SCA100T VTI | Alldatasheet

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Technical content

For maximum accuracy the supply voltage should be 5 ±0.05 V. 100 nF supply fi ltering capacitor is recommended. Note 2 The measuring range is limited by sensitivity, offset and supply voltage rails of the device. Note 3 Measuring directions in parallel to mounting plane, arrows showing positive acceleration direction Note 4 Offset specifi ed as Voffset = Vout(0 g) [ V ]. See note 12. Note 5a Sensitivity specifi ed as Vsens = {Vout(+0.5 g) - Vout(-0.5 g)}/1 [ V/g ]. See note 12. Note 5b Sensitivity specifi ed as Vsens = {Vout(+1 g) - Vout(-1 g)}/2 [V/g ]. See note 12. Note 6a Offset calibration error specifi ed as Offset_Calib_error = {Vout(0 g) – Vdd/2} / Vsens [ g ]. Note 6b Offset temperature error specifi ed as Offset Error @ temp. = {Vout @ temp. – Vout @ room temp.} / Vsens [ g ]. Note 7a Sensitivity calibration error specifi ed as Sensitivity_calibr_error = { Vsens - Vsens_nom} / Vsens_nom x 100 % [%] Vsens_nom = nominal sensitivity. Note 7b Sensitivity temperature error specifi ed as Sensitivity error @ temp = { [Vsens @ temp –Vsens @ room temp] / Vsens @ room temp x 100 % [% ]. Note 8 From straight line through sensitivity calibration point. Note 9 The output has true DC (0 Hz) response. Note 10 The ratiometric error is specifi ed as: Note 11 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. 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.

ELECTRICAL CHARACTERISTICS

Typ. Max Units Supply voltage Vdd (1 4.75 5.0 5.25 V Current consumption Vdd = 5 V; No load mA Analogue output load Vout to Vdd or Vss kOhm nF Digital output load @ 500 kHz clock nF SPI clock frequency 500 kHz AD conversion time 150 µs Data transfer time @500 kHz clock µs PERFORMANCE CHARACTERISTICS Parameter Condition SCA100T-D01 (±30 °) SCA100T-D02 (±90 °) Units Measuring range (2 Nominal ±30 ±90 ±0.5 g Measuring direction (3 Mounting plane horizontal Dual axis inclination Dual axis inclination Mounting plane vertical Orthogonal rotation Orthogonal rotation Zero point (4 Mounting position Vdd/2 Vdd/2 V Sensitivity @ room temperature 4(5a 2(5b V/g Offset calibration accuracy (6a, 13 @ room temperature mg Offset temperature dependency (6b, 13 0...70 ° mg -25…85 °C ±10 ±10 mg -40…125 °C ±15 ±15 mg Sensitivity calibration accuracy (7a, 13 @ room temperature ±0.5 ±0.5 Sensitivity temperature error (7b, 13 -40…85 °C -1...1 -1...1 85…125 °C -2.5...1 -2.5...1 Typical non-linearity (8 Over measuring range ±10 mg Cross-axis sensitivity (11 @ room temperature Frequency response –3 dB (LP) (9 @ room temperature 8…28 8…28 Hz Ratiometric error (10 Output noise density (12 From DC...100 Hz µg/ Hz Digital output resolution FS Bits Long term stability (14 @ steady temp 0.25 T.B.D mg VDD = 5.00 V, APPLIES TO BOTH CHANNELS UNLESS OTHERWISE SPECIFIED

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
  • 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 refl ow 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 Rev. 2 / 15 Sept 2005 VTI Technologies reserves the right to modify this specifi cation without prior to notice.

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 ELECTRICAL CONNECTION Acceleration in the direction of the arrow will increase the output voltage. If the SPI interface is not used SCK (pin1), MISO (pin3), MOSI (pin4) and CSB (pin7) must be left fl oating. 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 fl oating or connected to GND. RECOMMENDED CIRCUIT PCB PAD LAYOUTS ABSOLUTE MAXIMUM RATINGS Parameter Value Unit Acceleration (powered or non-powered) 20 000 g Supply voltage -0.3 V to +5.5 V V Voltage at input/output pins -0.3 V to (Vdd+0.3 V) V Temperature range -55…125 Pin# Pin Name I/O Connection SCK Input Serial clock Ext_C_1 Input X axis external capacitor input (Ch 1) MISO Output Master in slave out; data output MOSI Input Master out slave in; data input Out_2 Output Y axis Output (Ch 2) GND Power round (GND) CSB Input Chip select (active low) Ext_C_2 Input Y axis external capacitor input (Ch 2) ST_2 Input Self test input for Y axis (Ch 2) ST_1 / Test_in Input Self test input for X axis (Ch 1 ) Out_1 Output X axis output (Ch 1) VDD Power Positive supply voltage (VDD) SCA100T Series DIMENSIONS