Low-Cost Three-Phase Electricity Meter Reference Design TIDM-THREEPHASEMETER-F449 (ACTIVE)

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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

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LMV324  Quad Low-Voltage Rail-to-Rail Output Operational Amplifier – see LMV324A for upgraded version  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
MSP430F449  16-Bit Ultra-Low-Power MCU, 60kB Flash, 2048B RAM, 12-Bit ADC, 2 USARTs HW Multiplier, 160 Seg LCD  Microcontrollers (MCU)  Sample & Buy View Design Kits & Evaluation Modules
TPS770  10-V, 50-mA, Low-Iq, Low-Dropout Linear Regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LMV324 Download Download
Download Download
MSP430F449 Download -
TPS770 Download Download

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Technical Documents

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Design files (3)
Title Type Size (KB) Date
ZIP 163 27 Feb 2014
PDF 103 27 Feb 2014
ZIP 22 27 Feb 2014
Related Tools & Software

Software (1)

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