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