MEMSIC MXD202AC, MXD202AL Datasheet

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 pri­marily 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 ±

2.0

g 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 pre­dictable and follows the physical gas laws. The following equation can be used to predict the sensitivi-

ty at any given temperature:

SINX (TIN)

2.67
= S

FIN

X (T

FIN

)

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.

General Description

MXD202 (DIGITAL)

Features

Low Cost, 2.0g, Dual Axis Accelerometer
with Digital Outputs

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

Information furnished by MEMSIC is believed to be
accurate and reliable. However, no responsibility is
assumed by MEMSIC 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
implications or otherwise under any patent or patent
rights of MEMSIC.

Technical information.
Subject to change without notice.

®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: [phone] • Fax: [phone]
www.memsic.com

MXD202 DIGITAL Data Sheet K 8/1/01

Page 1 of 8

Data Sheet

MXD202

• 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

Block Diagram of MX20XX

MXD202 SPECIFICATIONS
Digital Electrical Characteristics

NOTES

1

Guarantee by measurements of initial offset
and sensitivity.

2

Alignment error is specified as the angle between
the true and indicated axis of sensitivity.

3

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

4

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.

5

Noise density (% Duty Cycle√/Hz) is the average
noise at any frequency in the bandwidth of the device.

6

The voltage is required to ramp full scale before
making a measurement.

7

Note: Frequency compensating circuit will achieve
160 Hz operations.

8

Defined as the output change from ambient to
maximum temperature or minimum. Output change
expressed in % change of duty cycle.

9

For more details refer to
Application Note (AN-00MX-001).

All min and max specifications are subject to change
without notification.

Information furnished by MEMSIC is believed to be
accurate and reliable. However, no responsibility is
assumed by MEMSIC 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
implications or otherwise under any patent or patent
rights of MEMSIC.

Technical information.
Subject to change without notice.

Page 2 of 8

Data Sheet

®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: [phone] • Fax: [phone]
www.memsic.com

MXD202 DIGITAL Data Sheet K 8/1/01

MXD202

Temperature Changes

8

Delta from 25°C per formula

S

IN

X (TIN)

2.67

= S

FIN

X (T

FIN

)

2.67

SENSOR Each axis
Measurement Range

1

Nonlinearity Best Fit Straight
Alignment Error

2

Line

SENSITIVITY Each axis
Output in Duty Cycle per g

ZERO g BIAS LEVEL Each axis 48 50 52 % Duty Cycle

0g Offset vs. 2.0 mg/°C
Temperature

4

NOISE PERFORMANCE
Noise Density

5

@ +25°C 0.010 0.011 % Duty Cycle

% Duty Cycle /√Hz

FREQUENCY RESPONSE
3 dB Bandwidth 40 Hz
3 dB Bandwidth

7

160 Hz

SELF TEST
Voltage Delta at outputs Continuous,
@5V Supply Output rails with 5.0 V
@2.7V Supply failure 2.7 V

X, Y OUTPUTS Digital signal of100Hz
Rise/Fall Time 90 100 110 nsec

TEMPERATURE RANGE
Operating Range

Tout Voltage 25°C 1.23 1.25 1.27 V
Temp sensor sensitivity 5 mV/°K

V REFERENCE

9

25°C 2.4 2.5 2.6 V

+/- 2.0

2

+/- 1.0 +/- 2.5

10

% Duty Cycle

/g

g
% of FS
degrees

Min Typ Max

Parameter Conditions

MEMSIC MXD202 Units

2.7 5.25 V

3.0 3.5 mA

4.0 4.5 mA
200 400 ms

-40 125 °C

POWER SUPPLY
Operating Voltage Range
Specified Performance
Quiescent Supply Current @ 5V
Quiescent Supply Current @ 2.7V
Turn-On Time

6

Measurements @ 25°C Acceleration = 0g unless otherwise noted
V

DD, VDA = 5.0V unless otherwise specified

Cross-Axis Sensitivity

3

X sensor to Y sensor +/- 2 %

Data Sheet

PACKAGE CHARACTERISTICS

Package ThetaJA ThetaJC Device Weight

TO-100 150°C/W 25°C/W 0.04 oz
LCC-8 110°C/W 22°C/W 0.02 oz

Page 3 of 8

®MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: [phone] • Fax: [phone]
www.memsic.com

MXD202 DIGITAL Data Sheet K 8/1/01

MXD202

TO-100

LCC-8

TO-100

TOP

VIEW

TOP

VIEW

+g

+g

+g

+g

X

X

Y

Y

Axes of Sensitivity

LCC-8

Axes of Sensitivity

ORDERING GUIDE

Model Package Style

MXD202AC TO-100 Metal Can
MXD202AL LCC-8 SMD

*

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.

CAUTION

ESD (electrostatic discharge) sensitive device.

*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.

ABSOLUTE MAXIMUM RATINGS*

Symbol Parameter Rating Units

VDD Supply Voltage to Ground Potential -0.5 to 7.0 Volts

T

STG

Storage Temperature -65 to +150 Deg C

Acceleration 50,000 g

*

LCC parts are shipped in tape and reel packaging.