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ADXL213AEADIN/a9850avaiLow Cost ±1.2g Dual Axis Accelerometer with Duty Cycle Modulated Outputs


ADXL213AE ,Low Cost ±1.2g Dual Axis Accelerometer with Duty Cycle Modulated OutputsGENERAL DESCRIPTION Dual axis accelerometer on a single IC chip The ADXL213 is a low cost, low powe ..
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ADXL213AE
Low Cost ±1.2g Dual Axis Accelerometer with Duty Cycle Modulated Outputs
Low Cost ±1.2 g Dual
Axis Accelerometer

Rev. 0
FEATURES
Dual axis accelerometer on a single IC chip
5 mm × 5 mm × 2 mm LCC package
1 mg resolution at 60 Hz
Low power: 700 µA at VS = 5 V (typical)
High zero g bias stability
High sensitivity accuracy
Pulse width modulated digital outputs
X and Y axes aligned to within 0.1° (typical)
BW adjustment with a single capacitor
Single-supply operation
3500 g shock survival
APPLICATIONS
Automotive tilt alarms
Data projectors
Navigation
Platform stabilization/leveling
Alarms and motion detectors
High accuracy, 2-axis tilt sensing
GENERAL DESCRIPTION

The ADXL213 is a low cost, low power, complete dual axis
accelerometer with signal conditioned, duty cycle modulated
outputs, all on a single monolithic IC. The ADXL213 measures
acceleration with a full-scale range of ±1.2 g (typical). The
ADXL213 can measure both dynamic 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 acceleration (30%/g). The
duty cycle outputs can be directly measured by a microcontrol-
ler without an A/D converter or glue logic.
Innovative design techniques are used to ensure high zero g bias
stability (typically better than 0.25 mg/°C), as well as tight sensi-
tivity stability (typically better than 50 ppm/°C).
The typical noise floor is 160 µg/√Hz, allowing signals below
1 mg (0.06° 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 CX and CY at the XFILT and YFILT pins. Bandwidths of
0.5 Hz to 250 Hz may be selected to suit the application.
The ADXL213 is available in a 5 mm × 5 mm × 2 mm, 8-pad
hermetic LCC package.
FUNCTIONAL BLOCK DIAGRAM

+VSSTXFILT+VS
CDC
YOUT
XOUT
RSET
A(g) = (T1/T2– 0.5)/30%
0g = 50% DUTY CYCLE
T2(s) = RSET/125MΩ
Figure 1.
TABLE OF CONTENTS
Specifications.....................................................................................3
Absolute Maximum Ratings............................................................4
Typical Performance Characteristics.............................................5
Theory of Operation........................................................................8
Performance..................................................................................8
Applications.......................................................................................9
Power Supply Decoupling...........................................................9
Setting the Bandwidth Using CX and CY....................................9
Self Test..........................................................................................9
Design Trade-Offs for Selecting Filter Characteristics:
The Noise/BW Trade-Off........................................................9
Using the ADXL213 with Operating Voltages Other
than 5 V...................................................................................10
Using the ADXL213 as a Dual-Axis Tilt Sensor.....................10
Pin Configurations and Functional Descriptions......................11
Outline Dimensions.......................................................................12
ESD Caution................................................................................12
Ordering Guide..........................................................................12
REVISION HISTORY

Revision 0: Initial Version
SPECIFICATIONS
TA = –40°C to +85°C, VS = 5 V, CX = CY = 0.1 μF, Acceleration = 0 g, unless otherwise noted. All minimum and maximum specifications
are guaranteed. Typical specifications are not guaranteed.
Table 1.

Guaranteed by measurement of initial offset and sensitivity.
2 Sensitivity varies with VS. At VS = 3 V, sensitivity is typically 28%/g. Defined as the output change from ambient-to-maximum temperature or ambient-to-minimum temperature.
4 Actual frequency response controlled by user-supplied external capacitor (CX, CY). Bandwidth = 1/(2 × π × 32 kΩ × C). For CX, CY = 0.002 µF, Bandwidth = 2500 Hz. For CX, CY = 4.7 µF, Bandwidth = 1 Hz. Minimum/maximum values are not tested.
6 Self-test response changes with VS. At VS = 3 V, self-test output is typically 8%. Larger values of CX, CY increase turn-on time. Turn-on time is approximately 160 × CX or CY + 4 ms, where CX, CY are in µF.
ABSOLUTE MAXIMUM RATINGS
Table 2. ADXL213 Stress Ratings

Stresses above those listed under Absolute Maximum Ratings
may cause permanent 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
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Table 3. Package Characteristics

t25°C TO PEAK
CRITICAL ZONE
RATURE
TIME
Figure 2. Recommended Soldering Profile
TYPICAL PERFORMANCE CHARACTERISTICS
(VS = 5 V for all graphs, unless otherwise noted.)
PERCENT OF POPULATION (
5.0

DUTY CYCLE OUTPUT (%)4445464748495051525354555657
Figure 3. X Axis Zero g Bias Deviation from Ideal at 25°C
PER
OF POPU
TION
5.0

TEMPCO (mg/°C)
0.10.20.30.40.50.60.70.80.91.0
Figure 4. X Axis Zero g Bias Tempco
PER
OF POPU
TION
5.0

DUTY CYCLE OUTPUT (% perg)
PER
OF POPU
TION
5.0
DUTY CYCLE OUTPUT (%)4445464748495051525354555657
Figure 6. Y Axis Zero g Bias Deviation from Ideal at 25°C
RCE
NT OF P
LATION (%)
5.0

TEMPCO (mg/°C)
0.10.20.30.40.50.60.70.80.91.0
Figure 7. Y Axis Zero g Bias Tempco
RCE
NT OF P
LATION (%)
5.0

DUTY CYCLE OUTPUT (% perg)
28.028.428.829.229.630.030.430.831.231.632.0
TEMPERATURE (°C)
DUTY
CY
CLE
(%)
–30–20–102030504060708090

Figure 9. Zero g Bias vs. Temperature – Parts Soldered to PCB
PER
OF POPU
TION
5.0

NOISE DENSITY (µg√Hz)
100110120130140160150190180170200210220240230250
Figure 10. X Axis Noise Density at 25°C
PERCENT SENSITIVITY (%)
PER
OF POPU
TION
1.02.03.04.05.0

Figure 11. Z vs. X Cross-Axis Sensitivity
TEMPERATURE (°C)
SEN
SITIVITY (
–30–20–102030504060708090

Figure 12. Sensitivity vs. Temperature – Parts Soldered to PCB
PER
OF POPU
TION
5.0

NOISE DENSITY (µg√Hz)
100110120130140160150190180170200210220240230250
Figure 13. Y Axis Noise Density at 25°C
PERCENT SENSITIVITY (%)
PER
OF POPU
TION
1.02.03.04.05.0

Figure 14. Z vs. Y Cross-Axis Sensitivity
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