Data Sheet
MXD202
Page 1 of 8
MXD202 (DIGITAL)
Low Cost, 2.0g, Dual Axis Accelerometer
with Digital Outputs
General Description
The MXD202 is a very low cost dual-axis acceleration sensor on a monolithic IC. With no moving parts,
the device is extremely reliable and is manufactured on a submicron CMOS process enabling small
geometries and small die size, resulting in low overall cost and high functionality. The MXD202 is pri-
marily designed for applications requiring high performance and where overall system cost is a driving
factor in component selection. The MXD202 measures acceleration with a full-scale range of up to ±
2.0g and produces a PWM digital signal output. Sensor is shipped with a duty cycle period of 10 milli-
Seconds (100 Hz). Special order sensors are available with a duty cycle period of 2.5 milli-Seconds
(400 Hz). Typical noise floor is .01% Duty Cycle√Hz, allowing signals below 1.0 milli-g to be resolved.
Frequency response extends to 40 Hz. The frequency response can be extended to 160 Hz with the
implementation of a simple external circuit.
The MXD202 is a dc accelerometer with the capability to measure both ac acceleration, (typ-
ical of vibration) or dc accelerations, (such as inertial force or constant, gravity-induced accelerations).
The MXD202 offers digital output signals which duty cycles (ratio of pulse width to period)
are proportional to the acceleration in each of the axes of sensitivity. The outputs can be measured
directly with a microprocessor counter, eliminating the need for A/D converter or glue logic. The output
duty cycle is programmable over a wide range of sensitivity. MXD202 offers a calibrated temperature
sensor output with a positive temperature coefficient of 5.0 mV/°C. This device can be temperature
compensated easily. The change in sensitivity over the temperature range –40°C to 125°C is pre-
dictable and follows the physical gas laws. The following equation can be used to predict the sensitivi-
ty at any given temperature:
SIN X (TIN)2.67 = SFIN X (TFIN)2.67
(Temperature in °K) See Application Note
(AN-00MX-001).
The MXD202 is available in a metal can (TO-100) or a surface mount (LCC); both are her-
metic and are specified over the temperature range -40°C to 125°C.
Features
• Dual axis acceleration outputs
• Digital outputs
• 1.0
mg
Resolution in 1Hz bandwidth
• 40 Hz Bandwidth expandable to 160 Hz
• Quiescent Supply Voltage: 3.5 mA
• 0g output 50% duty cycle
• 50,000g shock survival
• 2.70V to 5.25V Single Supply
• On-chip mixed signal processing
• Continuous sensors self test
• Temperature sensor output (Tout) 5mV/°K
• Packaged in 8 pin LCC SMD or
10 pin TO-100 THRU-HOLE
• Hermetically sealed packaging
• Reference voltage (V
REF
) 2.50V
Applications
• Automotive -
Vehicle Security/Active Suspension/ABS/HED Angle Control
• Security -
Gas Line/Elevator/Fatigue Sensing
• Office Automation Equipment -
Computer Peripherals/Disk Drives/PDA’s/Mouse
Smart Pens/Cell Phones/Printer Head Acceleration Sensor
• Gaming -
Joystick/RF Interface/Menu Selection
• White Goods -
Spin Control/Cooktop Vibration
Block Diagram of MX20XX
Information furnished by MEMSIC is believed to be
accurate and reliable. However, no responsibility is
assumed by MEMSIC for its use, nor for any infringe-
ments of patents or other rights of third parties which
may result from its use. No license is granted by
implications or otherwise under any patent or patent
rights of MEMSIC.
Technical information.
Subject to change without notice.
MXD202 DIGITAL Data Sheet K 8/1/01
®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: 978.623.8188 • Fax: 978.623.9945
www.memsic.com
Data Sheet
MXD202
Page 2 of 8
MXD202 SPECIFICATIONS
Digital Electrical Characteristics
Measurements @ 25°C Acceleration = 0g unless otherwise noted
V
DD
, V
DA
= 5.0V unless otherwise specified
Parameter
SENSOR
Measurement Range
1
Nonlinearity
Alignment Error
2
SENSITIVITY
Output in Duty Cycle per g
Temperature Changes
8
Cross-Axis Sensitivity
3
ZERO g BIAS LEVEL
0g Offset vs.
Temperature
4
NOISE PERFORMANCE
Noise Density
5
% Duty Cycle
FREQUENCY RESPONSE
3 dB Bandwidth
3 dB Bandwidth
7
Tout Voltage
Temp sensor sensitivity
V REFERENCE
9
SELF TEST
Voltage Delta at outputs
@5V Supply
@2.7V Supply
X, Y OUTPUTS
Rise/Fall Time
POWER SUPPLY
Operating Voltage Range
Specified Performance
Quiescent Supply Current @ 5V
Quiescent Supply Current @ 2.7V
Turn-On Time
6
TEMPERATURE RANGE
Operating Range
Conditions
Each axis
MEMSIC MXD202
Min Typ Max
+/- 2.0
Units
NOTES
1
Guarantee by measurements of initial offset
and sensitivity.
2
Best Fit Straight
Line
Each axis
2
+/- 1.0
10
+/- 2.5
g
% of FS
degrees
% Duty Cycle
/g
Alignment error is specified as the angle between
the true and indicated axis of sensitivity.
Cross-axis sensitivity is the algebraic sum of the
alignment and the inherent sensitivity errors.
Specification refers to the maximum change in
parameter from its initial value at 25°C to its
worst case value at Tmin to Tmax of the specified
temperature range.
Noise density (% Duty Cycle√/Hz) is the average
noise at any frequency in the bandwidth of the device.
The voltage is required to ramp full scale before
making a measurement.
3
4
Delta from 25°C per formula
S
IN
X (T
IN
)
2.67
= S
FIN
X (T
FIN
)
2.67
X sensor to Y sensor
Each axis
48
+/- 2
50
2.0
52
%
% Duty Cycle
mg/°C
5
6
7
Note: Frequency compensating circuit will achieve
160 Hz operations.
Defined as the output change from ambient to
maximum temperature or minimum. Output change
expressed in % change of duty cycle.
For more details refer to
Application Note (AN-00MX-001).
All min and max specifications are subject to change
without notification.
@ +25°C
0.010
0.011 % Duty Cycle
/√Hz
8
40
160
25°C
25°C
Continuous,
Output rails with
failure
Digital signal of100Hz
90
100
110
1.23
2.4
1.25
2.5
1.27
5
2.6
Hz
Hz
V
mV/°K
V
9
5.0
2.7
V
V
nsec
2.7
3.0
4.0
200
-40
5.25
3.5
4.5
400
125
V
mA
mA
ms
°C
Information furnished by MEMSIC is believed to be
accurate and reliable. However, no responsibility is
assumed by MEMSIC for its use, nor for any infringe-
ments of patents or other rights of third parties which
may result from its use. No license is granted by
implications or otherwise under any patent or patent
rights of MEMSIC.
Technical information.
Subject to change without notice.
MXD202 DIGITAL Data Sheet K 8/1/01
®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: 978.623.8188 • Fax: 978.623.9945
www.memsic.com
Data Sheet
MXD202
Page 3 of 8
ABSOLUTE MAXIMUM RATINGS*
Symbol
VDD
TSTG
Parameter
Supply Voltage to Ground Potential
Storage Temperature
Acceleration
Rating
-0.5 to 7.0
-65 to +150
50,000
Units
Volts
Deg C
g
TO-100
*Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage
to the device. These are stress ratings only; the functional operation of this 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.
PACKAGE CHARACTERISTICS
Package
TO-100
LCC-8
ThetaJA
150°C/W
110°C/W
ThetaJC
25°C/W
22°C/W
Device Weight
0.04 oz
0.02 oz
TOP
VIEW
Y +g
X +g
ORDERING GUIDE
Model
MXD202AC
MXD202AL
Package Style
TO-100 Metal Can
LCC-8 SMD
*
LCC-8
TO-100
Axes of Sensitivity
*
LCC parts are shipped in tape and reel packaging.
NOTE
Drops onto hard surfaces can cause shocks of greater than 50,000g
and exceed the absolute maximum rating of the device.
Care should be exercised in handling to avoid damage.
Y +g
CAUTION
ESD (electrostatic discharge) sensitive device.
TOP
VIEW
X +g
LCC-8
Axes of Sensitivity
MXD202 DIGITAL Data Sheet K 8/1/01
®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: 978.623.8188 • Fax: 978.623.9945
www.memsic.com
Data Sheet
MXD202
Page 4 of 8
Pin Function Descriptions
TOP-100 and LCC-8
PIN DESCRIPTION: TO -100 Package
Pin
1
2
3
4
5
6
7
8
9
10
Name
VDD
TOUT
AOUTY
GND
n/c
VDA
AOUTX
VREF
SCK
n/c
Description
Digital Supply Voltage
Temperature
Acceleration Signal
Ground
no connection
Analog Supply Voltage
Acceleration Signal
2.50V Reference Voltage
Serial Clock
no connection
1
2
3
4
10
9
8
7
*
5
6
Top View
PIN DESCRIPTION: LCC-8 Package
Pin
1
2
3
4
5
6
7
8
Name
TOUT
AOUTY
GND
VDA
AOUTX
VREF
SCK
VDD
Description
Temperature
Acceleration Signal
Ground
Analog Supply Voltage
Acceleration Signal
2.50V Reference Voltage
Serial Clock
Digital Supply Voltage
*
*
Optional external clock factory programmed
per customer request
Top View
MXD202 DIGITAL Data Sheet K 8/1/01
®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: 978.623.8188 • Fax: 978.623.9945
www.memsic.com
Data Sheet
MXD202
Page 5 of 8
Pin Definition
VDD
- This is the digital power supply input for the MX20XX. The DC voltage should be between 2.70 and
5.25 volts.
VDA
- This is the analog power supply input for the MX20XX. VDA should always be connected to VDD.
GND
- This is the ground pin for the MX20XX.
AOUTX
- This pin is the output of the x-acceleration sensor.
AOUTY
- This pin is the output of the y-acceleration sensor.
TOUT
- This pin is the buffered output of the temperature sensor. The voltage at TOUT is an indication of the
die temperature. This voltage can be measured and used to compensate out the temperature dependence of
accelerometer sensitivity.
SCK
- Standard product is delivered with an Internal Clock option. Ground this pin when operating with the
Internal Clock. The External Clock must be ordered special from the factory.
VREF
- A reference voltage is output from this pin.
MXD202 DIGITAL Data Sheet K 8/1/01
®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: 978.623.8188 • Fax: 978.623.9945
www.memsic.com
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