ADXL212AEZ Analog Devices Inc, ADXL212AEZ Datasheet

ADXL212AEZ

Manufacturer Part Number

ADXL212AEZ

Description

IC ACCELEROMETER DUAL 8LCC

Manufacturer

Analog Devices Inc

Datasheet

1.ADXL212AEZ.pdf (12 pages)

Specifications of ADXL212AEZ

Acceleration Range

Â± 2g

No. Of Axes

Sensor Case Style

LCC

No. Of Pins

Supply Voltage Range

3V To 5.25V

Operating Temperature Range

-40Â°C To +85Â°C

Peak Reflow Compatible (260 C)

Yes

Rohs Compliant

Yes

Leaded Process Compatible

Yes

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

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FEATURES

Dual axis accelerometer on a single IC chip

5 mm × 5 mm × 2 mm LCC package

5 mg resolution at 60 Hz

Low power: 700 μA at V

High zero g bias stability

High sensitivity accuracy

Pulse width modulated digital outputs

X- and Y-axis aligned to within 0.1° (typical)

Bandwidth adjustment with a single capacitor

Single-supply operation

3500 g shock survival

APPLICATIONS

Automotive tilt alarms

Vehicle dynamic control (VDC)/electronic stability program

Electronic chassis control

Electronic braking

Data projectors

Navigation

Platform stabilization/leveling

Alarms and motion detectors

High accuracy, 2-axis tilt sensing

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. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

(ESP) systems

= 5 V (typical)

SENSOR

COM

FUNCTIONAL BLOCK DIAGRAM

ADXL212

AMP

DEMOD

Figure 1.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

GENERAL DESCRIPTION

The ADXL212 is a high precision, low power, complete dual

axis accelerometer with signal conditioned, duty cycle modulated

outputs, all on a single monolithic IC. The ADXL212 measures

acceleration with a full-scale range of ±2 g (typical). The ADXL212

measures both dynamic acceleration (such as vibration) and

static acceleration (such as gravity).

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

width to period) are proportional to acceleration (12.5%/g) in

each of the two sensitive axes. The duty cycle outputs can be

directly measured by a microcontroller without an analog-to-

digital converter (ADC) or glue logic. The output period is

adjustable from 0.5 ms to 10 ms via a single resistor (R

The typical noise floor is 500 μg/√Hz, allowing signals below

5 mg (0.3° of inclination) to be resolved in tilt sensing applica-

tions using narrow bandwidths (<60 Hz).

The user selects the bandwidth of the accelerometer using

Capacitors C

of 0.5 Hz to 500 Hz can be selected to suit the application.

The ADXL212 is available in a 5 mm × 5 mm × 2 mm, 8-lead

hermetic LCC package.

OUTPUT

AMP

PWM OUTPUT WAVEFORM SAMPLE

PWM Output Accelerometer

A(g) = (t1/t2 – 0.5)/12.5%

0g = 50% DUTY CYCLE

t2(sec) = R

32kΩ

FILT

Precision ±2 g Dual Axis,

SET

and C

FILT

/125MΩ

DCM

SET

at the X

OUT

FILT

and Y

FILT

pins. Bandwidths

ADXL212

www.analog.com

SET

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ADXL212AEZ Summary of contents

Page 1

FEATURES Dual axis accelerometer on a single IC chip 5 mm × × LCC package 5 mg resolution Low power: 700 μ (typical) S High zero g bias ...

ADXL212 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 Thermal Resistance ...................................................................... 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. ...

Page 3

SPECIFICATIONS T = –40°C to +85° are guaranteed. Typical specifications are not guaranteed. Table 1. Parameter SENSOR INPUT Measurement Range 1 Nonlinearity Package Alignment Error Alignment Error Cross Axis ...

Page 4

ADXL212 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Acceleration (Any Axis, Unpowered) Acceleration (Any Axis, Powered Output Short-Circuit Duration (Any Pin to Common) Operating Temperature Range Storage Temperature Range Stresses above those listed under Absolute Maximum Ratings may cause ...

Page 5

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 5. Pin Function Descriptions Pin No. Mnemonic COM 4 Y OUT 5 X OUT 6 Y FILT 7 X FILT ADXL212 TOP VIEW (Not to Scale) ...

Page 6

ADXL212 TYPICAL PERFORMANCE CHARACTERISTICS unless otherwise noted DUTY CYCLE OUTPUT (%) Figure 4. X-Axis Zero g Bias Deviation from Ideal at 25° ...

Page 7

TEMPERATURE (°C) Figure 10. Zero g Bias vs. Temperature, Parts Soldered to PCB NOISE ...

Page 8

ADXL212 DELTA IN DUTY CYCLE (%) Figure 16. X-Axis Self Test Response at 25°C 100 ...

Page 9

THEORY OF OPERATION X Y OUT The ADXL212 is a complete dual axis acceleration measure- ment system on a single monolithic IC. It contains a polysilicon surface-micromachined sensor and signal conditioning circuitry to implement an open-loop acceleration measurement archi- tecture. ...

Page 10

ADXL212 APPLICATIONS INFORMATION POWER SUPPLY DECOUPLING For most applications, a single 0.1 μF capacitor, C decouples the accelerometer from noise on the power supply. However, in some cases, particularly where noise is present at the 140 kHz internal clock frequency ...

Page 11

... The output tilt in degrees is calculated as follows: Pitch = ASIN(A Roll = ASIN(A where A Be sure to account for overranges possible for the accelerometers to output a signal greater than ±1 g due to vibration, shock, or other accelerations. Rev Page ...

Page 12

... TOP VIEW R 0.008 (4 PLCS) ORDERING GUIDE Number Specified 1 Model of Axes Voltage (V) ADXL212AEZ 2 5 ADXL212AEZ– EVAL-ADXL212Z RoHS Compliant Part. ©2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 0.087 0.078 0.020 0.069 0.015 ...

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