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MXD2020HL 데이터시트 PDF




Memsic에서 제조한 전자 부품 MXD2020HL은 전자 산업 및 응용 분야에서
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부품번호 MXD2020HL 기능
기능 Dual Axis Accelerometer
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MXD2020HL 데이터시트, 핀배열, 회로
Improved, Ultra Low Noise ±1 g
Dual Axis Accelerometer with
Digital Outputs
MXD2020GL/HL
MXD2020ML/NL
FEATURES
Resolution better than 1 milli-g
Dual axis accelerometer fabricated on a monolithic CMOS IC
On chip mixed mode signal processing
No moving parts
50,000 g shock survival rating
17 Hz bandwidth expandable to >160 Hz
3.0V to 5.25V single supply continuous operation
Continuous self test
Independent axis programmability (special order)
Compensated for Sensitivity over temperature
Ultra low initial Zero-g Offset
APPLICATIONS
Automotive – Vehicle Security/Vehicle stability control/
Headlight Angle Control/Tilt Sensing
Security – Gas Line/Elevator/Fatigue Sensing
Information Appliances – Computer Peripherals/PDA’s/Mouse
Smart Pens/Cell Phones
Gaming – Joystick/RF Interface/Menu Selection/Tilt Sensing
GPS electronic Compass tilt Correction
Consumer LCD projectors, pedometers, blood pressure
Monitor, digital cameras
GENERAL DESCRIPTION
The MXD2020GL/HL/ML/NL is a low cost, dual axis
accelerometer fabricated on a standard, submicron CMOS
process. It is a complete sensing system with on-chip
mixed mode signal processing. The
MXD2020GL/HL/ML/NL measures acceleration with a
full-scale range of ±1 g and a sensitivity of 20%/g. It can
measure both dynamic acceleration (e.g. vibration) and
static acceleration (e.g. gravity).
The MXD2020GL/HL/ML/NL 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 of 50,000
g, leading to significantly lower failure rate and lower loss
due to handling during assembly.
Sck
(optional)
Internal
O s c illa to r
CLK
Heater
Control
Continous
Self Test
T e m p e ra tu re
Sensor
Voltage
Reference
X axis
LPF
A/D
Factory Adjust
Offset & Gain
2-AXIS
SENSOR
Y axis
Vdd
Gnd
LPF
A/D
Vda
Tout
Vref
Dout X
Dout Y
MXD2020GL/HL/ML/NL FUNCTIONAL BLOCK
DIAGRAM
The MXD2020GL/HL/ML/NL provides two digital outputs
that are set to 50% duty cycle at zero g acceleration. The
outputs are digital with duty cycles (ratio of pulse width to
period) that are proportional to acceleration. The duty
cycle outputs can be directly interfaced to a micro-
processor.
The typical noise floor is 0.2 mg/ Hz allowing signals
below 1 milli-g to be resolved at 1 Hz bandwidth. The
MXD2020GL/HL/ML/NL is packaged in a hermetically
sealed LCC surface mount package (5 mm x 5 mm x 2 mm
height) and is operational over a -40°C to 105°C(M/NL) and
0°C to 70°C(G/HL) temperature range.
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.
800 Turnpike St., Suite 202, North Andover, MA 01845
Tel: 978.738.0900
Fax: 978.738.0196
www.memsic.com
MEMSIC MXD2020GL/ML
Page 1 of 7
2002.08.29.1




MXD2020HL pdf, 반도체, 판매, 대치품
MXD2020GL/HL/ML/NL PIN DESCRIPTIONS
VDD – This is the supply input for the digital circuits and
the sensor heater in the accelerometer. The DC voltage
should be between 3.0 and 5.25 volts. Refer to the section
on PCB layout and fabrication suggestions for guidance on
external parts and connections recommended.
VDA – This is the power supply input for the analog
amplifiers in the accelerometer. VDA should always be
connected to VDD. Refer to the section on PCB layout and
fabrication suggestions for guidance on external parts and
connections recommended.
Gnd – This is the ground pin for the accelerometer.
DOUTX – This pin is the digital output of the x-axis
acceleration sensor. It is factory programmable to 100 Hz
or 400 Hz. The user should ensure the load impedance is
sufficiently high as to not source/sink >100µA typical.
While the sensitivity of this axis has been programmed at
the factory to be the same as the sensitivity for the y-axis,
the accelerometer can be programmed for non-equal
sensitivities on the x- and y-axes. Contact the factory for
additional information.
DOUTY This pin is the digital output of the y-axis
acceleration sensor. It is factory programmable to 100 Hz
or 400 Hz. The user should ensure the load impedance is
sufficiently high as to not source/sink >100µA typical.
While the sensitivity of this axis has been programmed at
the factory to be the same as the sensitivity for the x-axis,
the accelerometer can be programmed for non-equal
sensitivities on the x- and y-axes. Contact the factory for
additional information.
TOUT – This pin is the buffered output of the temperature
sensor. The analog voltage at TOUT is an indication of the
die temperature. This voltage is useful as a differential
measurement of temperature from ambient and not as an
absolute measurement of temperature.
Sck – The standard product is delivered with an internal
clock option (800kHz). This pin should be grounded
when operating with the internal clock. An external
clock option can be special ordered from the factory
allowing the user to input a clock signal between 400kHz
And 1.6MHz
Vref – A reference voltage is available from this pin. It is
set at 2.50V typical and has 100µA of drive capability.
DISCUSSION OF TILT APPLICATIONS AND
RESOLUTION
Tilt Applications: One of the most popular applications of
the MEMSIC accelerometer product line is in
tilt/inclination measurement. An accelerometer uses the
force of gravity as an input to determine the inclination
angle of an object.
A MEMSIC accelerometer is most sensitive to changes in
position, or tilt, when the accelerometer’s sensitive axis is
perpendicular to the force of gravity, or parallel to the
Earth’s surface. Similarly, when the accelerometer’s axis is
parallel to the force of gravity (perpendicular to the Earth’s
surface), it is least sensitive to changes in tilt.
Table 1 and Figure 2 help illustrate the output changes in
the X- and Y-axes as the unit is tilted from +90° to 0°.
Notice that when one axis has a small change in output per
degree of tilt (in mg), the second axis has a large change in
output per degree of tilt. The complementary nature of
these two signals permits low cost accurate tilt sensing to
be achieved with the MEMSIC device (reference
application note AN-00MX-007).
X
+900
IC
S
M
E
00
gravity
Y
Top View
Figure 2: Accelerometer Position Relative to Gravity
X-Axis
Y-Axis
X-Axis
Orientatio
Change
Change
n X Output per deg. Y Output per deg.
To Earth’s
(g)
of tilt
(g)
of tilt
Surface
(mg)
(mg)
(deg.)
90
1.000
0.15 0.000 17.45
85
0.996
1.37 0.087 17.37
80
0.985
2.88 0.174 17.16
70
0.940
5.86 0.342 16.35
60
0.866
8.59 0.500 15.04
45
0.707
12.23
0.707
12.23
30
0.500
15.04
0.866
8.59
20
0.342
16.35
0.940
5.86
10
0.174
17.16
0.985
2.88
5
0.087
17.37
0.996
1.37
0
0.000
17.45
1.000
0.15
Table 1: Changes in Tilt for X- and Y-Axes
MEMSIC MXD2020GL/ML/NL/HL
Page 4 of 7
2002.08.29.1

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MXD2020HL 전자부품, 판매, 대치품
LCC-8 PACKAGE DRAWING
Fig 6: Hermetically Sealed Package Outline
MEMSIC MXD2020GL/ML/NL/HL
Page 7 of 7
2002.08.29.1

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