MMA7456LT

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Motion sensors such as accelerometers are becoming increasingly important for a variety of applications, ranging from mobile device user interfaces to vehicle stability control systems. The Freescale Semiconductor MMA7456LT (Low Tolerance) is a low-g three-axis linear accelerometer used for sensing motion in two or three dimensions. The MMA7456LT is designed for low-g sensing and survivability up to 10 g.

Application Fields

The range of applications for the MMA7456LT is wide, as the device can be used in a variety of systems requiring three-dimensional acceleration data. These include navigation systems, remote keyless entry, airbag deployment systems, vehicle stability control, gaming systems, robot navigation, g-force measurement, and measuring acceleration in extreme environments. The MMA7456LT\'s low-g sensitivity is specifically suited for motion sensing applications such as security/intrusion detection systems.

Working Principle

The MMA7456LT is a MEMS (micro-electro-mechanical systems) accelerometer, meaning that it is made up of miniature mechanical structures that react when exposed to acceleration. The device senses acceleration in two directions (X and Y axes) and also measures the combined force in the Z-axis direction (representing vertical acceleration).

The MMA7456LT works by detecting a change in relative capacitance due to the acceleration. When exposed to acceleration, the two mechanical structures used to detect movement are moved and this change results in a change in relative capacitance between the two structures. This change in capacitance is detected as a voltage which is then converted into an acceleration value.

The MEMS device is extremely sensitive and is capable of detecting a change in acceleration as small as 0.05 g in the X and Y axes and 0.1 g in the Z axis. This makes it ideal for motion sensing applications that require precise data.

Conclusion

The MMA7456LT is a low-g three-axis linear accelerometer that is well-suited for a variety of motion sensing applications. Its small form factor and low-g sensitivity make it ideal for detecting small changes in acceleration. With its wide range of application possibilities, the MMA7456LT is a valuable addition to any motion sensing system.

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