For many current applications, such as free-fall detection, screen rotation or pedometers, a single MEMS accelerometer meets the system requirements. However, a new class of advanced applications is emerging, for example: location-based services, enhanced motion-based gaming, pedestrian dead-reckoning for indoor and multi-floor navigation, robotics or human-body tracking.
These applications require multiple MEMS sensors, together with advanced software, to achieve better overall system performance in terms of accuracy, resolution, stability and response time. The software can correct for magnetic distortions registered on the magnetometer, dynamic distortion measured by the accelerometer, and inherent drift over time of the gyroscope. This protects the accuracy of heading information, removes pointing inaccuracies and drift problems, and virtually eliminates timeouts for calibration.
The iNEMO engine is a two-chip sensor solution (LSM303DLHx e-compass and the L3G4200D gyroscope)
More information on ST’s MEMS solutions at www.st.com/mems
Visit STMicroelectronics at www.st.com