Case Tamper Detection Reference Design Using Inductive Sensing


Design files


The physical case surrounding a smart meter is the first line of defense against tampering. Smart meter designs must incorporate some way to detect when the meter case is opened in order to alert service providers to a possible tamper attack.  This reference design implements a new method for the low-power detection of such tampering by using a small, inductive sensor to accurately and reliably determine if the meter case has been opened. This new solution improves system reliability by eliminating mechanical components which can wear out over time. This system is implemented for smart electricity meters but the design techniques can as well be applied to water ,gas, and heat meters.

  • Contactless detection of case tampering events
  • Accurately detects case movement as small as 4mm
  • Single inductive sensor detects opening of terminal block cover and main cover
  • Consumes approximately 2 µA while sampling at 1Hz
  • Immune to DC magnetic tampering
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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.

TIDUD41.PDF (7283 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


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


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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Inductive sensor AFEs

LDC0851Differential inductive switch for MCU-less applications

Data sheet: PDF | HTML
MSP430 microcontrollers

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

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* Design guide Case Tamper Detection Reference Design Using Inductive Sensing Jun. 05, 2017
Technical article An open-and-shut case, part 2: advantages of inductive-based case tamper detection in smart meters Nov. 29, 2018
Technical article An open-and-shut case, part 1: limitations of mechanical case tamper detection in smart meters Nov. 15, 2018

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TIDA-00839 Magnetic Tamper Detection Using Low-Power Hall Effect Sensors Reference Design

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