TIDA-01090

RS-485 Automatic Direction Control Reference Design

TIDA-01090

Design files

Overview

The TIDA-01090 reference design enables half-duplex communication over an RS-485 bus without requiring additional driver-enable/receiver-enable controls.  The design allows for the transceiver used on each node to go into transmit mode automatically when data is being transmitted from a local Microcontroller (MCU) or Universal Asynchronous Receiver/Transmitter (UART) and then transition back into receive mode once the data frame is complete.

Features
  • Automatically enables an RS-485 driver when data is output from an MCU or UART
  • Transitions RS-485 transceiver into receive mode when data is not being transmitted
  • Works with any RS-485 transceiver
  • Low-cost due to minimal number of components
  • Adjustable data frame length via passive component selection
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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.

TIDUBW6.PDF (2835 K)

Reference design overview and verified performance test data

TIDRMF9.PDF (54 K)

Detailed schematic diagram for design layout and components

TIDRMG0.PDF (96 K)

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

TIDRMG1.PDF (70 K)

Detailed overview of design layout for component placement

TIDRMG3.ZIP (298 K)

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

TIDCCC2.ZIP (0 K)

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

TIDRMG2.PDF (421 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

RS-485 & RS-422 transceivers

SN65HVD3082EHalf-duplex RS-485 transceiver

Data sheet: PDF | HTML
Real-time clocks (RTCs) & timers

NA555Precision Timers

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Automatic Direction Control RS-485 Design Guide Jun. 02, 2016

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