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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ADXL Datasheet(PDF) – Analog Devices
Although the ADXLE features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges.
T2 does not have to be measured for every measurement cycle. The analog bandwidth may be further decreased to reduce noise and improve resolution. Supply 0 g Offset vs. The offset and sensitivity are nominally: 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. An analog output can be reconstructed by filtering the duty cycle output.
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.
When the accelerometer is perpendicular to gravity, its output will change nearly It need only be updated to account for changes due to temperature, a relatively slow process. Daasheet key points are presented here. Typical Supply Current vs. The equation for the period is: Often the peak value of the noise is desired.
The sensor is a surface micromachined polysilicon structure built on top of the silicon wafer. A proper design will take into account the application requirements for bandwidth, signal resolution and acquisition time, as discussed in the following sections. Specific code sets, reference designs, and application notes are available from the factory.
This technique requires only passive components.
ADXL Data Sheet
Deflection of the structure is measured using a differential capacitor that consists of independent fixed plates and central plates attached to the moving mass. When one sensor is reading a maximum change in output per degree, the other is at its minimum. The microcontroller should have provisions for software calibration. Power Cycling When Using the Digital Output An alternative is to run the microcontroller at a higher clock rate and put it into shutdown between readings, allowing the use of the digital output.
The resulting movement of the beam allows the user to test if the accelerometer is functional. When the accelerometer is oriented on axis to gravity, i. When this pin is set to VDD, an electrostatic force is exerted on the beam of the accelerometer.
The outputs are analog voltage or digital signals whose duty cycles ratio of pulsewidth to period are proportional to acceleration.
These requirements will help to determine the accelerometer bandwidth, the speed of the microcontroller clock and the length of the T2 period. An accelerometer is most sensitive to tilt when its sensitive axis is perpendicular to the force of gravity, i.
The concept is to acquire a reading as quickly as possible and then shut down the ADXLE and the microcontroller until the next sample is needed. The accelerometer can measure static acceleration forces such as gravity, allowing it to be used as a tilt sensor. Decoding algorithms for various microcontrollers have been developed.
A minimum capacitance of pF for C X, Y is required in all cases. This will result in adxp202 dynamic error generated at the DCM. With the single pole roll-off characteristic, the typical noise of the ADXLE is determined by the following equation: This pin may be left open circuit or connected to common in normal use.
ADXL202 Data Sheet
The user must filter the signal at this point to limit aliasing errors. Thomas Jefferson, Dxtasheet of Independence. Documents Flashcards Grammar checker. Output for dstasheet Parts REV. The advantage of this method is an output scale factor of approximately double the analog output. Phase sensitive demodulation techniques are then used to rectify the signal and determine the direction of the acceleration. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
The ADXLE architecture has been designed so that these calibrations take place in the software of the microcontroller used to decode the duty cycle signal. Note that the accelerometer offset and sensitivity are ratiometric to the supply voltage. The easiest way to null this offset is with a calibration factor xdxl202 on the microcontroller or by a user calibration for zero g. Typical X-Axis Zero g vs.
Running the part at 3 V will reduce the supply current from 0.