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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
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 s 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 Cross-axis sensitivity (11 Frequency response -3dB (LP) (9 Ratiometric error
(10
Condition
Nominal Mounting plane horizontal Mounting position @ room temperature @ room temperature
(6b, 13
SCA103T-D04
15 0.26 Horizontal Vdd/2 280(15 16(5a 0.057 1 < 0.11 < 2 < 0.14 < 2.5 < 0.29 < 5 0.5 -1...1 -2.5...1 T.B.D T.B.D 4 8...28 1 0.0004 0.009 12 < 0.014
SCA103T-D05
30 0.5 Horizontal Vdd/2 140(15 8(5b 0.11 2 < 0.11 < 2 < 0.14 < 2.5 < 0.29 < 5 0.5 -1...1 -2.5...1 0.11 2 4 8...28 1 0.0004 0.017 12 < 0.014
Units
g V mV/ V/g mg mg mg mg % % % mg % Hz % /Hz /LSB Bits
Measuring range (2 Measuring direction (3 Zero point (4 Sensitivity Offset calibration accuracy (6a, 13 Offset temperature dependency
0...70C -25...85C -40...125C
Sensitivity calibration accuracy (7a, 13 Sensitivity temperature error (7b, 13
@ room temperature -40...85C -40...125C Over measuring range @ room temperature @ room temperature Vdd = 4.75...5.25V From DC...100Hz Effective Differential @ steady temp
Output noise density (12 Digital output resolution Long term stability (14
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.
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. Note 10. Note 11.
From straight line through sensitivity calibration points. The output has true DC (0Hz) response. The ratiometric error is specified 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 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.
Rev. 6 Apr 2005
SCA103T Series
ABSOLUTE MAXIMUM RATINGS
Parameter
Acceleration (powered or non powered) Supply voltage Voltage at input/output pins Temperature range
Value
20 000 -0.3 V to +5.5 V -0.3 V to (Vdd+0.3V) -55...125
Unit
g V V C
ELECTRICAL CONNECTION
Pin#
1 2 3 4 5 6 7 8 9 10 11 12
Pin Name
SCK Ext_C_1 MISO MOSI Out_2 VSS CSB Ext_C_2 ST_2 ST_1 Out_1 VDD
I/O
Input Input Output Input Output Power Input Input Input Input Output Power
Connection
Serial clock Channel 1 external capacitor input Master in slave out; data output Master out slave in; data input Channel 2 output Negative supply voltage (VSS) Chip select (active low) Channel 2 external capacitor input Self test input for Channel 2 Self test input for Channel 1 Channel 1 output 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
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.
PCB PAD LAYOUTS
103T
APPLICATION EXAMPLE
Single ended output can be formed from differential outputs by using external differential amplifier.
Typical output characteristics
5,0000 4,0000 3,0000 2,0000
Outputs [V]
+5V
+15V
Out 2
Out 1
SCA103T
100nF
71 5 INA114 2 - 6 5k11 3 + A1 48 10n 10n
1,0000 0,0000 -1,0000 -2,0000 -3,0000 -4,0000 -5,0000 -40 -30 -20 -10 0 Angle [] 10 20 30 40
Differential output
1 2 3 4 OUT 2 5 6
12 11 OUT 1 10 9 100nF 8 7
5k11
OUTPUT
100nF
-15V
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 sales@vtitechnologies.com

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