Preliminary
SCA103T Series
Inclinometer
Note 1.
For maximum accuracy the supply voltage should be 5
± 0.05 V.
100nF supply filtering capacitor should be used.
Note 2.
The measuring range is limited by sensitivity, offset and supply voltage rails of the device.
Note 3.
Measuring direction parallel to mounting plane, arrow showing positive direction.
Note 4.
Offset specified as Voffset = Vout(0g) [ V ]. See note 12.
Note 5a.
Sensitivity specified as Vsens = {Vout(+0.26g) - Vout(-0.26g)}/0.52 [ V/g ]. See note 12
Note 5b.
Sensitivity specified as Vsens = {Vout(+0.5g) - Vout(-0.5g)}/1 [ V/g ]. See note 12
Note 6a.
Offset calibration error specified as Offset_Calib_error = {Vout(0g) – Vdd/2} / Vsens [ g ].
Note 6b.
Offset temperature error specified as Offset Error @ temp. = {Vout @ temp. – Vout @ room temp.}
/ Vsens [ g ]
Vsens = Nominal sensitivity. See note 12.
Note 7a.
Sensitivity calibration error specified as Sensitivity_calibr_error = { Vsens - Vsens_nom} /
Vsens_nom x 100% [%] Vsens_nom = nominal sensitivity
Note 7b.
Sensitivity temperature error specified as Sensitivity error @ temp = { [Vsens @ temp –Vsens @
room temp] / Vsens @ room temp x 100% [ % ]. See note 12.
Note 8.
From straight line through sensitivity calibration points.
Note 9.
The output has true DC (0Hz) response.
Note 10.
The ratiometric error is specified as:
Note 11.
The cross-axis sensitivity determines how much inclination / acceleration, perpendicular
to the measuring axis, couples to the output. The total cross-axis sensitivity is the geo-
metric sum of the sensitivities of the two axis which are perpendicular to the measuring
axis.
Note 12.
In addition, supply voltage noise couples to the output due to the ratiometric nature of the
accelerometer.
Note 13.
Factory calibration value.
Note 14.
Power continuously connected.
Note 15.
Is valid between angles 0° to 1°.
FEATURES
• High sensitivity by differential analog output or digital
output via SPI. Single ended signal available by using a
differential amplifier or digitally using internal 11 bit digital
output and external micro controller.
• Available ranges
±15°,±30°
• Over damped frequency response (-3dB @ 8...28 Hz)
• Integrated temperature sensor, accessible via SPI
• Digitally activated electrostatic sensing element self test
• Continuous memory parity check
• Advanced internal and external connection failure detection
• Single +5V supply; ratiometric analog voltage outputs
• Serial Peripheral Interface (SPI) compatible digital output
• DIL-12 plastic SMD package, lead-free reflow solderable
BENEFITS
• High immunity to external interference and noise
supply voltage.
• Improved temperature dependency and long term
stability
• Excellent reliability and stability over time and
temperature
• Instrumentation grade performance
• High resolution and low noise
• Wide operating temperature range
• Outstanding overload and shock durability
APPLICATIONS
• Single axis inclination instruments
• Inclination based position measurement
Rev. 6 Apr 2005
VTI Technologies reserves the right to modify this specification without prior to notice.
ELECTRICAL CHARACTERISTICS
Electrical characteristics
Condition
Min
Typ
Max
Units
Supply voltage Vdd (1
4.75
5.0
5.25
V
Current consumption
Vdd = 5 V; No load
4
5
mA
Analog resistive output load
Vout to Vdd or Vss
10
kOhm
Analog capacitive output load
20
nF
Digital output load
@ 500kHz clock
1
nF
SPI clock frequency
500
kHz
AD conversion time
150
µs
Data transfer time
@500 kHz clock
38
µs
PERFORMANCE CHARACTERISTICS
D/S Performance
characteristics
Condition
SCA103T-D04
SCA103T-D05
Units
D
Measuring range (2
Nominal
±15
±0.26
±30
±0.5
°
g
D
Measuring direction (3
Mounting plane horizontal
Horizontal
Horizontal
S
Zero point (4
Mounting position
Vdd/2
Vdd/2
V
D
Sensitivity
@ room temperature
280(15
16(5a
140(15
8(5b
mV/°
V/g
S
Offset calibration accuracy (6a, 13
@ room temperature
0.057
±1
0.11
±2
°
mg
D
Offset temperature dependency (6b, 13
0...70°C
<
± 0.11
<
±2
<
±0.11
<
±2
°
mg
D
-25…85°C
<
±0.14
<
±2.5
<
±0.14
<
±2.5
°
mg
D
-40…125°C
<
±0.29
<
±5
<
±0.29
<
±5
°
mg
S
Sensitivity calibration accuracy (7a, 13
@ room temperature
±0.5
±0.5
%
D
Sensitivity temperature error (7b, 13
-40...85°C
-1…1
-1…1
%
D
-40…125°C
-2.5…1
-2.5…1
%
D
Typical non-linearity (8
Over measuring range
±T.B.D
±T.B.D
±0.11
±2
°
mg
S
Cross-axis sensitivity (11
@ room temperature
4
4
%
S
Frequency response –3dB (LP) (9
@ room temperature
8…28
8…28
Hz
S
Ratiometric error (10
Vdd = 4.75...5.25V
1
1
%
D
Output noise density (12
From DC...100Hz
0.0004
0.0004
°/
√Hz
D
Digital output resolution
Effective Differential
0.009
12
0.017
12
°/LSB
Bits
D
Long term stability (14
@ steady temp
< 0.014
< 0.014
°
Parameters marked as D are measured in differential mode using external differential amplifier. The performance of selected amplifier may have an effect to some parameters.
Differential signal is determined as a Out_diff = Out_1 – Out_2 (pin 11 – pin 5).
VDD = 5.00 V, APPLIES TO BOTH CHANNELS UNLESS OTHERWISE SPECIFIED
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