mxd2020g ETC-unknow, mxd2020g Datasheet - Page 4

• Manufacturer Part Number: mxd2020g
• Description: Improved, Ultra Noise Dual Axis Accelerometer With Digital Outputs
• Manufacturer: ETC-unknow

MXD2020G/H/M/N PIN DESCRIPTIONS
V
the sensor heater in the
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
amplifiers in the
connected to V
fabrication suggestions for guidance on external parts and
connections recommended.
Gnd – This is the ground pin for the
D
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
sensitivities on the x- and y-axes. Contact the factory for
additional information.
D
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
sensitivities on the x- and y-axes. Contact the factory for
additional information.
T
sensor. The analog voltage at T
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
set at 2.50V typical and has 100µA of drive capability.
MEMSIC MXD2020G/M/N/H Rev.E
OUTY
OUT
DD
DA
OUTX
ref
accelerometer
accelerometer
– A reference voltage is available from this pin. It is
– This is the supply input for the digital circuits and
– This is the power supply input for the analog
– This pin is the buffered output of the temperature
–
– This pin is the digital output of the x-axis
This pin is the digital output of the y-axis
DD
accelerometer
can be programmed for non-equal
can be programmed for non-equal
. Refer to the section on PCB layout and
accelerometer
. V
OUT
DA
is an indication of the
should always be
. The DC voltage
accelerometer
.
Page 4 of 7
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 1 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).
Figure 1: Accelerometer Position Relative to Gravity
X-Axis
Orientatio
n
To Earth’s
Surface
(deg.)
90
85
80
70
60
45
30
20
10
5
0
Y
Table 1: Changes in Tilt for X- and Y-Axes
Top View
X Output
1.000
0.996
0.985
0.940
0.866
0.707
0.500
0.342
0.174
0.087
0.000
(g)
X-Axis
X
per deg.
Change
of tilt
(mg)
12.23
15.04
16.35
17.16
17.37
17.45
+90
0.15
1.37
2.88
5.86
8.59
0
Y Output
0
0
0.000
0.087
0.174
0.342
0.500
0.707
0.866
0.940
0.985
0.996
1.000
(g)
Y-Axis
gravity
3/25/2005
per deg.
Change
17.45
17.37
17.16
16.35
15.04
12.23
of tilt
(mg)
8.59
5.86
2.88
1.37
0.15