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| SCA100T Series Inclinometer FEATURES * 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 BENEFITS * 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 Supply voltage Vdd (1 Current consumption Analogue output load Digital output load SPI clock frequency AD conversion time Data transfer time @500 kHz clock 150 38 Vdd = 5 V; No load Vout to Vdd or Vss @ 500 kHz clock 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 Parameter Measuring range (2 Measuring direction (3 Zero point (4 Sensitivity Offset calibration accuracy (6a, 13 Offset temperature dependency (6b, 13 Condition Nominal Mounting plane horizontal Mounting plane vertical Mounting position @ room temperature @ room temperature 0...70 -25...85 C -40...125 C SCA100T-D01 (30 ) 30 0.5 Dual axis inclination Orthogonal rotation Vdd/2 4(5a SCA100T-D02 (90 ) 90 1 Dual axis inclination Orthogonal rotation Vdd/2 2(5b Units g V V/g mg mg mg mg % % % mg % Hz % g/ Hz Bits mg Sensitivity calibration accuracy (7a, 13 Sensitivity temperature error (7b, 13 Typical non-linearity (8 Cross-axis sensitivity (11 Frequency response -3 dB (LP) (9 Ratiometric error (10 @ room temperature -40...85 C 85...125 C Over measuring range @ room temperature @ room temperature Vdd = 4.75...5.25 V From DC...100 Hz FS @ steady temp 2 5 10 15 0.5 -1...1 -2.5...1 4 5 10 15 0.5 -1...1 -2.5...1 2 4 8...28 10 4 8...28 2 15 11 0.25 2 15 11 T.B.D Output noise density (12 Digital output resolution Long term stability (14 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. 100 nF supply filtering capacitor is recommended. 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 ]. 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 8 Note 9 Note 10 From straight line through sensitivity calibration point. The output has true DC (0 Hz) response. The ratiometric error is specified as: Note 11 Note 12 Note 13 Note 14 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. Factory calibration value. Power continuously connected. Rev. 2 / 15 Sept 2005 VTI Technologies reserves the right to modify this specification without prior to notice. SCA100T Series MEASURING DIRECTIONS 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+0.3 V) -55...125 Unit g V V C ELECTRICAL CONNECTION Pin# 1 2 3 4 5 6 7 8 9 10 11 12 RECOMMENDED CIRCUIT Pin Name SCK Ext_C_1 MISO MOSI Out_2 GND CSB Ext_C_2 ST_2 ST_1 / Test_in Out_1 VDD I/O Input Input Output Input Output Power Input Input Input Input Output Power Connection Serial clock X axis external capacitor input (Ch 1) Master in slave out; data output Master out slave in; data input Y axis Output (Ch 2) round (GND) Chip select (active low) Y axis external capacitor input (Ch 2) Self test input for Y axis (Ch 2) Self test input for X axis (Ch 1 ) X axis output (Ch 1) 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 pin (pin 9 and 10). If ST feature is not used pins 9 and 10 must be left floating or connected to GND. DIMENSIONS The part weights under 1.2 g. The size is appr. (w x h x l) 9 x 5 x 16 mm. Pin pitch is standard 100 mils. PCB PAD LAYOUTS Acceleration in the direction of the arrow will increase the output voltage. VTI Technologies Oy Myllynkivenkuja 6 P.O. Box 27 FI-01621 Vantaa Finland Tel. +358 9 879 181 Fax +358 9 879 18791 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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