Low-Cost Three-Phase Electricity Meter Reference Design


Design files


The design implements a basic three-phase electric meter system using the MSP430F449 smart meter SoC, the LMV324 precision op amps, and TPS76333 LDO regulator . It meets all of the requirements for ANSI C12.20 and IEC-62053 Class 0.5 meters.The MSP430F449 SoC is a low-cost option for engineers developing polyphase energy measurement systems for utility meters and industrial applications. . The LMV324 op amps are used for conditioning the voltage and current signals coming from the current transformers. The design uses a capacitive-drop power supply based on the TPS76333 to provide a low-cost power supply solution. Hardware and software design files are provided to enable calculation of various parameters for three-phase energy measurement, such as RMS current & voltage, active and reactive power and energies, power factor and frequency. With this design developers can quickly determine that the MSP430F449 e-meter SoC meets the requirements for their low-cost smart e-meter.

  • Three-phase electricity meter that meets Class 0.5 accuracy requirements from ANSI and IEC
  • TI Energy Library firmware calculates all energy measurement parameters including active and reactive power and energy, RMS current and voltage, power factor, and line frequency
  • Built-in 160-segment display
  • Powered from three-phase line voltage

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDR430.PDF (103 K)

Detailed schematic diagram for design layout and components

TIDR429.ZIP (22 K)

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

TIDC298.ZIP (163 K)

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


Includes TI products in the design and potential alternatives.

MSP430 microcontrollers

MSP430F4498-MHz MCU with 60-KB flash, 2-KB SRAM, 12-bit ADC, comparator, SPI/UART, 160 seg LCD

Data sheet document-pdfAcrobat PDF
General-purpose op amps

LMV324Quad, 5.5-V, 1-MHz, RRO operational amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TPS77050-mA, 10-V, low-IQ, low-dropout voltage regulator

Data sheet document-pdfAcrobat PDF

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