RS-485 Power Over Bus Reference Design
TIDA-00527
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Key Document

Description

This design demonstrates the implementation of a buspowered RS-485 application and allows to evaluate different filters for the DC power. This saves the cost and space for a separate power wiring.

A new preferred approach by using On-off key modulation to transmit RS-485 signals over power line is achieved with THVD8000. By integrating modulation and demodulation circuits, the THVD8000 can increase the frequency content of the baseband data being transmitted. This enables easier DC and AC coupling and system-side interfaces to standard universal asynchronous receivers-transmitters (typically used for RS-485) without any need for special encoding, which is useful in low-data-rate applications. This upgraded approach works well for both DC and AC power without any need for special coding in a microcontroller.

Features
  • Power over Bus for half-duplex RS-485
  • Evaluate different filters
  • One board configurable as master or slave

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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 (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
SN65HVD75  3.3-V half-duplex RS-485 transceiver with IEC ESD, 20 Mbps  Interface  Sample & Buy View Design Kits & Evaluation Modules
SN65HVD82  5V-Supply RS-485 with IEC ESD Protection  Interface  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
SN65HVD75 Download
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SN65HVD82 Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 385 15 May 2015
Design files (3)
Title Type Size (KB) Date
ZIP 326 15 May 2015
PDF 194 15 May 2015
PDF 41 15 May 2015

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