SCA620 VTI | Alldatasheet

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Rev. 26 Aug 2004 VTI Technologies reserves the right to modify this specifi cation without prior to notice. Vout(@Vx) x RE = 100% x Vout(@5V) 5.00V Vx SCA620 Series

FEATURES

  • Available ranges ±1.7 g
  • 8-pin plastic surface mount DIP package mountable with pick and place machines
  • Enhanced failure detection
  • Digitally activated electrostatic self test
  • Calibration memory parity check
  • Continuous connection failure detection
  • Bi-directional acceleration measurement
  • Controlled frequency response in the sensing element
  • Re-fl ow solderable, process compatible
  • Single +5 V supply; ratiometric voltage output in the range 4.75 … 5.25 V BENEFITS
  • Exceptional reliability, unprecedented accuracy and excellent stability over temperature and time
  • Outstanding overload and shock durability
  • No additional components required

APPLICATIONS

  • Acceleration measurement
  • Inclination measurement
  • Motion measurement
  • Vibration measurement For customised product please contact VTI Technologies Accelerometer

ELECTRICAL CHARACTERISTICS

Min. Typ. Max. Units Supply voltage Vdd 4.75 5.25 V Current consumption Vdd = 5 V; No load 2.0 4.0 mA Operating temperature - 40 + 125 Resistive output load Vout to Vdd or Vss kOhm Capacitive load Vout to Vdd or Vss nF Output noise (1 DC...80 kHz 0.25 mg PERFORMANCE CHARACTERISTICS Parameter Condition/ Comment SCA620- CF8H1A Units Measuring range (2 Nominal ±1.7 g Measuring direction (3 Horizontal Zero point (nom.) (4 Mounting position Vdd/2 V Sensitivity @ room temperature 1.2 (5 V/g Zero point error (6 -40...125 °C ±125 mg Zero point tempco (7 -25...85 °C 0.3±0.6 mg/°C Sensitivity error -40...125 °C ±4 (8 Sensitivity error (7 -25...85 °C ±3 (8 Typical non-linearity (7 Over measuring range ±40 (9 mg Cross-axis sensitivity (10 Frequency response -3 dB point (11 50±30 Hz Ratiometric error (12 VDD = 5.00 V, UNLESS OTHERWISE SPECIFIED Note 1 The noise density of CF8H1A is 20 µg/ Hz. Note 2 The measuring range is limited by sensitivity, offset and supply voltage rails of the device. Note 3 Measuring direction perpendicular to the mounting plane. Note 4 Vertical versions in +1 g position pins down, horizontal versions leg row 1-4 pointing downwards. Note 5a Sensitivity specifi ed as [Vout (+1 g) - Vout(-1g)] / 2 [V/g] . Note 6 Zero point error specifi ed as (Vout (+0 g) - Vdd/2) / Vsens [g] (room temp. error included); Vsens = Nominal sensitivity. Note 7 Typical tolerance, not 100 % tested. Note 8 Sensitivity error specifi ed as {{[Vout (+1 g) -Vout (-1 g)] / 2} -Vsens} / Vsens x 100 % [%] (room temp. error included); Vsens = Nominal sensitivity. Note 9 Relative to straight line between ±1 g. Note 10 The cross-axis sensitivity determines how much 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 axes, which are perpendicular to the measuring axis. Note 11 The output has true DC (0 Hz) response. Note 12 Supply voltage noise also couples to the output, due to the ratiometric (output proportional to supply voltage) nature of the accelerometer. The ratiometric error is specifi ed as:

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 Acceleration in the direction of the arrow will increase the output voltage. ELECTRICAL CONNECTION DIMENSIONS RECOMMENDED CIRCUIT PCB PAD LAYOUTS ABSOLUTE MAXIMUM RATINGS Parameter Value Units Acceleration (powered or non-powered) 20000 g Supply voltage -0.3 to +7.0 V Voltage at input / output pins -0.3 to Vdd + 0.3 V Temperature range -55 to + 125 ºC Pin# Pin Name Connection Open or capacitively connected to GND for EMC*) Open or capacitively connected to GND for EMC*) Open or capacitively connected to GND for EMC*) GND Negative supply voltage (VSS) Open or capacitively connected to GND for EMC*) ST Self-test control VOUT Sensor analog output VDD Positive supply voltage (VDD) *) recommended capacity min. 20 pF – Effectiveness should be tested and if necessary adapted in the respective connection. The accelerometer weighs under 1 g. The size of the part is approximately (w x h x l) 9 x 5 x 11 mm. Pin pitch is standard 100 mils. SCA620 Series SENSING DIRECTION 10.48 5.08 3.03 8.38 11.31 VTI PART SCA620 SERIAL NUMBER PART NUMBER