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參數(shù)資料
| 型號(hào)： | MXR2312M |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Improved, Ultra Low Noise 【2 g Dual Axis Accelerometer with Ratiometric Outputs |
| 中文描述： | 改進(jìn)的，超低噪音【2克雙軸加速度計(jì)成比例輸出 |
| 文件頁(yè)數(shù)： | 4/6頁(yè) |
| 文件大?。?/td> | 428K |
| 代理商： | MXR2312M |
MXR2312G/M PIN DESCRIPTIONS
V
DD
– 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.
V
DA
– This is the power supply input for the analog
amplifiers in the accelerometer. 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.
A
OUTX
– This pin is the output of the x-axis acceleration
sensor. The user should ensure the load impedance is
sufficiently high as to not source/sink >100
μ
A. 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 on this feature.
MEMSIC MXR2312G/M Rev.E
Page 4 of 6
1/19/2005
A
OUTY
–
This pin is the output of the y-axis acceleration
sensor. The user should ensure the load impedance is
sufficiently high as to not source/sink >100
μ
A. 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 on this feature.
T
OUT
– This pin is the buffered output of the temperature
sensor. The analog voltage at T
OUT
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.
V
ref
– A reference voltage is available from this pin. It is
set at 2.50V typical and has 100
μ
A 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 m
g
), 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
Top View
Y
+90
0
0
0
gravity
M
Figure 2: Accelerometer Position Relative to Gravity
X-Axis
Orientation
To Earth’s
Surface
(deg.)
90
85
80
70
60
45
30
20
10
5
0
X-Axis
Y-Axis
X Output
(
g
)
Change
per deg.
of tilt
(m
g
)
0.15
1.37
2.88
5.86
8.59
12.23
15.04
16.35
17.16
17.37
17.45
Y Output
(
g
)
Change
per deg.
of tilt
(m
g
)
17.45
17.37
17.16
16.35
15.04
12.23
8.59
5.86
2.88
1.37
0.15
1.000
0.996
0.985
0.940
0.866
0.707
0.500
0.342
0.174
0.087
0.000
0.000
0.087
0.174
0.342
0.500
0.707
0.866
0.940
0.985
0.996
1.000
Table 1: Changes in Tilt for X- and Y-Axes
Resolution
: The accelerometer resolution is limited by
noise. The output noise will vary with the measurement
bandwidth. With the reduction of the bandwidth, by
applying an external low pass filter, the output noise drops.
Reduction of bandwidth will improve the signal to noise
ratio and the resolution. The output noise scales directly
with the square root of the measurement bandwidth. The
maximum amplitude of the noise, its peak- to- peak value,
approximately defines the worst case resolution of the
measurement. With a simple RC low pass filter, the rms
noise is calculated as follows:
Noise (mg rms) = Noise(mg/
Hz
) *
)
*
)
(
(
Hz
Bandwidth
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