Single-Phase Electricity Sub-Meter for Smart Buildings
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Description & Features

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Key Document


The Energy Watchdog design is a complete tool used to measure and display the energy consumption of an individual load in a smart building such as major home appliances. With this tool engineers can quickly evaluate TI’s solution a low-cost energy measurement application. This reference design will speed engineers’ development time as it comes complete with hardware and software design files. The Energy Watchdog design also is expandable to work with TI’s ZigBee and Wifi reference designs to add wireless communications to the end product.

  • Single-phase energy measurement system
  • On-board display for incoming AC voltage, current , frequency, active power, reactive power, apparent power , power factor, and Energy consumption (in kWh )
  • Compatible with input voltage from 110V-240V
  • Simple push buttons for adjusting LCD display and time settings
  • Interface to TI communications modules for ZigBee(CC2538EM-RD), Wifi(CC3000EM-RD), and Sub-1GHz RF for Wireless M-Bus.

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Schematic/Block Diagram

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Test Data

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TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
MSP430AFE253  12 MHz metering AFE with 3 24-bit Sigma-Delta ADCs, 16KB Flash, 512B RAM  Microcontrollers (MCUs)  Sample & Buy View Design Kits & Evaluation Modules
TPS770  50-mA, 10-V, low-IQ, low-dropout voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
MSP430AFE253 Download Download
TPS770 Download Download

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Technical documentation

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User guide (2)
Title Type Size (KB) Date
PDF 683 24 Jan 2014
PDF 314 23 Jan 2014
Design files (3)
Title Type Size (KB) Date
ZIP 2263 23 Jan 2014
PDF 87 23 Jan 2014
ZIP 30 23 Jan 2014

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