Analog Devices ADXL210E Datasheet

Low-Cost 10 g Dual-Axis

a

FEATURES
2-Axis Acceleration Sensor on a Single IC Chip
5 mm  5 mm  2 mm Ultrasmall Chip Scale Package

g

Resolution at 60 Hz

2m
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

g

Shock Survival

1000

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

Accelerometer with Duty Cycle

ADXL210E

FUNCTIONAL BLOCK DIAGRAM

3V TO 5.25V

V

DD

X SENSOR

DEMOD

C

DC

OSCILLATOR

DEMOD

Y SENSOR

COM

C

X

R

FILT

32k

ADXL210E

R

FILT

32k

X

Y

FILT

FILT

C

Y

ANALOG

TO

DUTY

CYCLE

(ADC)

T1

SELF-TEST

X

OUT

C
O
U
N
T
E
R

Y

OUT

T2

R

SET

T2

A(g) = (T1/T2 – 0.5)/4%
0g = 50% DUTY CYCLE

/125M

T2 = R

SET

P

GENERAL DESCRIPTION

The ADXL210E is a low-cost, low-power, complete 2-axis acceler­ometer 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., vibra­tion) 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 micro­processor 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
2mg (at 60 Hz bandwidth) to be resolved.

The bandwidth of the accelerometer is set with capacitors C
C

at the X

Y

FILT

and Y

pins. An analog output can be recon-

FILT

and

X

structed by filtering the duty cycle output.

The ADXL210E is available in a 5 mm ⫻ 5 mm ⫻ 2 mm 8-lead
hermetic LCC package.

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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]www.analog.com
Fax: [phone] © Analog Devices, Inc., 2002

ADXL210E–SPECIFICATIONS

(TA = T
unless otherwise noted.)

MIN

to T

, TA = 25C for J Grade only, VDD = 5 V, R

MAX

= 125 k, Acceleration = 0 g,

SET

ADXL210JE ADXL210AE

Parameter Conditions Min Typ Max Min Typ Max Unit

SENSOR INPUT Each Axis

Measurement Range
Nonlinearity Best Fit Straight Line 0.2 0.2 % of FS
Alignment Error
Alignment Error X Sensor to Y Sensor 0.01 0.01 Degrees
Cross-Axis Sensitivity

SENSITIVITY Each Axis

Duty Cycle per g
Duty Cycle per g
Sensitivity X
Sensitivity X

FILT

FILT

Temperature Drift

ZERO g BIAS LEVEL Each Axis

0 g Duty Cycle
0 g Duty Cycle
0 g Voltage X
0 g Voltage X
0 g Duty Cycle vs. Supply
0 g Offset vs. Temperature

NOISE PERFORMANCE

Noise Density

2

2

FILT

FILT

2

2, 3

2

2

, Y
, Y

, Y
, Y

FILT

FILT

2, 5

1

2, 4

FILT

FILT

±8 ±10 ±8 ±10 g

±1 ±1 Degrees

±2 ±2%

T1/T2, VDD = 5 V 3.3 4.0 4.9 3.2 4.0 5 %/g

2

2

T1/T2, VDD = 3 V 3.2 3.8 4.4 3.0 3.8 4.6 %/g
VDD = 5 V 85 100 125 80 100 130 mV/g
VDD = 3 V 45 55 65 40 55 70 mV/g
Delta from 25⬚C ±0.5 ±0.5 %

T1/T2, VDD = 5 V 44 50 56 42 50 58 %
T1/T2, VDD = 3 V 40 50 60 38 50 62 %

2

VDD = 5 V 2.3 2.5 2.7 2.3 2.5 2.7 V

2

VDD = 3 V 1.35 1.5 1.65 1.3 1.5 1.7 V

2

2, 5

Delta from 25⬚C 2.0 2.0 mg/⬚C

1.0 4.0 1.0 4.0 %/V

@ 25⬚C 200 200 1000 µg√Hz rms

FREQUENCY RESPONSE

3 dB Bandwidth At Pins X

FILT

, Y

FILT

6 6 kHz

Sensor Resonant Frequency 10 10 kHz

FILTER

R

Tolerance 32 kΩ Nominal ±15 ±15 %

FILT

Minimum Capacitance At Pins X

FILT

, Y

FILT

1000 1000 pF

SELF-TEST

Duty Cycle Change Self-Test “0” to “1” 3 3 %

DUTY CYCLE OUTPUT STAGE

F

SET

Output High Voltage I = 25 µAV

R

= 125 kΩ 0.7 1.3 0.7 1.3 kHz

SET

– 200 mV VS– 200 mV V

S

Output Low Voltage I = 25 µA 200 200 mV
T2 Drift vs. Temperature 50 50 ppm/⬚C
Rise/Fall Time 200 200 ns

POWER SUPPLY

Operating Voltage Range 3 5.25 3.0 5.25 V
Quiescent Supply Current 0.6 1.0 0.6 1.0 mA
Turn-On Time C

in µF 160 ⫻ C

FILT

+ 0.3 160 ⫻ C

FILT

+ 0.3 ms

FILT

TEMPERATURE RANGE

Specified Performance AE –40 +85 ⬚C
Operating Range 0 70 –40 +85 ⬚C

NOTES

1

Guaranteed by measurement of initial offset and sensitivity.

2

See Typical Performance Characteristics.

3

Alignment error is specified as the angle between the true and indicated axis of sensitivity (see TPC 15).

4

Cross-axis sensitivity is the algebraic sum of the alignment and the inherent sensitivity errors.

5

Defined as the output change from ambient to maximum temperature or ambient to minimum temperature.

Specifications subject to change without notice.

–2–

REV. 0

ADXL210E

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS*

Acceleration (Any Axis, Unpowered for 0.5 ms) . . . . . . 1000 g

Acceleration (Any Axis, Powered for 0.5 ms) . . . . . . . . . . 500 g

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6.0 V

+V

S

Output Short Circuit Duration, (Any Pin to Common)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite

Operating Temperature . . . . . . . . . . . . . . . . –55⬚C to +125⬚C

Storage Temperature . . . . . . . . . . . . . . . . . . –65⬚C to +150⬚C

*Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.

Drops onto hard surfaces can cause shocks of greater than 1000 g and exceed the
absolute maximum rating of the device. Care should be exercised in handling to
avoid damage.

PACKAGE CHARACTERISTICS

Package
Weight ␪

JA

␪

JC

Device

8-Lead LCC 120°C/W TBD°C/W <1.0 grams

ORDERING GUIDE

PIN CONFIGURATION

V

DD

8

X

FILT

Y

FILT

OUT

BOTTOM VIEW

7

6

1

ST

2

T2

35

COMX

4

Y

OUT

PIN FUNCTION DESCRIPTIONS

Pin
No. Mnemonic Description

1 ST Self-Test
2 T2 Connect R

SET

3 COM Common
4Y
5X
6Y
7X
8V

OUT

OUT

FILT

FILT

DD

Y-Channel Duty Cycle Output
X-Channel Duty Cycle Output
Y-Channel Filter Pin
X-Channel Filter Pin
3 V to 5.25 V

to Set T2 Period

No. of Specified Temperature Package Package

Model Axes Voltage Range Description Option

ADXL210JE 2 3 V to 5 V 0 to 70⬚C 8-Lead LCC E-8
ADXL210AE* 2 3 V to 5 V –40⬚C to +85⬚C 8-Lead LCC E-8

*Available Soon

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the ADXL210E features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.

REV. 0

–3–

ADXL210E

–Typical Performance Characteristics

*

VDD = 3 V

35

30

25

20

15

PERCENT OF PARTS

10

5

0

1.42 1.601.44

1.46 1.48 1.50 1.52 1.54 1.56 1.58
VOLTS

TPC 1. X-Axis Zero g Bias Distribution at X

35

30

25

20

, VDD = 3 V

FILT

VDD = 5 V

35

30

25

20

15

PERCENT OF PARTS

10

5

0

2.38 2.632.43

2.40 2.60

2.45 2.48 2.50 2.53 2.55 2.58
VOLTS

TPC 4. X-Axis Zero g Bias Distribution at X

35

30

25

20

, VDD = 5 V

FILT

15

PERCENT OF PARTS

10

5

0

1.42

1.40 1.601.44

1.46 1.48 1.50 1.52 1.54 1.56 1.58
VOLTS

TPC 2. Y-Axis Zero g Bias Distribution at Y

35

30

25

20

15

PERCENT OF PARTS

10

5

0

53.3

52.5 60.054.2

55.0 55.8 56.7 57.5 58.3 59.2
mV/g

TPC 3. X-Axis Sensitivity Distribution at X

, VDD = 3 V

FILT

, VDD = 3 V

FILT

15

PERCENT OF PARTS

10

5

0

2.38 2.632.43

2.40 2.60

2.45 2.48 2.50 2.53 2.55 2.58
VOLTS

TPC 5. Y-Axis Zero g Bias Distribution at Y

70

60

50

40

30

PERCENT OF PARTS

20

10

0

100.0

97.5 103.0

105.0 108.0 110.0 113.0
mV/g

TPC 6. X-Axis Sensitivity Distribution at X

, VDD = 5 V

FILT

, VDD = 5 V

FILT

*Data taken from 14,500 parts over 3 lots minimum.

–4–

REV. 0