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User's Guide
SLOU235 – July 2008
Isolated RS-485 EVM
This User Guide details evaluation module (EVM) operation of the factory installed isolated ISO3082
transceiver. The ISO3082 EVM may be reconfigured by a user for use with the ISO15, ISO35, ISO3080,
and ISO3086 or ISO3088 isolators. Contact a field representative or TI if a factory installed version of one
these devices is desired.
This Guide explains the user configurable I/O loads for the half-duplex and full-duplex EVM configurations,
and presents a typical lab setup and typical output waveform.
CAUTION
Please note that while these devices provide galvanic isolation of up to 4000 V,
this EVM cannot be used for isolation voltage testing. It is designed for the
evaluation of device operating parameters only and may be damaged if high
voltage (> 5.5 V) is applied anywhere in the circuit.
Contents
1 Introduction ................................................................................................................... 2
1.1 Overview ............................................................................................................. 2
1.2 The Functional Configurations of the Isolated RS-485 Transceivers ........................................ 2
1.3 The Isolated RS-485 EVM ........................................................................................ 3
1.4 The Isolated RS-485 EVM Half-Duplex Configuration ......................................................... 6
1.5 The Isolated RS-485 EVM Full-Duplex Configuration ......................................................... 7
2 EVM Setup and Operation .................................................................................................. 9
2.1 Overview ............................................................................................................. 9
List of Figures
1 The ISO15, ISO3082 and ISO3088 Half-Duplex Function Diagram and Pinout .................................... 2
2 The ISO35, ISO3080, and ISO3086 Full-Duplex Function Diagram and Pinout .................................... 2
3 The Isolated RS-485 EVM Schematic .................................................................................... 4
4 The Half-Duplex Operation Schematic .................................................................................... 6
5 The Full-Duplex Operation Schematic ................................................................................... 8
6 Basic ISO3082 Half-Duplex EVM Operation ........................................................................... 10
7 Typical Output Waveform ................................................................................................. 10
List of Tables
1 Isolated RS-485 EVM Connections ....................................................................................... 5
2 Half-Duplex EVM Connections ............................................................................................. 7
3 Full-Duplex EVM Connections ............................................................................................. 9
SLOU235 – July 2008 Isolated RS-485 EVM 1
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