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Bidirectional RS-485 Fan-Out Hub Reference Design
TIDA-01365
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Key Document

Description

The Bidirectional RS-485 Fan-Out Hub Reference Design (TIDA-01365) documents and tests an RS-485 fan-out hub design where 1:N and N:1 RS-485 signals are aggregated in and out of any bus topology. This design also features automatic direction control, for reduced pin count on microcontrollers, and a DC-to-DC converter using the 24V DC rail typically seen in industrial applications.

Features
  • Allows for bidirectional communication over complex network topologies
  • One master node / Four slave nodes
  • Direction of data automatically controlled (no MCU needed)
  • Supports cable lengths > 1000 m

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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 (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
NA555  Precision Timers  Clocks & timing  Sample & Buy Not Available
SN65HVD3082E  Half-duplex RS-485 transceiver  Interface  Sample & Buy View Design Kits & Evaluation Modules
SN74LV08A  Quadruple 2-Input Positive-AND Gates  Gate  Sample & Buy View Design Kits & Evaluation Modules
TPS54336A  4.5V to 28V Input, 3A, Synchronous Step-Down Converter with Eco-mode(tm)  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
NA555 Download Download
Download Download
SN65HVD3082E Download Download
Download Download
Download Download
SN74LV08A Download Download
Download Download
Download Download
Download Download
Download Download
Download Download
TPS54336A Download Download
Download Download

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Technical documentation

See the Important Notice and Disclaimer covering reference designs and other TI resources.

Datasheet (1)
Title Type Size (KB) Date
PDF 1343 18 Oct 2017
User guide (1)
Title Type Size (KB) Date
PDF 1535 06 Feb 2017
Design files (6)
Title Type Size (KB) Date
ZIP 323 06 Feb 2017
ZIP 331 06 Feb 2017
PDF 762 06 Feb 2017
PDF 164 06 Feb 2017
PDF 41 06 Feb 2017
PDF 100 06 Feb 2017

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