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TIDA-00839

Magnetic Tamper Detection Using Low-Power Hall Effect Sensors Reference Design

Design files

TIDA-00839

Design files

Overview

Magnetic tampering can paralyze any transformer in an energy measurement system, which may potentially lead to the system being unable to be powered properly or unable to correctly register the energy consumed by a load.  This design implements a Class 0.2  three-phase energy measurement system that detects magnetic tampering using hall sensors.  Magnetic tamper detection is enabled when running from both main and backup power sources.  Methods are used to reduce the current consumption of the hall sensors to increase battery life when running from the backup power source.

Features
  • Bop =±6.9 mT, Sensor Brp =±3.5mT
  • Support for Backup Power Sources
  • Software Power Duty-Cycling Reduces Current Consumption per Sensor to < 2 µA
  • Three-Phase Energy Measurement Exceeds Class 0.2 Accuracy Requirements from ANSI and IEC
  • TI Energy Library Firmware Calculates All Energy Measurement Parameters Including Active and Reactive Power; Active and Reactive Energy; Root Mean Square (RMS) Current and Voltage; Power Factor; and Line Frequency
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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.

download Design guide — TIDA-00839
TIDUB69.PDF (3284 K)

Reference design overview and verified performance test data

download Schematic — TIDA-00839
TIDRJ34.PDF (62 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIDA-00839
TIDRJ35A.PDF (210 K)

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

download CAD/CAE symbol — TIDA-00839
TIDRJ37.ZIP (413 K)

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

download Gerber file — TIDA-00839
TIDCBI1.ZIP (331 K)

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

download PCB layout — TIDA-00839
TIDRJ36.PDF (277 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

TPS54060 — 3.5V to 60V Input, 0.5A Step-Down Converter with Eco-Mode

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Digital isolators

ISO7320C — Low-power, dual-channel, 2/0, 25-Mbps digital isolator

Data sheet: PDF | HTML
Digital isolators

ISO7321C — Low-power, dual-channel, 1/1, 25-Mbps digital isolator

Data sheet: PDF | HTML
Flyback controllers

UCC28910 — 700V Flyback switcher with constant-voltage constant-current and primary-side control

Data sheet: PDF | HTML
Hall-effect latches & switches

DRV5032 — Low power (5 Hz, <1µA), low voltage (up to 5.5V) switch

Data sheet: PDF | HTML
Hall-effect latches & switches

DRV5033 — High voltage (up to 38V), high bandwidth (up to 30 kHz) omnipolar switch

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS709 — 150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection and enable

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430F67791A — Polyphase metering SoC with 7 Sigma-Delta ADCs, LCD, real-time clock, 512KB Flash, 32KB RAM

Data sheet: PDF | HTML
RS-232 transceivers

TRS3232 — 3- to 5.5-V dual channel 250kbps RS-232 line driver/receiver with +/-15-kV ESD protection

Data sheet: PDF | HTML

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Software

Technical documentation

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Type Title Date
* Design guide Magnetic Tamper Detection Using Low-Power Hall Effect Sensors Design Guide Jan. 07, 2015
Technical article You can be an electromechanical engineer Nov. 10, 2017
Technical article Meter anti-tampering: Stopping those pesky meter tamperers Jan. 12, 2016

Related design resources

Reference designs

REFERENCE DESIGN
TIDA-00601 — Multi-phase Energy Measurement with Isolated Shunt Sensors Reference Design TIDM-3PHMETER-ROGOWSKI — Implementation of a 3-Phase Rogowski Coil Based Watt Hour Meter Reference Design TIDM-AUX-MODULE — Battery Management and Auxiliary Power Supply Options for E-Meters

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