design layout and components

TIDRA44.PDF (48 K)

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

TIDRA45.PDF (303 K)

Detailed overview of design layout for component placement

TIDRA47.ZIP (3121 K)

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

TIDC569.ZIP (195 K)

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

TIDRA46.PDF (1702 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

RS-485 & RS-422 transceivers

SN65HVD773.3V, Full-Duplex RS-485, 12kV IEC ESD, 50Mbps data rate, No Enables

Data sheet: PDF
Buck converters (integrated switch)

TPS54040A3.5V to 42V Input, 0.5A Step-Down Converter with Eco-Mode

Data sheet: PDF | HTML
Buck modules (integrated inductor)

LMZ14201SIMPLE SWITCHER® 6V to 42V, 1A Power Module in Leaded Surface Mount TO Package

Data sheet: PDF | HTML
Direction-controlled voltage translators

SN74AVC8T2458-Bit Dual-Supply Bus Transceiver with Configurable Voltage-Level Shifting and 3-State Outputs

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TLV700200-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable

Data sheet: PDF | HTML
eFuses & hot swap controllers

TPS247502.5-V to 18-V, 3mΩ, 0.01-12A eFuse with driver for external blocking FET and latch off

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Interface to a 5-V BiSS Position Encoder (TIDA-00175) Jun. 20, 2014
Technical article Designing an EMC-compliant interface to motor position encoders – Part 6 PDF | HTML Nov. 20, 2015

Related design resources

Reference designs

TIDEP0022 ARM MPU with Integrated BiSS C Master Interface Reference Design

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