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 鹵
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鈭欻z, 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/擄C. This device can be temperature
compensated easily. The change in sensitivity over the temperature range 鈥?0擄C to 125擄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 擄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擄C to 125擄C.
Features
鈥?Dual axis acceleration outputs
鈥?Digital outputs
鈥?1.0
mg
Resolution in 1Hz bandwidth
鈥?40 Hz Bandwidth expandable to 160 Hz
鈥?Quiescent Supply Voltage: 3.5 mA
鈥?0g output 50% duty cycle
鈥?50,000g shock survival
鈥?2.70V to 5.25V Single Supply
鈥?On-chip mixed signal processing
鈥?Continuous sensors self test
鈥?Temperature sensor output (Tout) 5mV/擄K
鈥?Packaged in 8 pin LCC SMD or
10 pin TO-100 THRU-HOLE
鈥?Hermetically sealed packaging
鈥?Reference voltage (V
REF
) 2.50V
Applications
鈥?Automotive -
Vehicle Security/Active Suspension/ABS/HED Angle Control
鈥?Security -
Gas Line/Elevator/Fatigue Sensing
鈥?Office Automation Equipment -
Computer Peripherals/Disk Drives/PDA鈥檚/Mouse
Smart Pens/Cell Phones/Printer Head Acceleration Sensor
鈥?Gaming -
Joystick/RF Interface/Menu Selection
鈥?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
廬MEMSIC, Inc. 2000.
100 Burtt Road, Andover, MA 01810
Tel: 978.623.8188 鈥?Fax: 978.623.9945
www.memsic.com
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