CXTA
Solid Ste,at analog SerieS
Small, Low-Cost, Rugged
Rapid Response
75 Range
Fully Conditioned
Analog Outputs
Applications
CXTA01, CXTA02
Scissor Lifts
The CXTA single- and dual-axis Unlike other micro-machined devices,
Static Platforms
analog tilt sensors offer resolution, the CXTA Series maintains its accu -
accuracy, and fast response in an racy and stability over temperature:
Survey Leveling Equipment
inexpensive, easy-to-use package. < 2 of arc over the range 0 to 70 C.
T h e C X TA s e r i e s d e s i g n c e n t e r s o n a The output can be user corrected for
Laser Leveling
h i g h l y s t a b l e s i l i c o n m i c r o - m a c h i n e d temperature with the T option, yield -
capacitive inclination sensor ele - ing accuracy to within 0.5 over the
m e n t . T h e C X TA s e r i e s i s f u l l y s i g n a l angular range.
c o n d i t i o n e d w i t h h i g h l e v e l a n a l o g
A t y p i c a l c o n f i g u r a t i o n u s i n g C X TA
o u t p u t ( s ) , a n d o p t i o n a l a n a l o g
sensors is shown below. Each mod -
temperature signal.
u l e i s f a c t o r y c a l i b r a t e d , t e s t e d a n d
M i c r o - m a c h i n e d d e v i c e s , p e r f e c t e d i n includes a calibration sheet. The
automotive safety applications, offer module can be securely attached us -
several distinct advantages over fluid, ing screws or adhesive. The CXTA i s
e l e c t r o l y t i c , a n d p e n d u l u m - b a s e d a v a i l a b l e i n a s t a n d a r d n y l o n o r h i g h
sensors. Like other solid-state devices, temperature aluminum package.
they are more reliable than their me -
c h a n i c a l c o u n t e r p a r t s . I n a p a c k a g e
s m a l l e r t h a n m a n y p e n d u l u m o r f l u i d
raw sensing elements, co m p l e t e l y
i n t e g r a t e d e l e c t r o n i c s e l i m i n a t e t h e
need for exter nal components.
Power
6-30V
Supply
GND
A/D
Xout
CXTA02
Converter
Yout
Temp (optional)
Typical CXTA02 Configuration
Micromachined
T ilt Sensor Element
Phone: 408.964.9700 Fax: 408.854.7702 E-mail: infoca@memsic.com www.memsic.co mSpecifications CXTA01 CXTA02 Remarks
Performance
Linear Angular Range () 20 20
Full Angular Range () 75 75
Angular Resolution ( rms) 0.05 0.05
O
Sensitivity - small angles (mV/ ) 35 2 35 2 Actual value provided with Sensor
O
Sensitivity Drift (%/ C) 0.01 0.01
Zero Angle Voltage (Volts) 2.5 0.15 2.5 0.15 Actual value provided with Sensor
O
Zero Angle Drift (mV/ C) 1.0 1.0 Typical
(O O
Zero Angle Drift / C) 0.03 0.03 Typical
= sin -1 Vout (V) - Zero Angle Voltage (V)
O
Non-Linearity () < 0.4 < 0.4 Over 20 not including Arcsine Error Sensitivity
(V/rad)
Bandwidth (Hz) 50 50
Settling T ime (sec) 0.2 0.2
Alignment () 1 1 Typical
Cross-axis Sensitivity (%)) < 5 < 5 Inclusive of alignment error
Environment
O
Storage Temperature ( C) -55 to +85 -55 to +85 Nylon Package
O
Operating Temperature ( C) -40 to +85 -40 to +85 Nylon Package
Figure 1
O
Storage Temperature ( C) -55 to +105 -55 to +105 -AL High Temperature Package
Sensitivity (V/rad)
O
Operating Temperature ( C) -40 to +105 -40 to +105 -AL High Temperature Package
Non-Operating Vibration (g rms) 10 10 20-2 kHz random
Shock (g) 2000 2000 1 ms, half sine
Electrical
Supply Voltage (VDC) 6 - 30 6 - 30 Unregulated
Current (mA) 4 8
Physical
Size (Nylon Package) .78 x 1.75 x 1.07 (1.98 x 4.45 x 2.72 cm)
(Aluminum Package) .95 x 2.00 x 1.20 (2.41 x 5.08 x 3.05 cm)
Weight (Nylon Package) 1.38 oz (43 gm)
(Aluminum Package) 2.09 oz (65 gm)
Specifications subject to change without notice
F o r a n g l e s l e s s t h a n 2 0 , t h e s i n e
Principle of Operation Using the CXTA Sensor
function can be approximated by a
T h e v o l t a g e r e s p o n s e o f t h e C X TA
l i n e a r relationship between the Vout
T h e C X TA S e r i e s T i l t S e n s o r s u s e a
is proportional to the sine of the tilt
and the tilt angle in degrees. Thus
m i c r o - m a c h i n e d a c c e l e r a t i o n s e n s i n g
angle.
the simplified equation for small
element with a DC response to
angle in degrees is:
measure inclination r e l a t i v e t o g r a v -
A c c u r a t e l y m e a s u r i n g t i l t a n g l e
i t y . The response of the tilt sensor
i n v o l v e s s o l v i n g t h e e q u a t i o n s h o w n
When the tilt angle is less than 20,
depends on the magnitude of gravity
i n F i g u r e 1 . To s o l v e t h i s e q u a t i o n t h e
t h e e r r o r f r o m l i n e a r a p p r o x i m a t i o n
p a r a l l e l t o t h e s e n s o r e l e m e n t . T h e
Zero Angle Voltage and Sensitivity
will be less than 2%. This is conve -
o u t p u t o f t h e t i l t s e n s o r w i l l b e a n
m u s t b e d e t e r m i n e d p r i o r t o u s e , a n d
nient when you dont have or want
offset voltage plus the voltage re -
t h e s e n s i t i v i t y m u s t b e c o n v e r t e d t o
t h e c o m p u t i n g p o w e r t o c a l c u l a t e a n
sponse proportional to the amount
V/rad. MEMSIC provides this infor-
inverse sine function.
of gravity measured by the sensor.
mation on a calibration sheet with its
Pin Color Function
CXTA products.
1 Red Power
2 Black Ground
3 White Roll
= Vout - Zero Angle Voltage
4 Yellow Pitch
Sensitivity
5 Green Temp
Pin Diagram
Ordering Information
Model Axes Linear Range Full Range Resolution
CXTA01 X 20 75 0.05
CXTA02 X,Y 20 75 0.05
OPTIONS
-T Temperature Sensor Inter nal
Optional Aluminum Package
-AL High Temperature Aluminum Package
llac yactro f ofr thero stion onfigurac
MEMSIC Inc. San Jose, California www.memsic.co m 6020-0013-03 Rev A