AD22281

Bandwidth:	400Hz
Base Part Number:	AD22281
Supplier Device Package:	8-LCC (5x5)
Package / Case:	8-CLCC
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 105°C (TA)
Features:	--
Voltage - Supply:	4.75 V ~ 5.25 V
Output Type:	Analog Voltage
Series:	iMEMS®
Sensitivity (mV/g):	27
Sensitivity (LSB/g):	--
Acceleration Range:	±70g
Axis:	X
Type:	Analog
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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AD22281 Application Field and Working Principle

AD22281 is a Motion Sensor – Accelerometer in its product line designed and manufactured by Analog Devices Inc. It is a linear variable capacitance-based accelerometer for inclination and tilt measurement. It measures the acceleration forces in two axes of the force produced by a set of variable capacitance plates. This accelerometer is designed to be used in a wide range of applications that require tilt and inclination measurement such as remote monitoring of objects that are in motion. It can be used in monitoring the posture of wheelchair users, or for the determination of roof inclines for structure or construction monitoring.The AD22281 accelerometer has a wide range operational temperature from -40°C to +85°C and its output is stable over the temperature range. It is a very low-power device with sleep and awake modes that give it an average current consumption of 10µA in the sleep mode and 250 µA in the awake mode. Consequently, it has a longer run-time with no need for frequent charging or change of batteries. AD22281 employs a variable capacitance principle for its accelerometer measurement. It consists of two sets of capacitance plates. Each plate has variable capacitance which is inversely proportional to its acceleration. This variable capacitance is then measured with an ADC(Analog to Digital Converter). The measured values are then processed to give the acceleration and tilt angles.The accelerometer measures the forces from the acceleration in two axes. The Y-axis measures along the direction of the gravity vector which helps in angle measurement, and in achieving up to 30-degrees of measurement. The X-axis on the other hand measures the lateral force which helps in achieving up to 10g of linear acceleration. This information from the accelerometer is then transferred to the outlet device for further processing. When paired with the real time clock on the Evkit (evaluation board) it can be used to measure real-time acceleration and angles in order to track the movements of the object. This information can be helpful in the remote monitoring of objects and can help in examining the structure of the environment.AD22281 also has adjustable output sensitivity which gives flexibility in the way the accelerometer can store the information. This helps in self-calibrating the device and can be very helpful in various applications. Furthermore, the accelerometer can be easily accessed through the SPI interface which simplifies its use even further.In conclusion, the AD22281 accelerometer by Analog Devices Inc. is a reliable device for inclination and tilt measurement in a variety of applications. It has a wide range operational temperature, low-power consumption, adjustable output sensitivity, and can be accessed through SPI interface. It gives useful information about the environment which can be used for remote monitoring and assessment of structures. The device is reliable and has versatile applications.

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