Nokia Corporation

Vti Technologies Oy

Murata Electronics Oy

Teemu Salo

Kimmo Koli

Juha Rakkola

Risto Mourujärvi

Tuomo Lehtonen

Jukka Salminen

Jens Thurau

The invention relates to measurement devices used in the measurement of acceleration, and more specifically, to micromechanical acceleration sensors. The invention seeks to offer an improved method for the measurement of acceleration directed to three or two dimensions using a micromechanical acceleration sensor as well as an improved micromechanical acceleration sensor. Using this invention, the functional reliability of a sensor can be monitored in constant use, and it is suitable for use particularly in small-sized micromechanical acceleration sensor solutions measuring in relation to several axes.

Method for the mircomechanical measurement of acceleration and a micromechanical acceleration sensor

An energy-efficient acceleration measurement system is presented. The system includes an accelerometer, responsive to acceleration of the system, for providing an accelerometer output signal having a magnitude indicative of at least one component of the acceleration. A motion detector is responsive to the accelerometer output signal, and provides a processor interrupt signal, but only if the magnitude of acceleration reaches a threshold. The processor, responsive to the processor interrupt signal, measures the acceleration with higher accuracy than the motion detector is capable of, but in a way that consumes more power than was needed by the motion detector.

Low power motion detector

Growing community of inventors

Klaukkala, Finland

Teemu Salo