Freescale Introduced New Xtrinsic Sensor for Smart Meter Tamper Protection. Energy-efficient 3-axis accelerometer delivers advanced motion detection accuracy and low noise for smart metering and industrial applications. Freescale’s new micro-electromechanical system (MEMS) accelerometer featuring ultra-low power consumption and a simple plug-and-play approach to tilt threshold detection for use in physical tamper protection for smart meter applications. Freescale’s Xtrinsic MMA8491Q energy-efficient accelerometer expands the portfolio to industrial markets requiring wide pin pitch, visually inspectable leads and long product life cycles.

Smart_Meter_Tamper_ProtectionDesigned for applications requiring reduced complexity and advanced system integration, the Xtrinsic MMA8491Q accelerometer for tilt threshold sensing plays an integral role in Freescale’s system-level smart meter reference designs that detect physical tampering. Movement of the meter is detected through the change in tilt angle and communicated to the utility company as a tampering event.

The Xtrinsic MMA8491Q accelerometer was designed to be very flexible and useful for a wide variety of applications beyond smart metering in which orientation needs to be accurately measured – motion detection in gaming consoles and home appliances, for example. The accelerometer also is ideal for tracking asset handling in business and industrial settings and can be employed in eHealth and portable health monitoring systems.

The Xtrinsic MMA8491Q micro-electromechanical system (MEMS) tilt sensor has X-, Y- and Z-axis tilt detect outputs with programmable thresholds. When someone tampers with the smart meter, the movement of the meter is detected through the change in tilt angle and then communicated to the utility company as a tampering event. Physical security can also be detected for other smart grid components including data concentrators, intelligent electronic devices (IEDs) and secure gateways.

Xtrinsic MMA8491Q 3-Axis Accelerometer Features

The Xtrinsic MMA8491Q accelerometer for tilt sensing features X-, Y- and Z-axis tilt threshold detect outputs and operates with reduced power capabilities that intelligently determine when a device should operate in a low-power mode or shut off, helping prolong battery life. Additional features include:

  • Low current consumption at 400 nA per Hz
  • Dedicated enable pin: “On” for trigger one shot measurements; “Off” for shutdown mode and ultra-low current consumption at 10 nA
  • Preconfigured tilt threshold detection triggers for simple plug-and-play integration
  • 3-axis logic outputs (above/below threshold) provide tilt indicators
  • Programmable tilt threshold limits
  • I2C functionality with +/-8 g dynamic range for traditional accelerometer data capture
  • 3 x 3 x 1.05 mm QFN package with solder visual inspectable pins at 0.65 mm pitch
  • Wide range voltage supply functionality at 1.95 V to 3.6 V