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MEMS device suits tiny motion-sensing apps

Posted: 12 Mar 2007 ?? ?Print Version ?Bookmark and Share

Keywords:sensor? accelerometer? MEMS? ST? motion sensor?

Ultracompact linear accelerometer from ST

STMicroelectronics has added a power- and cost-optimized solution to its family of ultracompact low-g linear accelerometers. The tiny, low-power MEMS device provides precise acceleration values in all three dimensions, meeting the growing demand for miniature motion-sensing solutions in portable electronic devices.

Shock resistant
The analog-output LIS302ALK provides individual acceleration values for all three (x, y, z) axes. The sensor is housed in a 5-by-3-by-0.9mm plastic package to fit in a variety of space-constrained applications and its ultracompact robust design provides shock survivability up to 10,000g in 0.1ms.

The sensor offers a full-scale output range of 2g and it is suitable for low-frequency vibration monitoring at very low power consumption. It incorporates a power-down mode to reach 1?A supply current and built-in self-test capability that allows the customer to verify the functioning of the sensor after it has been assembled on board.

ST's family of LIS302 MEMS motion sensors delivers flexibility in terms of output signals and sensitivity, addressing different system needs and hardware characteristics in a wide range of low-g applications. Areas of use include free-fall detection for data-integrity protection in HDDs, vibration monitoring and compensation, damage prevention, remote control as well as motion user interfaces in mobile and gaming devices.

Power management
The LIS302 family of motion sensors can also be used to manage power consumption of products that need to be powered on (or off) while or after they have been touched or moved. For example, motion sensors can activate a remote control when someone picks it up, controlling the overall power consumption of the circuitry. In medical applications, the sensors can be used to monitor motion or detect the position/activity level of patients.

The LIS302ALK uses ST's ECOPACK Pb-free technology for RoHS-compliance. Sample and production quantities of the LIS302ALK are available today. Unit pricing is $2.95 for quantities of 30,000 pieces.

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