MMA3204EG

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Motion sensors are an essential type of sensors used in many applications in industries and consumer products. These sensors detect motion in one or more directions, allowing for a wide range of functions and providing feedback to a system to control position, to sense an event, or to record a motion trace. One type of motion sensor is an accelerometer, such as the MMA3204EG.

The MMA3204EG is a 3-axis, digital, low power, high performance accelerometer with an operating temperature range from -40°C to +85°C. It has a package size ofmerely 5.1 x 4.1 x 0.9mm and a maximum power consumption of 75µA. It is capable of reading dynamic accelerations up to +-8g for each of its three axes. The sensitivity can be digitally adjusted to accommodate different applications.

The main application field of the MMA3204EG is in mobile phones, as it is used to detect the orientation of the device, preventing unwanted operation when the phone is in your pocket, for example. Additionally, the MMA3204EG is used in other applications, such as gaming devices, wearables, robotics, and navigation systems.

The working principle of the MMA3204EG is based on measuring the static acceleration of gravity. This acceleration is measured on three perpendicular axes. Each axis is sensitive to static acceleration in its own direction but also receives a signal from the other two axes. An individual signal has to be amplified and filtered to capture only the signal from each respective axis without interference from the other two axes.

The sensing element used in the MMA3204EG is a MEMS (Micro Electromechanical System) cantilever beam. This mechanism is a mechanical system with a low profile construction that takes advantage of the physics laws, such as Bernoulli’s principle, to create a low power and high-sensitivity acceleration measurement. The MEMS cantilever beam is covered with a proof mass, achieving a decrease in capacitance between the proof mass and the beams, thus reducing the power consumption.

The electrical output transmitted by the MMA3204EG is an analog voltage proportional to the acceleration that triggered the signal. This analog signal is passed through a band-pass filter, amplifying the signal and reducing the noise. That noise reduction takes place in three stages: a first-order low-pass filter, a second-order high-pass filter, and a DC offset for any zero-crossing signal. The amplified analog signal is then converted to a digital signal for further processing using12-bit ADCs.

The digital output can either be read as raw data (XZY) or as delta angle data (α, β, γ). This output data is then used in the application to control the desired action or output. For example, in gaming devices, the orientation of the device isused to control the character movements on the screen.

The MMA3204EG is a highly integrated and efficient accelerometer, providing the end user with the convenience of a very simple device, but with a great degree of flexibility. Its low power consumption, small size, and wide temperature rangemake it the ideal choice for a wide range of motion sensing applications.

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