Ultra Low Noise, Low offset Drift
±1 g Dual
Axis Accelerometer with Digital Outputs
MXD2020E/FL
FEATURES
Resolution better than 1 milli-g
Dual axis accelerometer fabricated on a monolithic CMOS IC
On-chip mixed mode signal processing
50,000 g shock survival rating
17 hz bandwidth
3.00V to 5.25V single supply operation
Small (5mm x 5mm x 2mm) surface mount package
Continuous self-test
Independent axis programmability (special order)
APPLICATIONS
Automotive – Vehicle Security/Active Suspension/ABS
Headlight Angle Control/Tilt Sensing
Security – Gas Line/Elevator/Fatigue Sensing
Office Equipment – Computer Peripherals/PDA’s/Mouse
Smart Pens/Cell Phones
Gaming – Joystick/RF Interface/Menu Selection/Tilt Sensing
Projectors - Leveling and Keystoning
White Goods – Spin/Vibration Control
Internal
Oscillator
Sck
(optional)
CLK
Heater
Control
X axis
Y axis
Factory Adjust
Offset & Gain
Low Pass
Filter
Low Pass
Filter
Temperature
Sensor
Voltage
Reference
V
REF
D
OUTX
V
DD
V
DA
Gnd
2-AXIS
SENSOR
D
OUTY
T
OUT
Continous
Self Test
MXD2020E/F FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTION
The MXD2020E/F is an ultra low noise and low cost, dual
axis accelerometer built on a standard, submicron CMOS
process. The MXD2020E/F measures acceleration with a
full-scale range of
± 1 g. (The MEMSIC accelerometer
product line extends from
±1 g to ±200 g with custom
versions available above
±10 g.) It can measure both
dynamic acceleration (e.g., vibration) and static
acceleration (e.g., gravity). The MXD2020E/F design is
based on heat convection and requires no solid proof mass.
This eliminates stiction and particle problems associated
with competitive devices and provides shock survival up to
50,000 g, leading to significantly lower failure rates and
lower losses due to handling during assembly.
The MXD2020E/F provides a digital output. The outputs
are digital signals with duty cycles (ratio of pulse width to
period) that are proportional to acceleration. The duty
cycles outputs can be directly interfaced to a micro-
processor.
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 implication or otherwise under any patent or
patent rights of MEMSIC
The typical noise floor is 0.2mg / Hz allowing signals
below 1 milli-g to be resolved at 1 Hz bandwidth. The
MXD2020E/F is available in a low profile LCC surface
mount package (5mm x 5mm x 2mm height). It is
hermetically sealed and operational over a -40
°C to +105°C
temperature range.
Due to the standard CMOS structure of the MXD2020E/F,
additional circuitry can easily be incorporated into custom
versions for high volume applications. Contact the factory
for more information.
MEMSIC, Inc.
800 Turnpike St., Suite 202, North Andover, MA 01845
Tel: 978.738.0900
Fax: 978.738.0196
www.memsic.com
MEMSIC MXD2020E/FL Rev D
Page 1 of 8
11/14/2003
