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ADXL202E Datasheet(Arkusz danych) 1 Page - Analog Devices

Numer części ADXL202E
Szczegółowy opis  Low-Cost -2 g Dual-Axis Accelerometer with Duty Cycle Output
Pobierz  12 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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REV. A
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
ADXL202E*
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000
Low-Cost
2
g Dual-Axis Accelerometer
with Duty Cycle Output
FUNCTIONAL BLOCK DIAGRAM
ANALOG
TO
DUTY
CYCLE
(ADC)
C
O
U
N
T
E
R
P
XOUT
YOUT
DEMOD
DEMOD
RFILT
32k
RFILT
32k
ADXL202E
RSET
T2
CY
YFILT
SELF-TEST
XFILT
CX
OSCILLATOR
COM
Y SENSOR
X SENSOR
3V TO 5.25V
VDD
CDC
T1
T2
A(g) = (T1/T2 – 0.5)/12.5%
0g = 50% DUTY CYCLE
T2 = RSET/125M
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
g 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 ADXL202E 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 ADXL202AQC/JQC. The ADXL202E
will measure accelerations with a full-scale range of
2 g. The
ADXL202E 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 (RSET).
*Patents Pending
The typical noise floor is 200 g
√Hz, allowing signals below
2mg (at 60 Hz bandwidth) to be resolved.
The bandwidth of the accelerometer is set with capacitors CX and
CY at the XFILT and YFILT pins. An analog output can be recon-
structed by filtering the duty cycle output.
The ADXL202E is available in 5 mm
5 mm
2 mm 8-lead
hermetic LCC package.




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