Class #2 - Overview of Data Acquisition, Sensors and Actuators

Engineering Applications of Correlation and Spectral Analysis, 2nd Edition

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REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a ADXL210E One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2002 Low-Cost ± 10 g Dual-Axis Accelerometer with Duty Cycle FUNCTIONAL BLOCK DIAGRAM ANALOG TO DUTY CYCLE (ADC) C O U N T E R ² P X OUT Y OUT DEMOD DEMOD R FILT 32k ³ R FILT 32k ³ ADXL210E R SET T2 C Y Y FILT SELF-TEST X FILT C X OSCILLATOR COM Y SENSOR X SENSOR 3V TO 5.25V V DD C DC T1 T2 A( g ) = (T1/T2 – 0.5)/4% 0 g = 50% DUTY CYCLE T2 = R SET /125M ³ FEATURES 2-Axis Acceleration Sensor on a Single IC Chip 5 mm ´ 5 mm ´ 2 mm Ultrasmall Chip Scale Package 2m g Resolution at 60 Hz Low Power < 0.6 mA Direct Interface to Low-Cost Microcontrollers via Duty Cycle Output BW Adjustment with a Single Capacitor 3 V to 5.25 V Single-Supply Operation 1000 Shock Survival APPLICATIONS 2-Axis Tilt Sensing with Faster Response than Electrolytic, Mercury, or Thermal Sensors Computer Peripherals Information Appliances Alarms and Motion Detectors Disk Drives Vehicle Security GENERAL DESCRIPTION The ADXL210E is a low-cost, low-power, complete 2-axis acceler- ometer with a digital output, all on a single monolithic IC. It is an improved version of the ADXL210AQC/JQC. The ADXL210E will measure accelerations with a full-scale range of ± 10 g . The ADXL210E can measure both dynamic acceleration (e.g., vibra- tion) and static acceleration (e.g., gravity). The outputs are analog voltage or digital signals whose duty cycles (ratio of pulsewidth to period) are proportional to acceleration. The duty cycle outputs can be directly measured by a micro- processor counter without an A/D converter or glue logic. The duty cycle period is adjustable from 0.5 ms to 10 ms via a single resistor (R SET ). The typical noise floor is 200 ± g Hz , allowing signals below g (at 60 Hz bandwidth) to be resolved. The bandwidth of the accelerometer is set with capacitors C X and C Y at the X FILT and Y FILT pins. An analog output can be recon- structed by filtering the duty cycle output. The ADXL210E is available in a 5 mm ² 5 mm ² 2 mm 8-lead hermetic LCC package.
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REV. 0 –2– ADXL210E–SPECIFICATIONS (T A = T MIN to T MAX , T A = 25 ± C for J Grade only, V DD = 5 V, R SET = 125 k ² , Acceleration = 0 g , unless otherwise noted.) ADXL210JE ADXL210AE Parameter Conditions Min Typ Max Min Typ Max Unit SENSOR INPUT Each Axis Measurement Range 1 ± 8 ± 10 ± 8 ± 10 g Nonlinearity Best Fit Straight Line 0.2 0.2 % of FS Alignment Error 2, 3 ± 1 ± 1 Degrees
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This note was uploaded on 02/04/2008 for the course CEE 619 taught by Professor Lynch during the Winter '06 term at University of Michigan.

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Class #2 - Overview of Data Acquisition, Sensors and Actuators

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