Preliminary SCA1000 and SCA1020 Series Accelerometer FEATURES BENEFITS 2-axis measurement: SCA1000 for X - Y measurement and Excellent reliability and stability over time and SCA1020 for Z - Y measurement temperature Available range 1.7 g High resolution and low noise Interchangeable with SCA610/SCA620 (see interchangeability Wide operating temperature range drawing below) Outstanding overload and shock durability Over damped sensing element to control frequency response SMD DIL-12 lead-free component APPLICATIONS Compatible with lead-free re ow soldering process 2-axis acceleration measurements Advanced internal and external connection failure detection 2-axis platform leveling Digitally activated electrostatic self-test Inclination based position measurement Continuous memory parity check 360 vertical orientation measurement Single +5 V supply two ratiometric analog voltage outputs Serial Peripheral Interface (SPI) compatible digital output (11 bits) Internal temperature sensor, accessible via SPI For customized product, please contact VTI Technologies ELECTRICAL CHARACTERISTICS Parameter Condition Min Typ. Max Units (1 Supply voltage Vdd 4.75 5.0 5.25 V Current consumption Vdd = 5 V No load 5 mA Analog resistive output load Vout to Vdd or Vss 10 kOhm Analog capacitive output load 20 nF Digital output load 500 kHz 1 nF SPI clock frequency 500 kHz AD conversion time 150 s Data transfer time 500 kHz clock 38 s PERFORMANCE CHARACTERISTICS Parameter Condition SCA1000-D01 SCA1020-D02 Units (2 Measuring range Nominal 1.7 1.7 g Measuring direction relative to X= parellel Z= perpendicular See note 12. (12 mounting plane Y =parallel Y= parallel (3,12 Zero point Mounting position Vdd/2 Vdd/2 V (4,12 Sensitivity room temperature 1.2 1.2 V/g (5 Zero point error over temperature -2585 C typical 70 70 mg -40125 C 100 100 mg (6 Sensitivity error over temperature -2585 C typical 3 3% -40125 C 4 4% (7 Typical non-linearity Over measuring range 20 20 mg (10 Cross-axis sensitivity room temperature 3.5 3.5 % (8 Frequency response 3dB -40125 C 5030 Hz 5030 Hz Hz (9 Ratiometric error Vdd = 4.75...5.25 V 2 2 % (11 Output noise density From DC...100 Hz 80 80 g/ Hz Digital output resolution FS 11 11 Bits VDD = 5.00V, UNLESS OTHERWISE SPECIFIED Note 1 100 nF supply by-pass capacitor is needed. 5.00V Vout( Vx) x Note 2 Measuring directions in parallel to mounting plane, arrows showing positive acceleration Vx Note 9 The ratiometric error is speci ed as: RE = 100% x 1- direction. Vout( 5V) Note 3 Zero point speci ed as Voffset = Vout(0 g) V . See note 12. Note 4 Sensitivity speci ed as Vsens = Vout(+1 g) - Vout(-1 g) /2 V/g . See note 12. Note 5 Zero point error speci ed as Zero point error = Vout(0 g) Vdd/2 / Vsens g VSens = Note 10 The cross-axis sensitivity determines how much acceleration, perpendicular to the measuring Nominal sensitivity Vdd/2 = Nominal offset. axis, couples to the output. The total crossaxis sensitivity is the geometric sum of the Note 6 Sensitivity error speci ed as Sensitivity error = Vout(+1 g)-Vout(-1 g) / 2 - Vsens nom / sensitivities of the two axis which are perpendicular to the measuring axis. The angular Vsens nom x 100 % % Vsens nom = nominal sensitivity See note 12. alignment error between channels 1 and 2 is included into the cross axis error. Note 7 From straight line through +1 g and -1 g points. Note 11 Typical gure. In addition, supply voltage noise couples to the output due to the Note 8 The output has true DC (0 Hz) response. ratiometric nature of the accelerometer. Note 12 Measuring directions. Rev. 18 Jan 2005 VTI Technologies reserves the right to modify this speci cation without prior to notice.SCA1000 and SCA1020 Series MEASURING DIRECTIONS SCA1000 ( X - Y Con guration) SCA1020 ( Z - Y Con guration) X: +1 g Position X: 0 g Position X: -1 g Position Z: +1 g Position Z: 0 g Position Z: -1 g Position Y: 0 g Position Y: 0 g Position Y: 0 g Position Y: 0 g Position Y: 0 g Position Y: 0 g Position X: 0 g Position X: 0 g Position X: 0 g Position Z: 0 g Position Z: 0 g Position Z: 0 g Position Y: +1 g Position Y: 0 g Position Y: -1 g Position Y: +1 g Position Y: 0 g Position Y: -1 g Position 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 Storage temperature range -55125 C DIMENSIONS PCB PAD LAYOUTS The accelerometer weighs < 1.2 g. The size of the part is approximately (w x h x l) 9 x 5 x 16 mm. Pin pitch is standard 100 mils. SENSING DIRECTION PART NUMBER SERIAL NUMBER Acceleration in the direction of the arrow will increase the output voltage.