Isolated RS-232 to UART Converter Reference Design


Design files


This design implements an isolated data converter that utilizes residual power from the interface to power itself. This removes the requirement for expensive power transmission across the isolation boundary. By easily enabling the ubiquitous RS-232 connection on an electric meter, features like factory configuration and calibration can be performed by a wide range of test station hardware.

The 2.5kVRMS isolation boundary ensures that field technicians can safely connect to an e-meter, even after it is installed, to perform diagnostics, data retrieval, and field firmware updates.

The robust interface is installed, to perform diagnostics, data retrieval and field firmware updates. The robust interface is designed for data rates well beyond the RS-232 standard, to ensure that isolation will never be the limiting factor in a design.

  • High voltage RS-232 isolation
  • Bit rates up to 1Mbps
  • 2.5kVRMS operating isolation boundary per UL
  • Integrated power harvesting for isolation and RS-232 transceiver
  • Operates with 5V to 12V RS-232 drivers
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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.

TIDU298.PDF (3607 K)

Reference design overview and verified performance test data

TIDR660.PDF (23 K)

Detailed schematic diagram for design layout and components

TIDR661.PDF (72 K)

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

TIDR663.ZIP (41 K)

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

TIDC447.ZIP (32 K)

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

TIDR662.PDF (60 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Digital isolators

ISO7421Dual-channel, 1/1, 1-Mbps digital isolator

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS763150-mA, 10-V, low-dropout voltage regulator with enable

Data sheet: PDF | HTML
RS-232 transceivers

TRS32323- to 5.5-V dual channel 250kbps RS-232 line driver/receiver with +/-15-kV ESD protection

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Self-Powered Isolated RS-232 to UART Interface Design Guide Apr. 23, 2014

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