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| SCA620 Series Accelerometer 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-flow 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 ELECTRICAL CHARACTERISTICS Parameter Supply voltage Vdd Current consumption Operating temperature Resistive output load Capacitive load Output noise (1 Vout to Vdd or Vss Vout to Vdd or Vss DC...80 kHz 0.25 Vdd = 5 V; No load - 40 + 20 20 Condition Min. 4.75 Typ. 2.0 Max. 5.25 4.0 125 Units V mA C kOhm nF mg PERFORMANCE CHARACTERISTICS Parameter Measuring range (2 Measuring direction (3 Zero point (nom.) (4 Sensitivity Zero point error (6 Zero point tempco (7 Sensitivity error Sensitivity error (7 Typical non-linearity (7 Cross-axis sensitivity (10 Frequency response Ratiometric error (12 -3 dB point (11 Vdd = 4.75...5.25 V Mounting position @ room temperature -40...125 C -25...85 C -40...125 C -25...85 C Over measuring range Condition/ Comment Nominal SCA620CF8H1A 1.7 Horizontal Vdd/2 1.2 (5 Units g V V/g mg mg/C % % mg % Hz % 125 0.30.6 4 (8 3 (8 40 (9 5 5030 2 VDD = 5.00 V, UNLESS OTHERWISE SPECIFIED Note 1 Note 2 Note 3 Note 4 Note 5a Note 6 Note 7 Note 8 The noise density of CF8H1A is 20 g/ Hz. The measuring range is limited by sensitivity, offset and supply voltage rails of the device. Measuring direction perpendicular to the mounting plane. Vertical versions in +1 g position pins down, horizontal versions leg row 1-4 pointing downwards. Sensitivity specified as [Vout (+1 g) - Vout(-1g)] / 2 [V/g] . Zero point error specified as (Vout (+0 g) - Vdd/2) / Vsens [g] (room temp. error included); Vsens = Nominal sensitivity. Typical tolerance, not 100 % tested. Sensitivity error specified as {{[Vout (+1 g) -Vout (-1 g)] / 2} -Vsens} / Vsens x 100 % [%] (room temp. error included); Vsens = Nominal sensitivity. Note 9 Note 10 Note 11 Note 12 Relative to straight line between 1 g. 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. The output has true DC (0 Hz) response. 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 specified as: RE = 100% x 1- Vout(@Vx) x 5.00V Vx Vout(@5V) Rev. 26 Aug 2004 VTI Technologies reserves the right to modify this specification without prior to notice. SCA620 Series ABSOLUTE MAXIMUM RATINGS Parameter Acceleration (powered or non-powered) Supply voltage Voltage at input / output pins Temperature range Value 20000 -0.3 to +7.0 -0.3 to Vdd + 0.3 -55 to + 125 Units g V V C ELECTRICAL CONNECTION RECOMMENDED CIRCUIT Pin# 1 2 3 4 5 6 7 8 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 ST VOUT VDD Negative supply voltage (VSS) Open or capacitively connected to GND for EMC*) Self-test control Sensor analog output Positive supply voltage (VDD) *) recommended capacity min. 20 pF - Effectiveness should be tested and if necessary adapted in the respective connection. DIMENSIONS 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. PCB PAD LAYOUTS + 10.48 8 7 6 5 VTI PART 5.08 SENSING DIRECTION 8.38 SCA620 1 2 3 4 PART NUMBER SERIAL NUMBER 11.31 3.03 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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