Preliminary
SCA103T Series
Inclinometer
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
ELECTRICAL CHARACTERISTICS
Electrical characteristics
Condition
Min
Typ
Max
4.75
5.0
5.25
V
4
5
mA
Supply voltage Vdd (1
Current consumption
Vdd = 5 V; No load
Analog resistive output load
Vout to Vdd or Vss
10
kOhm
Analog capacitive output load
20
Digital output load
@ 500kHz clock
SPI clock frequency
AD conversion time
Data transfer time
@500 kHz clock
Units
nF
1
nF
500
kHz
150
µs
38
µs
PERFORMANCE CHARACTERISTICS
D/S Performance
characteristics
Condition
D
Measuring range (2
Nominal
D
Measuring direction (3
Mounting plane horizontal
S
Zero point (4
Mounting position
D
Sensitivity
@ room temperature
S
Offset calibration accuracy (6a, 13
D
Offset temperature dependency
@ room temperature
(6b, 13
D
0...70°C
-25…85°C
D
-40…125°C
SCA103T-D04
SCA103T-D05
Units
±15
±0.26
Horizontal
±30
±0.5
Horizontal
°
g
Vdd/2
280(15
16(5a
0.057
±1
< ± 0.11
< ±2
< ±0.14
< ±2.5
< ±0.29
< ±5
±0.5
Vdd/2
140(15
8(5b
0.11
±2
< ±0.11
< ±2
< ±0.14
< ±2.5
< ±0.29
< ±5
±0.5
V
mV/°
V/g
°
mg
°
mg
°
mg
°
mg
%
S
Sensitivity calibration accuracy (7a, 13
@ room temperature
D
Sensitivity temperature error (7b, 13
-40...85°C
-1…1
-1…1
%
-40…125°C
-2.5…1
±0.11
±2
4
%
°
mg
%
Hz
D
D
Typical non-linearity (8
Over measuring range
S
Cross-axis sensitivity (11
@ room temperature
-2.5…1
±T.B.D
±T.B.D
4
S
Frequency response –3dB (LP) (9
@ room temperature
8…28
8…28
S
Ratiometric error
Vdd = 4.75...5.25V
1
1
%
D
Output noise density (12
From DC...100Hz
D
Digital output resolution
Effective Differential
D
Long term stability (14
@ steady temp
0.0004
0.009
12
< 0.014
0.0004
0.017
12
< 0.014
°/√Hz
°/LSB
Bits
°
(10
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
Note 1.
Note 2.
Note 3.
Note 4.
Note 5a.
Note 5b.
Note 6a.
Note 6b.
Note 7a.
Note 7b.
Rev. 6 Apr 2005
For maximum accuracy the supply voltage should be 5 ± 0.05 V.
100nF supply filtering 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 specified as Voffset = Vout(0g) [ V ]. See note 12.
Sensitivity specified as Vsens = {Vout(+0.26g) - Vout(-0.26g)}/0.52 [ V/g ]. See note 12
Sensitivity specified as Vsens = {Vout(+0.5g) - Vout(-0.5g)}/1 [ V/g ]. See note 12
Offset calibration error specified as Offset_Calib_error = {Vout(0g) – Vdd/2} / Vsens [ g ].
Offset temperature error specified as Offset Error @ temp. = {Vout @ temp. – Vout @ room temp.}
/ Vsens [ g ]
Vsens = Nominal sensitivity. See note 12.
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% [ % ]. See note 12.
VTI Technologies reserves the right to modify this specification without prior to notice.
Note 8.
Note 9.
From straight line through sensitivity calibration points.
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 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.
Factory calibration value.
Power continuously connected.
Is valid between angles 0° to 1°.
Note 12.
Note 13.
Note 14.
Note 15.
SCA103T Series
ABSOLUTE MAXIMUM RATINGS
Parameter
Value
Acceleration (powered or non powered)
20 000
Unit
g
Supply voltage
-0.3 V to +5.5 V
V
Voltage at input/output pins
-0.3 V to (Vdd+0.3V)
V
Temperature range
-55…125
°C
ELECTRICAL CONNECTION
Pin#
Pin Name
I/O
Connection
1
SCK
Input
Serial clock
2
Ext_C_1
Input
Channel 1 external capacitor input
3
MISO
Output
Master in slave out; data output
4
MOSI
Input
Master out slave in; data input
5
Out_2
Output
Channel 2 output
6
VSS
Power
Negative supply voltage (VSS)
7
CSB
Input
Chip select (active low)
8
Ext_C_2
Input
Channel 2 external capacitor input
9
ST_2
Input
Self test input for Channel 2
10
ST_1
Input
Self test input for Channel 1
11
Out_1
Output
Channel 1 output
12
VDD
Power
Positive supply voltage (VDD)
If The SPI interface is not used SCK (pin1), MISO (pin3), MOSI (pin4)
and CSB (pin7) must be left floating.
Self test can be activated applying logic “1” (positive supply voltage
level) to ST pins (pins 9 & 10). If ST feature is not used, then pins 9 & 10
must be left floating or connected to GND.
DIMENSIONS
PCB PAD LAYOUTS
The part weights < 1.2 g. The size is approximately 9 x 5 x 16 mm (w x h x l). Pin pitch is standard 100 mils.
103T
APPLICATION EXAMPLE
Single ended output can be formed from differential outputs by using external differential amplifier.
Typical output characteristics
+5V
+15V
5,0000
4,0000
Out 2
100nF
Out 1
3,0000
Outputs [V]
2,0000
SCA103T
1,0000
0,0000
1
2
3
4
OUT 2 5
6
Differential output
-1,0000
-2,0000
-3,0000
-4,0000
-5,0000
-40
-30
-20
-10
0
10
20
30
40
Angle [°]
VTI Technologies Oy
Myllynkivenkuja 6
P.O. Box 27
FI-01621 Vantaa
Finland
Tel. +358 9 879181
Fax +358 9 87918791
sales@vti.fi
VTI Technologies Oy
Frankfurt Branch
Rennbahnstr. 72-74
D-60528 Frankfurt am Main
Germany
Tel. +49 69 6786 880
Fax +49 69 6786 8829
sales.de@vti.fi
VTI Technologies, Inc.
One Park Lane Blvd.
Suite 804 - East Tower
Dearborn, MI 48126
USA
Tel. +1 313 425 0850
Fax +1 313 425 0860
[email protected]
12
11 OUT 1
10
9
100nF
8
7
5k11
71 5
INA114
2
–
6
5k11
3
+
A1
4 8
10n
10n
OUTPUT
100nF
−15V