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Digital gyroscope claims high noise immunity

Posted: 26 Aug 2011     Print Version  Bookmark and Share

Keywords:gyroscope  sensing  motion sensor  mems 

STMicroelectronics unveils the L3GD20, a high-performance three-axis digital-output gyroscope that combines high sensing resolution with immunity to audio noise and vibrations, making motion-sensing user interfaces more realistic in mobile phones, tablets, game consoles, and other smart consumer devices.

With a resonant frequency above the audio bandwidth, ST's digital gyroscope operates with greater accuracy and reliability, because it is immune to both mechanical vibrations coupled through the printed circuit board and to audio noise, such as from speakers mounted close to the sensor. Furthermore, its design, with a single sensing structure for motion measurement along all three orthogonal axes, further increases sensing accuracy and reliability and promises excellent output stability over time and temperature.

Housed in a 4x4x1mm package, the L3GD20 gyroscope offers a wide set of user-programmable full-scale ranges from ±250–±2000dps, with the low full-scale values for high accuracy of slow-motion sensing and the high range to detect and measure fast gestures and movements. The device provides a 16bit data output, together with additional embedded digital features, such as configurable low- and high-pass filters.

Addressing power constraints in battery-operated portable devices, ST's new gyroscope includes power-down and sleep modes and an embedded FIFO (first-in first-out) memory block for smarter power management. It can operate with any supply voltage over the range of 2.4–3.6V.

In addition to enabling intuitive man-machine interfaces in portable devices, ST's gyroscopes are used for dead-reckoning and/or map-matching in enhanced navigation applications and for compensating digital video or still camera shaking for sharper shots.

The new gyroscope is pin-to-pin adaptable and software-compatible with the current-generation device, the L3G4200D, so customers can easily 'hot swap' and protect their investment in application development.

The device is sampling now and volume production is scheduled for Q4 2011, with unit pricing at Rs.132.29 ($2.95) for volumes in the range of 1,000 pieces.

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