SCA100T Series
Inclinometer
FEATURES
BENEFITS
•
•
•
2-axis inclination measurement (X and Y)
Available ranges 0.5 g ( 30 °), 1.0 g ( 90 °)
Over damped frequency response by Sensing Element
(-3 dB @ 8...28 Hz)
0.003 ° resolution (10 Hz BW, analog output)
Advanced internal and external connection failure detection
Digitally activated electrostatic sensing element self test
Continuous memory parity check
Single +5 V supply; ratiometric voltage output
Serial Peripheral Interface (SPI) compatible
Internal temperature sensor, accessible via SPI
Lead-free reflow solderable lead-free component
•
Excellent reliability and stability over time
and temperature
Instrumentation grade performance
High resolution and low noise
Wide temperature range
•
•
•
•
•
•
•
•
•
•
•
•
Outstanding overload and shock durability
APPLICATIONS
•
•
•
•
2-axis platform levelling
Inclination based position measurement
Tilt measurement with cross-axis compensation
360 ° vertical orientation measurement
ELECTRICAL CHARACTERISTICS
Parameter
Condition
Min
Typ.
Max
Units
Supply voltage Vdd (1
Current consumption
Analogue output load
4.75
5.0
4
5.25
5
V
mA
kOhm
nF
Vdd = 5 V; No load
Vout to Vdd or Vss
10
20
1
Digital output load
SPI clock frequency
AD conversion time
Data transfer time
@ 500 kHz clock
@500 kHz clock
nF
500
kHz
µs
150
38
µs
PERFORMANCE CHARACTERISTICS
SCA100T-D01
( 30 °)
SCA100T-D02
( 90 °)
Parameter
Condition
Units
Measuring range (2
Nominal
°
30
90
g
0.5
1
Measuring direction (3
Mounting plane horizontal
Mounting plane vertical
Mounting position
@ room temperature
@ room temperature
0...70 °
Dual axis inclination
Dual axis inclination
Orthogonal rotation
Orthogonal rotation
Zero point (4
Vdd/2
4(5a
2
Vdd/2
2(5b
4
V
V/g
mg
mg
mg
mg
%
Sensitivity
Offset calibration accuracy (6a, 13
Offset temperature dependency (6b, 13
5
5
-25…85 °C
10
10
-40…125 °C
15
15
Sensitivity calibration accuracy (7a, 13
Sensitivity temperature error (7b, 13
@ room temperature
-40…85 °C
0.5
-1...1
-2.5...1
2
0.5
-1...1
-2.5...1
10
%
85…125 °C
%
Typical non-linearity (8
Cross-axis sensitivity (11
Frequency response –3 dB (LP) (9
Over measuring range
@ room temperature
@ room temperature
Vdd = 4.75...5.25 V
From DC...100 Hz
FS
mg
%
4
4
8…28
2
8…28
2
Hz
(10
Ratiometric error
%
Output noise density (12
Digital output resolution
Long term stability (14
15
15
µg/ Hz
Bits
mg
11
11
@ steady temp
0.25
T.B.D
VDD = 5.00 V, APPLIES TO BOTH CHANNELS UNLESS OTHERWISE SPECIFIED
Note 8
Note 9
From straight line through sensitivity calibration point.
The output has true DC (0 Hz) response.
Note 1
For maximum accuracy the supply voltage should be 5 0.05 V. 100 nF supply filtering capacitor
is recommended.
Note 2
Note 3
The measuring range is limited by sensitivity, offset and supply voltage rails of the device.
Measuring directions in parallel to mounting plane, arrows showing positive acceleration direction
Offset specified as Voffset = Vout(0 g) [ V ]. See note 12.
Sensitivity specified as Vsens = {Vout(+0.5 g) - Vout(-0.5 g)}/1 [ V/g ]. See note 12.
Sensitivity specified as Vsens = {Vout(+1 g) - Vout(-1 g)}/2 [V/g ]. See note 12.
Offset calibration error specified as Offset_Calib_error = {Vout(0 g) – Vdd/2} / Vsens [ g ].
Offset temperature error specified as Offset Error @ temp. = {Vout @ temp. – Vout @ room temp.}
/ Vsens [ g ].
Note 10
Note 11
Note 12
The ratiometric error is specified as:
Note 4
Note 5a
Note 5b
Note 6a
Note 6b
The cross-axis sensitivity determines how much inclination / acceleration, perpendicular to
the measuring axis, couples to the output. The total crossaxis sensitivity is the geometric
sum of the sensitivities of the two axis which are perpendicular to the measuring axis.
In addition, supply voltage noise couples to the output due to the ratiometric nature of the
accelerometer.
Note 7a
Note 7b
Sensitivity calibration error specified as Sensitivity_calibr_error = { Vsens - Vsens_nom} /
Vsens_nom x 100 % [%] Vsens_nom = nominal sensitivity.
Sensitivity temperature error specified as Sensitivity error @ temp = { [Vsens @ temp –Vsens
@ room temp] / Vsens @ room temp x 100 % [% ].
Note 13
Note 14
Factory calibration value.
Power continuously connected.
Rev. 2 / 15 Sept 2005
VTI Technologies reserves the right to modify this specification without prior to notice.
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