Three Phase AC Voltage and Current Transducer with Isolated DC Analog Outputs Reference Design


Design files


This reference design uses the MSP430F67791A device to accurately measure voltage and current. It also demonstrates using two DC-analog output channels which are capable of being individually configured for voltage output (±10 V) or current output (±24 mA). The advantages of this design is that it measures voltage and current and provides a DC-analog output proportional to the AC inputs. Another advantage is the bidirectional DC-analog output.

The design has six digital outputs that can be used to drive relays. The functionality of the design can be extended to measure power.


  • MSP430F67791A System-on-Chip (SOC) with six simultaneous delta-sigma ADCs for three current and voltage measurement
  • Dual-output 16-bit DAC8563,  XTR300 and ISO7341FC based. Programmable DC-voltage or current output; ±10-V DC or ±24 mA; unidirectional or bidirectional
  • Digital outputs consist of six open collector outputs for driving relays, pulse and provided as open collector
  • Voltage measurement range: 10% to 120% of rated voltage (230 V)
  • Current measurement range: 5% to 200% of rated current (5 A)
  • On-board current transformer and potential divider provided for direct measurement of voltage and current
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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.


Reference design overview and verified performance test data

TIDRHY3.PDF (1053 K)

Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRHY7.ZIP (2413 K)

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

TIDCB60.ZIP (1514 K)

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

TIDRHY6.PDF (4075 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

MSP430 microcontrollers

MSP430F67661APolyphase metering SoC with 6 Sigma-Delta ADCs, LCD, real-time clock, 256KB Flash, 16KB RAM

Data sheet: PDF | HTML
4-20mA signal conditioners

XTR300Industrial Analog Current/Voltage Output Driver

Data sheet: PDF
Digital isolators

ISO7341FCLow-power, quad-channel, 3/1, 25-Mbps, default output low digital isolator

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

TPS7A420150-mA, 28-V, low-IQ, adjustable low-dropout voltage regulator with enable

Data sheet: PDF | HTML
Low-side switches

TPL7407L40-V, 7-ch NMOS array low-side driver

Data sheet: PDF | HTML

CSD17571Q230-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 29 mOhm

Data sheet: PDF | HTML
Precision DACs (≤10 MSPS)

DAC856316-Bit, Dual, Low Power, Ultra-low Glitch, Buffered Voltage Output DAC with 2.5V, 4ppm/°C Reference

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* Design guide Current Transducer With DC Analog Inputs and Digital Outputs Design Guide (Rev. A) PDF | HTML Apr. 20, 2018

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