Interface to a 5V BiSS Position Encoder Reference Design

(ACTIVE) TIDA-00175

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Key Document

Description

This TI Design implements a hardware interface solution 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 5V BiSS encoder – with innovative smart e-Fuse technology - and robust full-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 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
  • 3.3V RS-485 full-duplex transceivers with IEC-ESD meets BiSS clock frequency (10Mhz)
  • Design meets EMC immunity requirements for ESD, Fast Transient Burst and Surge according to IEC61800-3
  • Wide input (15-30VDC) high-efficiency (>85%) DCDC power supply for 5V BiSS (or SSI) encoders with 350mA, lowest-ripple (<20mVpp) 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.
  • 3.3V interface with level shifter to also support 2.5V or 1.8V I/O interface to processors to run the BiSS (or SSI) Master

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Design Files

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Bill of Materials (BOM)

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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
SN65HVD77  3.3V, Full-Duplex RS-485, 12kV IEC ESD, 50Mbps data rate, No Enables  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
SN65HVD77 Download
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SN74AVC8T245 Download Download
Download Download
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TLV700 Download Download
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TPS24750 Download
TPS54040A Download

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Technical Documents

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

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 14782 20 Jun 2014 0
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 195 19 Aug 2014 0
ZIP 3121 19 Aug 2014 0
PDF 1702 19 Aug 2014 0
PDF 303 19 Aug 2014 0
PDF 48 19 Aug 2014 0
PDF 353 19 Aug 2014 0
Related Tools & Software

Reference Designs  ( 1 )

Name Part Number Tool Type
ARM MPU with Integrated BiSS C Master Interface Reference Design  TIDEP0022  TI Designs

Design Kits & Evaluation Modules  ( 1 )

Name Part Number Tool Type
AM437x Industrial Development Kit (IDK)  TMDXIDK437X  Development Kits 

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