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

(ACTIVE) TIDM-TWOPHASEMETER-I2040

Description & Features

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Key Document

Description

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.

Features
  • 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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Schematic/Block Diagram

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Design Guide

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Source Files

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Bill of Materials (BOM)

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TI Devices (6)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ISO7220A  Dual Channel, 2/0, 1Mbps Digital Isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
ISO7221A  Dual Channel, 1/1, 1Mbps Digital Isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
MSP430F6638  MSP430F6638 Mixed Signal Microcontroller  MSP430 ultra-low-power MCUs  Sample & Buy View Design Kits & Evaluation Modules
MSP430I2041  16MHz MCU with four 24-bit Sigma-Delta ADCs, two 16-bit High Res Timers, 32KBKB flash, 2KB RAM  MSP430 ultra-low-power MCUs  Sample & Buy View Design Kits & Evaluation Modules
TPD4E004  4-Channel ESD Protection Array for High-Speed Data Interfaces  Circuit protection  Sample & Buy View Design Kits & Evaluation Modules
TPS5401  3.5V to 42V Input, 0.5 A Step Down Converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ISO7220A Download Download
Download -
ISO7221A Download Download
Download -
MSP430F6638 Download Download
Download -
MSP430I2041 Download Download
Download Download
TPD4E004 Download Download
TPS5401 Download -

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 2915 20 Jul 2016 0
Design files (5)
Title Abstract Type Size (KB) Date Views
ZIP 459 03 Oct 2014 0
ZIP 257 03 Oct 2014 0
PDF 244 03 Oct 2014 0
PDF 128 03 Oct 2014 0
ZIP 243 03 Oct 2014 0

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