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STMicroelectronics

 

STMicroelectronics’ new LIS2DTW12 combines a MEMS three-axis accelerometer and a temperature sensor on a single die, providing a miniature sensing solution for space-constrained and batterysensitive detectors such as shipping trackers, wearable devices and IoT end-points.

Providing temperature measurements accurate to ±0.8°C, its performance is comparable to that of stand-alone standard temperature sensors. These temperature measurements support temperature compensation of the accelerometer’s outputs.

The accelerometer itself offers five power-saving modes and two noise modes which enable developers to optimize power consumption and noise to meet the requirements of their application. It has user-selectable full-scale range from ±2g to ±16g, and measures acceleration at output data rates from 1.6Hz to 1.6kHz.

At just 0.7mm high, the LIS2DTW12 is a thinner package than many integrated motion sensors. It includes various power-saving features to enable the host device to run for longer between charges. These include:

  • 50nA current in power-down mode
  • Low-power modes that bring operating current down to as little as 1μA
  • A dedicated internal engine for processing accelerometer signals, plus a large 32-level FIFO to reduce the need for the host controller to perform power-intensive processing operations

The LIS2DTW12’s internal motion engine performs free-fall and wake-up detection, single-/double-tap recognition, activity/inactivity detection, stationary/motion detection, portrait/landscape detection, and 6D/4D orientation. The LIS2DTW12 is pin-compatible with other devices in the 2x2 accelerometer family, such as the LIS2DW12, LIS2DH12 and LIS2DE12. An embedded self-test capability enables the user to check the functioning of the sensor in the final application.

Features
  • Supply-voltage range: 1.62V to 3.6V
  • 1.3mgrms noise in low-power mode
  • 0.38μA operating current in active low-power mode
  • 16-bit accelerometer data output
  • 12-bit temperature sensor output
  • Survives 10,000g shock
Applications
  • Fragile shipment tracking
  • Hearing aids
  • Portable healthcare devices
  • Wireless sensor nodes
  • Metering equipment

 

The STEVAL-MKI190V1 is an adapter board designed to facilitate the evaluation of the LIS2DTW12 product family. It supports fast system prototyping and device evaluation directly in the user’s application.

LIS2DTW12: Built-in free-fall, tap, orientation and other detection functions

 

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