MMA7331LCT

Series:	--
Packaging:	Cut Tape (CT)
Part Status:	Obsolete
Type:	Analog
Axis:	X, Y, Z
Acceleration Range:	±4g, 9g
Sensitivity (LSB/g):	--
Sensitivity (mV/g):	308 (±4g) ~ 83.6 (±9g)
Bandwidth:	400Hz (X,Y), 300Hz (Z)
Output Type:	Analog Voltage
Voltage - Supply:	2.2 V ~ 3.6 V
Features:	Selectable Scale
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	14-TFLGA
Supplier Device Package:	14-LGA (3x5)

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Motion Sensors - Accelerometers Accelerometers are widely used as motion sensors in a variety of applications. Specifically, accelerometers measure the acceleration of objects moving in a given direction. The acceleration measurement can be used to determine the speed, velocity, distance, or heading of an object, and to detect motion or presence of objects.One such accelerometer device is the MMA7331LCT. This three-axis accelerometer has a low-cost package that makes it ideal for a variety of applications. The MMA7331LCT is a critical sensor in a number of motion sensing and motion initiated applications.Operating PrincipleThe MMA7331LCT accelerometer operates according to the “Capacitive Balance Method” of accelerometer operation. In the capacitive balance method, two capacitors are oppositely charged and are connected to the sensing elements. When the accelerometer is moved, the capacitance of the inertial measurement unit (IMU) changes and the voltage across the two capacitors changes sign, indicating acceleration. The design of the capacitor and the way they are connected, determines the particular features of the accelerometer.ApplicationsThe MMA7331LCT is well suited for a variety of applications. Most notably, it is the ideal sensor for pedestrian navigation systems as it is sensitive enough to detect the acceleration of a walking person, yet the device is energy efficient with a power consumption of just 10 mW. Not only that, the device includes a built-in low-noise amplifier for high sensitivity.The device can also be employed for intelligent industrial applications, where it can detect the acceleration and angular velocity of machinery following predetermined acceleration profiles, allowing for process control as well as fault detection.In addition, the MMA7331LCT accelerometer can be used in home automation systems to detect motion, such as opening doors or windows.ConclusionThe MMA7331LCT accelerometer is an excellent choice for motion sensing applications requiring low-cost, energy efficient design. Its sensitivity and low-noise amplifier make it ideal for navigation and pedestrian applications, as well as industrial applications and home automation systems. The accelerometer operates according to the capacitive balance method, which makes it ideal for applications where accuracy is important.

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