Low-Cost Single/Dual-Phase Isolated Electricity Measurement Reference Design


Design files


The design implements a low-cost single- or dual-phase electricity measurement solution. The design separates a small metrology MCU from the host MCU, providing both protection from the AC mains and also isolation of the energy measurement function from corruption by other software. The small, low-cost metrology MCU achieves IEC/ANSI Class 1 accuracy and calculates active and reactive power and energy. This design is implemented using Current Transformer sensors for single and dual-phase measurement. It can also be easily modified for single-phase measurement with shunt resistor sensors.

  • Low-cost single-/dual-phase electricity measurement with IEC/ANSI Class 1 accuracy
  • 4KV peak Isolation between metrology and host ensure Mains and the metrology subsystem are isolated from other subsystems
  • Small 28-pin TSSOP package of metrology MCU reduces board space and simplifies layout to minimize PCB complexity.
  • 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
  • Low power consumption of metrology MCU reduces cost of power supply
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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.

TIDU482A.PDF (2915 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


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

TIDC674.ZIP (243 K)

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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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MSP430 microcontrollers

MSP430F663820 MHz MCU with 256KB Flash, 16KB SRAM, 12-bit ADC, 12-bit DAC, comparator, DMA, 160 seg LCD, USB

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MSP430 microcontrollers

MSP430I204116-MHz metering AFE with 4 24-bit sigma-delta ADCs, 2 16-bit timers, 32KB Flash, 2KB RAM

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Technical documentation

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Type Title Date
* Design guide Low-Cost Single or Dual-Phase Isolated Electricity Measurement Reference Design (Rev. A) Jul. 20, 2016

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