ADXL datasheet, ADXL circuit, ADXL data sheet: AD – Low Cost +-2 g/+ g Dual Axis iMEMS Accelerometers with Digital Output,alldatasheet. ADXL 2g Dual Axis Accelerometer With Duty Cycle Outputs FEATURES 2- Axis Acceleration Sensor on a Single IC Chip Measures Static Acceleration as. ADXL Accelerometers are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for ADXL Accelerometers.
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This pin may be left open circuit or connected to common in normal use. It is recommended that the user limit bandwidth to the lowest frequency needed by the application, to maximize the resolution and dynamic range of the accelerometer. Typical Y-Axis Zero g vs. Typical X-Axis Zero g vs. ST The ST pin controls the self-test feature. The device is designed to operate at duty cycle periods between 0.
The sensor is a surface micromachined polysilicon structure built on top of the silicon wafer. Capacitors must be added at these pins to implement low-pass filtering for antialiasing and noise reduction. The actual resolution of the acceleration signal is, however, limited by the time resolution of the counting devices used to decode the duty cycle.
With the single pole roll-off characteristic, the typical noise of the ADXLE is determined daxl202 the following equation: For low g applications, the force of gravity is the most stable, accurate and convenient acceleration reference available. When the accelerometer is oriented on axis to gravity, i. One Technology Way, P.
Consult the appropriate Application Note. T2 Length of the total cycle.
The equation for the period is: Application adlx202 outlining algorithms for calculating acceleration from duty cycle and automated calibration routines are available from the factory. When the accelerometer is perpendicular to gravity, its output will change nearly Thomas Jefferson, Declaration datasheef Independence.
The equation for the 3 dB bandwidth is: Specific code sets, reference designs, and application notes are available from the factory. Supply 0 g Offset vs. T2 does not have to be measured for every measurement cycle. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Polysilicon springs suspend the structure over the surface of the wafer and provide a resistance against acceleration forces.
Datashet III is useful for estimating the probabilities of exceeding various peak values, given the rms value.
ADXL Datasheet pdf – ±2 g Dual Axis Accelerometer – Analog Devices
Peak-to-peak noise can only be estimated by statistical methods. This is a stress rating only; functional operation of the device at these or any other conditions above those indicate in the opera tional sections of this specification is not implied. The offset and sensitivity are nominally: The duty cycle period is adjustable from 0. In either of the above approaches, the ADXLE can be turned on and off directly using a digital port pin on the microcontroller to power the accelerometer without additional components.
This section will outline a general design procedure and discuss the various trade-offs that need to be considered. The microcontroller should have provisions for software calibration.
ADXL202 Data Sheet
The designer should have some idea of the required performance of the system in terms of: An accelerometer is most sensitive to tilt when its sensitive axis is perpendicular to the force of gravity, i. Note that the accelerometer offset and sensitivity are ratiometric to the supply voltage.
Estimation of Peak-to-Peak Noise When selecting a microcontroller it is helpful to have a counter timer port available. Its higher sensitivity An op amp follower may be required to buffer this pin. A single resistor sets the period for a complete cycle T2which can be set between 0.
The sensitivity can be determined by the two measurements. Deflection of the structure is measured using a differential capacitor that adx,202 of independent fixed plates and central plates attached to the moving mass. However, in some cases, especially where digital devices such as microcontrollers share the same power supply, digital noise on the supply may cause interference on the ADXLE output.
An accelerometer uses the force of gravity as an input vector to determine orientation of an object in space. The easiest way to null this offset is with a calibration factor saved on the microcontroller or by a user adxl2002 for zero g.
Care should be exercised in handling to avoid damage. These requirements will help to determine the accelerometer bandwidth, the speed of the microcontroller clock and the length of the T2 period. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
At this orientation its sensitivity to dwtasheet in tilt is highest. Phase sensitive demodulation techniques are then used to rectify the signal and determine the direction of the acceleration. It contains a polysilicon surfacemicromachined sensor and signal conditioning circuitry to implement an open loop acceleration measurement architecture. The accelerometer can measure static acceleration forces such as gravity, allowing it to be used as a tilt sensor.