Case Tamper Detection Reference Design Using Inductive Sensing
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Key Document


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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TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LDC0851  Differential inductive switch for MCU-less applications  Specialty sensors  Sample & Buy View Design Kits & Evaluation Modules
MSP430F67791A  Polyphase metering SoC with 7 Sigma-Delta ADCs, LCD, real-time clock, 512KB Flash, 32KB RAM  Microcontrollers (MCUs)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LDC0851 Download Download
MSP430F67791A Download

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Technical documentation

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Datasheet (1)
Title Type Size (KB) Date
PDF 2588 16 Jan 2016
User guide (1)
Title Type Size (KB) Date
PDF 7283 05 Jun 2017
Design files (5)
Title Type Size (KB) Date
ZIP 446 19 Jun 2017
ZIP 422 19 Jun 2017
ZIP 462 19 Jun 2017
ZIP 404 19 Jun 2017
PDF 65 19 Jun 2017
Related Tools & Software

Reference Designs (1)

Name Part Number Tool Type
Magnetic Tamper Detection Using Low-Power Hall Effect Sensors Reference Design  TIDA-00839  Reference design 

Software development (1)

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