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MEMSIC

MXD2020F Datasheet Preview

MXD2020F Datasheet

Dual Axis Accelerometer

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Ultra Low Noise, Low offset Drift ±1 g Dual
Axis Accelerometer with Digital Outputs
FEATURES
Resolution better than 1 mg at 1 Hz
Dual axis accelerometer fabricated on a monolithic CMOS IC
RoHS compliant
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/Cell Phones
Gaming – Joystick/RF Interface/Menu Selection/Tilt Sensing
Projectors - Leveling and Keystoning
White Goods – Spin/Vibration Control
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 and a sensitivity of 20%/g @5V at
25°C. 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 two digital outputs. 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.
MXD2020E/F
Sck
(optional)
Internal
Oscillator
Temperature
Sensor
Voltage
CLK Reference
Heater
Control
Continous
Self Test
X axis
Low Pass
Filter
Factory Adjust
Offset & Gain
2-AXIS
SENSOR
Y axis
VDD Gnd
Low Pass
Filter
VDA
TOUT
VREF
DOUTX
DOUTY
MXD2020E/F FUNCTIONAL BLOCK DIAGRAM
The typical noise floor is 0.2mg / Hz allowing signals
below 1mg to be resolved at 1 Hz bandwidth. The
MXD2020E/F is available in a 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.
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
©MEMSIC, Inc.
One Technology Drive Suite 325,Andover MA01810,USA
Tel: +1 978 738 0900
Fax: + 978 738 0196
www.memsic.com
MEMSIC MXD2020E/F Rev H
Page 1 of 8
2/26/2007




MEMSIC

MXD2020F Datasheet Preview

MXD2020F Datasheet

Dual Axis Accelerometer

No Preview Available !

MXD2020E/F SPECIFICATIONS (Measurements @ 25°C, Acceleration = 0g unless otherwise noted, VDD, VDA =
5.0V unless otherwise specified)
MXD2020E/F
Parameter
SENSOR INPUT
Measurement Range1
Nonlinearity
Alignment Error2
Transverse Sensitivity3
SENSITIVITY
DOUTX and DOUTY
Change over Temperature (uncompensated)4
Change over Temperature (compensated) 4
ZERO g BIAS LEVEL
0 g Offset5
0 g Duty Cycle5
0 g Offset over Temperature
PWM output Frequency
Conditions
Each Axis
Best fit straight line
Each Axis
@5.0V supply
Δ from 25°C, at –40°C
Δ from 25°C, at +105°C
Δ from 25°C, –40°C to +105°C
Each Axis
Δ from 25°C
Δbased on 20%/g
For MXD2020EL only
MXD2020E
MXD2020F
Min
±1.0
19.0
-55
-0.1
48
97
95
380
Typ
0.5
±1.0
±2.0
20.0
<3.0
0.00
50
±0.4
±0.008
100
100
400
Max Units
g
1.0 % of FS
degrees
%
21.0
+120
% Duty
Cycle/g
%
%
%
+0.1 g
52 % Duty Cycle
mg/°C
% / °C
103 Hz
105 Hz
420 Hz
NOISE PERFORMANCE
Noise Density, rms
0.2 0.4 mg/ Hz
FREQUENCY RESPONSE
3dB Bandwidth
15 17 19 Hz
TEMPERATURE OUTPUT
Tout Voltage
Sensitivity
VOLTAGE REFERENCE OUTPUT
VRef output
Change over Temperature
Current Drive Capability
SELF TEST
Continuous Voltage at DOUTX, DOUTY under
Failure
Continuous Voltage at DOUTX, DOUTY under
Failure
@3.0V-5.25V supply
Source
@5.0V Supply, output rails to
supply voltage
@3.0V Supply, output rails to
supply voltage
1.15
4.6
2.4
1.25 1.35
V
5.0 5.4 mV/°K
2.5 2.65
V
0.1 mV/°C
100 μA
5.0 V
3.0 V
DOUTX and DOUTY OUTPUTS
Normal Output Range
Current
Rise/Fall Time
Turn-on Time
Output High
Output Low
Source or sink, @ 3.0V-5.25V supply
3.0 to 5.0V Supply
@5.0V Supply
@3.0V Supply
4.8
90
V
0.2 V
100 μA
100 110
nS
160 mS
300 mS
POWER SUPPLY
Operating Voltage Range
Supply Current
Supply Current
@ 5.0V
@ 3.0V
3.0 5.25 V
2.7 3.3 4.1 mA
3.2 4.0 4.8 mA
TEMPERATURE RANGE
Operating Range
-40
+105
°C
NOTES
1 Guaranteed by measurement of initial offset and sensitivity.
2 Alignment error is specified as the angle between the true and indicated
axis of sensitivity.
3 Transverse sensitivity is the algebraic sum of the alignment and the inherent
sensitivity errors
4 The sensitivity change over temperature for thermal accelerometers is based on
variations in heat transfer that are governed by the laws of physics and it is highly
consistent from device to device. Please refer to the section in this data sheet titled
“Compensation for the Change of Sensitivity over Temperature” for more
information.
5 The device operates over a 3.0V to 5.25V supply range. Please note that
sensitivity and zero g bias level will be slightly different at 3.0V operation. For
devices to be operated at 3.0V in production they can be trimmed at the factory
specifically for this lower supply voltage operation, in which case the sensitivity and
zero g bias level specifications on this page will be met. Please contact the factory
for specially trimmed devices for low supply voltage operation.
6 Output settled to within ±17mg.
MEMSIC MXD2020E/F Rev H
Page 2 of 8
2/26/2007


Part Number MXD2020F
Description Dual Axis Accelerometer
Maker MEMSIC
Total Page 8 Pages
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