SCA620 Series Accelerometer FEATURES BENEFITS • Available ranges ±1.7 g • Exceptional reliability, unprecedented accuracy and • 8-pin plastic surface mount DIP package mountable excellent stability over temperature and time with pick and place machines • Outstanding overload and shock durability • Enhanced failure detection • No additional components required • Digitally activated electrostatic self test • Calibration memory parity check APPLICATIONS • Continuous connection failure detection • Acceleration measurement • Bi-directional acceleration measurement • Inclination measurement • Controlled frequency response in the sensing element • Motion measurement • Re-fl ow solderable, process compatible • Vibration measurement • Single +5 V supply; ratiometric voltage output in the For customised product please contact range 4.75 … 5.25 V VTI Technologies ELECTRICAL CHARACTERISTICS Parameter Condition 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 °C Resistive output load Vout to Vdd or Vss 20 kOhm Capacitive load Vout to Vdd or Vss 20 nF (1 Output noise DC...80 kHz 0.25 mg PERFORMANCE CHARACTERISTICS Condition/ SCA620- Parameter Units Comment CF8H1A (2 Measuring range Nominal ±1.7 g (3 Measuring direction Horizontal (4 Zero point (nom.) Mounting position Vdd/2 V (5 Sensitivity @ room temperature 1.2 V/g (6 Zero point error -40...125 °C ±125 mg (7 Zero point tempco -25...85 °C 0.3±0.6 mg/°C (8 Sensitivity error -40...125 °C ±4 % (7 (8 Sensitivity error -25...85 °C % ±3 (7 (9 Typical non-linearity Over measuring range ±40 mg (10 Cross-axis sensitivity 5% (11 Frequency response -3 dB point 50±30 Hz (12 Ratiometric error Vdd = 4.75...5.25 V 2 % VDD = 5.00 V, UNLESS OTHERWISE SPECIFIED Note 1 The noise density of CF8H1A is 20 µg/ Hz. Note 9 Relative to straight line between ±1 g. Note 2 The measuring range is limited by sensitivity, offset and supply voltage rails of the device. Note 10 The cross-axis sensitivity determines how much acceleration, perpendicular to the Note 3 Measuring direction perpendicular to the mounting plane. measuring axis, couples to the output. The total cross-axis sensitivity is the geometric sum Note 4 Vertical versions in +1 g position pins down, horizontal versions leg row 1-4 pointing downwards. of the sensitivities of the two axes, which are perpendicular to the measuring axis. Note 5a Sensitivity specifi ed as [Vout (+1 g) - Vout(-1g)] / 2 [V/g] . Note 11 The output has true DC (0 Hz) response. Note 6 Zero point error specifi ed as (Vout (+0 g) - Vdd/2) / Vsens [g] (room temp. error included); Note 12 Supply voltage noise also couples to the output, due to the ratiometric (output proportional Vsens = Nominal sensitivity. to supply voltage) nature of the accelerometer. Note 7 Typical tolerance, not 100 % tested. 5.00V Note 8 Sensitivity error specifi ed as {{[Vout (+1 g) -Vout (-1 g)] / 2} -Vsens} / Vsens x 100 % [%] (room Vout(@Vx) x Vx temp. error included); Vsens = Nominal sensitivity. The ratiometric error is specifi ed as: RE = 100% x 1- Vout(@5V) Rev. 26 Aug 2004 VTI Technologies reserves the right to modify this specifi cation without prior to notice. SCA620 Series 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 ELECTRICAL CONNECTION RECOMMENDED CIRCUIT Pin# Pin Name Connection 1 Open or capacitively connected to GND for EMC*) 2 Open or capacitively connected to GND for EMC*) 3 Open or capacitively connected to GND for EMC*) 4 GND Negative supply voltage (VSS) 5 Open or capacitively connected to GND for EMC*) 6 ST Self-test control 7 VOUT Sensor analog output 8 VDD Positive supply voltage (VDD) *) recommended capacity min. 20 pF – Effectiveness should be tested and if necessary adapted in the respective connection. DIMENSIONS PCB PAD LAYOUTS 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. + 10.48 VTI PART 5.08 8 7 6 5 SENSING DIRECTION SCA620 1 2 3 4 PART NUMBER 3.03 SERIAL NUMBER Acceleration in the direction of the arrow will increase the output voltage. VTI Technologies Oy VTI Technologies Oy VTI Technologies, Inc. Myllynkivenkuja 6 Frankfurt Branch One Park Lane Blvd. P.O. Box 27 Rennbahnstr. 72-74 Suite 804 - East Tower FI-01621 Vantaa D-60528 Frankfurt am Main Dearborn, MI 48126 Finland Germany USA Tel. +358 9 879 181 Tel. +49 69 6786 880 Tel. +1 313 425 0850 Fax +358 9 879 18791 Fax +49 69 6786 8829 Fax +1 313 425 0860 sales@vti.fi sales.de@vti.fi sales@vtitechnologies.com 8.38 11.31