REV. B

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

Low Cost

2

g/ 10 g Dual Axis

iMEMS

with Digital Output

ADXL202/ADXL210

FEATURES

2-Axis Acceleration Sensor on a Single IC Chip

Measures Static Acceleration as Well as Dynamic

Acceleration

Duty Cycle Output with User Adjustable Period

Low Power <0.6 mA

Faster Response than Electrolytic, Mercury or Thermal

Tilt Sensors

Bandwidth Adjustment with a Single Capacitor Per Axis

5 m

g Resolution at 60 Hz Bandwidth

+3 V to +5.25 V Single Supply Operation

1000

g Shock Survival

APPLICATIONS

2-Axis Tilt Sensing

Computer Peripherals

Inertial Navigation

Seismic Monitoring

Vehicle Security Systems

Battery Powered Motion Sensing

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., 1999

FUNCTIONAL BLOCK DIAGRAM

DEMOD

32k

32k

OSCILLATOR

X SENSOR

Y SENSOR

ADXL202/

ADXL210

X OUT

Y OUT

SELF TEST

+3.0V TO +5.25V

COM

T2

C

O

U

N

T

E

R

P

T2

T1

A(

g) = (T1/T2 – 0.5)/12.5%

0

g = 50% DUTY CYCLE

DEMOD

DUTY

CYCLE

MODULATOR

(DCM)

GENERAL DESCRIPTION

The ADXL202/ADXL210 are low cost, low power, complete

2-axis accelerometers with a measurement range of either

±2 g/±10 g. The ADXL202/ADXL210 can measure both dy-

namic acceleration (e.g., vibration) and static acceleration (e.g.,

gravity).

The outputs are digital signals whose duty cycles (ratio of pulse-

width to period) are proportional to the acceleration in each of

the 2 sensitive axes. These outputs may be measured directly

with a microprocessor counter, requiring no A/D converter or

glue logic. The output period is adjustable from 0.5 ms to 10 ms

voltage output proportional to acceleration is available from the

duty cycle outputs.

The bandwidth of the ADXL202/ADXL210 may be set from

floor is 500

µg/√Hz allowing signals below 5 mg to be resolved

for bandwidths below 60 Hz.

The ADXL202/ADXL210 is available in a hermetic 14-lead

Surface Mount CERPAK, specified over the 0

°C to +70°C

commercial or –40

°C to +85°C industrial temperature range.