TIDA-00839

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

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

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUB69.PDF (3284 K)

Reference design overview and verified performance test data

TIDRJ34.PDF (62 K)

Detailed schematic diagram for design layout and components

TIDRJ35A.PDF (210 K)

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

TIDRJ37.ZIP (413 K)

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

TIDCBI1.ZIP (331 K)

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

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)

TPS540603.5V to 60V Input, 0.5A Step-Down Converter with Eco-Mode

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

ISO7320CLow-power, dual-channel, 2/0, 25-Mbps digital isolator

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

ISO7321CLow-power, dual-channel, 1/1, 25-Mbps digital isolator

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

UCC28910700V Flyback switcher with constant-voltage constant-current and primary-side control

Data sheet document-pdfAcrobat PDF open-in-new HTML
Hall-effect latches & switches

DRV5032Low power (5 Hz, <1µA), low voltage (up to 5.5V) switch

Data sheet document-pdfAcrobat PDF open-in-new HTML
Hall-effect latches & switches

DRV5033High voltage (up to 38V), high bandwidth (up to 30 kHz) omnipolar switch

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TPS709150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection and enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
MSP430 microcontrollers

MSP430F67791APolyphase metering SoC with 7 Sigma-Delta ADCs, LCD, real-time clock, 512KB Flash, 32KB RAM

Data sheet document-pdfAcrobat PDF open-in-new HTML
RS-232 transceivers

TRS32323- to 5.5-V dual channel 250kbps RS-232 line driver/receiver with +/-15-kV ESD protection

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

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Software

Support software

TIDA-00839 Software (Rev. A) – TIDCBI2A.ZIP (7501 K)

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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