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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Care should be exercised in handling to avoid damage. 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.
ADXL Datasheet and Product Info | Analog Devices
Duty Cycle Filtering An analog output can be reconstructed by filtering the duty cycle output. Peak-to-peak noise can only be estimated by statistical methods.
The analog bandwidth may be further decreased to reduce noise and improve resolution. Typical Supply Current vs. Phase sensitive demodulation techniques are then used to rectify the signal and determine the direction of the acceleration.
When one sensor is reading ratasheet maximum change in output per degree, the other is at its minimum.
No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. The advantage of this method is an output scale factor of approximately double the analog output. This filtering improves measurement resolution and helps prevent aliasing. A Information furnished by Analog Devices is believed to be accurate and reliable.
Table III is useful for estimating the probabilities of exceeding various peak values, given the rms value.
Running the part at 3 V will reduce the supply current from 0. These requirements will help to determine the accelerometer bandwidth, the speed of datasheeet microcontroller clock and the length of the T2 period. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. It contains a polysilicon surfacemicromachined sensor and signal conditioning circuitry to implement an open loop acceleration measurement architecture.
ADXL202 Data Sheet
The sensitivity can be determined by the two measurements. The device is designed to operate at duty cycle periods between 0. Power Cycle the accelerometer. Decoding algorithms for various microcontrollers have been developed. When the accelerometer is perpendicular to gravity, its output will change nearly The actual resolution of the acceleration signal is, however, limited by the time resolution of the counting devices used to decode the duty cycle. The following table shows some of the trade-offs.
Often the peak value of the noise is desired. Typical X-Axis Zero g vs. The advantage of this method is that the full 5 kHz bandwidth of the accelerometer is available to the user. Its higher sensitivity A buffer amplifier is recommended, and may be required in any case to amplify the analog output to give enough resolution with an 8-bit to bit converter.
BoxNorwood, MAU. 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. Consult the appropriate Application Note. At this orientation its sensitivity to changes in tilt is highest.
Typical Y-Axis Zero g vs. The user must filter the signal at this point to adxxl202 aliasing errors. Using the two readings, the sensitivity is: Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
A single resistor sets the period for a complete cycle T2which can be set between 0. An acceleration will deflect the beam and unbalance the differential capacitor, resulting in an output square wave whose amplitude is proportional to acceleration.
T2 does not have to be measured for every measurement cycle. Outline of the Declaration of Independence. The faster the counter clock, datasheey higher the resolution of the duty cycle and the shorter the T2 period can be for a given resolution. Electrostatic charges as high as V readily accumulate dahasheet the human body and test equipment and can discharge without detection. The analog output signal will be ratiometric to the supply voltage.
A minimum capacitance of pF for C X, Y is required in all cases.
The sensor is a surface micromachined polysilicon structure built on top of the silicon wafer. The accelerometer can measure static acceleration forces such as gravity, allowing it to be used as a tilt sensor. It need only be updated to account for changes due to temperature, a relatively slow process.
The outputs are analog voltage or digital signals whose duty cycles ratio of pulsewidth to period are proportional to acceleration. When this pin is set to VDD, an electrostatic force is exerted on the beam of the accelerometer. Power Cycling When Using the Digital Output An alternative is to run the microcontroller at a higher clock rate dxtasheet put it into shutdown between readings, allowing the use of the digital output.