CXTA
Solid State, analog SerieS
•
Small, Low-Cost, Rugged
•
Rapid Response
•
± 75° Range
•
Fully Conditioned
Analog Outputs
Applications
•
Scissor Lifts
•
Static Platforms
•
Survey Leveling Equipment
•
Laser Leveling
CXTA01, CXTA02
The CXTA single- and dual-axis
analog tilt sensors offer resolution,
accuracy, and fast response in an
inexpensive, easy-to-use package.
The CXTA series design centers on a
highly stable silicon micro-machined
capacitive inclination sensor ele-
ment. The CXTA series is fully signal
conditioned with high level analog
output(s), and optional analog
temperature signal.
Micro-machined devices, perfected in
automotive safety applications, offer
several distinct advantages over fluid,
electrolytic, and pendulum-based
sensors. Like other solid-state devices,
they are more reliable than their me-
chanical counterparts. In a package
smaller than many pendulum or fluid
raw sensing elements, completely
integrated electronics eliminate the
need for external components.
Unlike other micro-machined devices,
the CXTA Series maintains its accu-
racy and stability over temperature:
< 2° of arc over the range 0° to 70° C.
The output can be user corrected for
temperature with the T option, yield-
ing accuracy to within ± 0.5° over the
angular range.
A typical configuration using CXTA
sensors is shown below. Each mod-
ule is factory calibrated, tested and
includes a calibration sheet. The
module can be securely attached us-
ing screws or adhesive. The CXTA is
available in a standard nylon or high
temperature aluminum package.
6-30V
GND
Power
Supply
A/D
Converter
CXTA02
Xout
Yout
Temp (optional)
Typical CXTA02 Configuration
Micromachined
Tilt Sensor Element
Phone: 408.964.9700
Fax: 408.854.7702
E-mail: infoca@memsic.com
w w w. m e m s i c . c o m
Specifications
Performance
Linear Angular Range (°)
Full Angular Range (°)
Angular Resolution (° rms)
Sensitivity - small angles (mV/ )
O
CXTA01
± 20
± 75
0.05
35 ± 2
0.01
2.5 ± 0.15
1.0
0.03
< 0.4
50
0.2
± 1
< 5
-55 to +85
-40 to +85
-55 to +105
-40 to +105
10
2000
6 - 30
4
CXTA02
± 20
± 75
0.05
35 ± 2
0.01
2.5 ± 0.15
1.0
0.03
< 0.4
50
0.2
± 1
< 5
-55 to +85
-40 to +85
-55 to +105
-40 to +105
10
2000
6 - 30
8
Remarks
Actual value provided with Sensor
Actual value provided with Sensor
Typical
Typical
Over ± 20
O
not including Arcsine Error
Sensitivity Drift (%/ C)
O
Zero Angle Voltage (Volts)
Zero Angle Drift (mV/ C)
O
ø
ø = sin
-1
Vout (V) - Zero Angle Voltage (V)
Sensitivity
(V/rad)
Zero Angle Drift
(O
/
O
C)
Non-Linearity (°)
Bandwidth (Hz)
Settling Time (sec)
Alignment (°)
Cross-axis Sensitivity (%))
Environment
Storage Temperature (
O
C)
Operating Temperature ( C)
O
Typical
Inclusive of alignment error
Nylon Package
Nylon Package
-AL High Temperature Package
-AL High Temperature Package
20-2 kHz random
1 ms, half sine
Unregulated
Storage Temperature ( C)
O
Operating Temperature (
O
C)
Non-Operating Vibration (g rms)
Shock (g)
Electrical
Supply Voltage (VDC)
Current (mA)
Physical
Size (Nylon Package)
(Aluminum Package)
Weight (Nylon Package)
(Aluminum Package)
Figure 1
Sensitivity (V/rad)
.78 x 1.75 x 1.07” (1.98 x 4.45 x 2.72 cm)
.95 x 2.00 x 1.20“ (2.41 x 5.08 x 3.05 cm)
1.38 oz (43 gm)
2.09 oz (65 gm)
Specifications subject to change without notice
Principle of Operation
The CXTA Series Tilt Sensors use a
micro-machined acceleration sensing
element with a DC response to
measure inclination relative to grav-
ity. The response of the tilt sensor
depends on the magnitude of gravity
parallel to the sensor element. The
output of the tilt sensor will be an
offset voltage plus the voltage re-
sponse proportional to the amount
of gravity measured by the sensor.
Using the CXTA Sensor
The voltage response of the CXTA
is proportional to the sine of the tilt
angle.
Accurately measuring tilt angle
involves solving the equation shown
in Figure 1. To solve this equation the
Zero Angle Voltage and Sensitivity
must be determined prior to use, and
the sensitivity must be converted to
V/rad. MEMSIC provides this infor-
mation on a calibration sheet with its
CXTA products.
ø = Vout - Zero Angle Voltage
Sensitivity
For angles less than 20°, the sine
function can be approximated by a
linear relationship between the Vout
and the tilt angle in degrees. Thus
the simplified equation for small
angle in degrees is:
When the tilt angle is less than 20°,
the error from linear approximation
will be less than 2%. This is conve-
nient when you don’t have or want
the computing power to calculate an
inverse sine function.
Pin
1
2
3
4
5
Color
Red
Black
White
Yellow
Green
Function
Power
Ground
Roll
Pitch
Temp
Pin Diagram
Ordering Information
Model
CXTA01
CXTA02
OPTIONS
-T
Temperature Sensor Internal
High Temperature Aluminum Package
Axes
X
X,Y
Linear Range
± 20
º
Full Range
± 75
º
± 75
º
Resolution
0.05
º
0.05
º
± 20
º
Optional Aluminum Package
-AL
call factory for other configurations
MEMSIC Inc.
San Jose, California
w w w. m e m s i c . c o m
6020-0013-03 Rev A
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
MEMSIC
:
CXTA01-T-AL CXTA01-T CXTA02-T
