MMA2702W

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Motion sensors are devices that measure the movement of objects and are often divided into three categories: accelerometers, gyroscopes, and tilt sensors. The MMA2702W is specifically an accelerometer, and is used to measure static and dynamic acceleration in three axes.

What is an MMA2702W Accelerometer?

The MMA2702W is an electro-thermally isolated capacitive (micromachined) accelerometer. It is a 3-axis accelerometer which has a MEMS (micro-electromechanical system) silicon chip structure and a top-mounted sealed package. It is very small and lightweight, measuring 11 mm x 11 mm x 5.5 mm and weighing just 0.6 grams. This accelerometer is typically used in automotive, consumer, and industrial applications that require accurate, miniaturized motion sensing.

Features of the MMA2702W Accelerometer

The MMA2702W has a wide frequency range of up to 500 Hz, providing high accuracy and resolution in motion sensing. Built-in temperature compensation ensures that readings are reliable and consistent, even in environments that have temperature fluctuations. Its design also minimizes power consumption, allowing the device to run on a low voltage power supply, and offers maximum protection from external vibrations. Other features of this accelerometer include a wide dynamic range, low noise, and a fast stabilization time.

Applications of the MMA2702W Accelerometer

The MMA2702W accelerometer is suitable for demanding motion sensing applications such as automotive vibration monitoring, consumer and industrial equipment when measuring acceleration and angular motion. It can also be used for tilt measurement when detecting the orientation of a device. The accelerometer can be used in medical and sports equipment when evaluating linear and angular acceleration of the human body, such as analyzing gait, posture, and step size. It is also used in physical security applications when detecting vibrations caused by intruders.

Working Principle of the MMA2702W Accelerometer

The working principle of the MMA2702W accelerometer is based on the detection of change in the mechanical acceleration by the deflection of a micro-electromechanical system (MEMS) structure which is placed on small suspended cantilever beams. The displacement of the beam generates a force which causes a capacitance change, and the acceleration is then determined by measuring the capacitance changes over time. This accelerometer uses electro-thermally isolated structures to detect minute movements, allowing it to measure acceleration as low as 0.15 m/s².

Conclusion

The MMA2702W is an advanced, accurate, and reliable 3-axis accelerometer that is suitable for a wide range of applications. Its small size, low power consumption, and wide frequency range make it an ideal choice for automotive, consumer, and industrial motion sensing applications. By measuring the displacement of the MEMS structure and converting it to a capacitance change, the accelerometer is able to accurately measure static and dynamic acceleration in three axes.

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