Single-Phase Electricity Sub-Meter for Smart Buildings


Design files


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.

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.

TIDU199.PDF (363 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDC252.ZIP (2263 K)

Detailed schematic diagram for design layout and components

TIDR368.PDF (87 K)

Detailed schematic diagram for design layout and components

TIDR367.ZIP (30 K)

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


Includes TI products in the design and potential alternatives.

Linear & low-dropout (LDO) regulators

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

Data sheet document-pdfAcrobat PDF
MSP430 microcontrollers

MSP430AFE25312 MHz metering AFE with 3 24-bit Sigma-Delta ADCs, 16KB Flash, 512B RAM

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* User guide TIDM-ENERGY-WATCHDOG Single-Phase Sub-Meter for Smart Buildings User's Guide (Rev. A) Jan. 24, 2014
* Test report Single Phase Electricity Sub-Meter for Smart Buildings Test Data Jan. 23, 2014

Support & training

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