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| SCA3000-D01 Data Sheet SCA3000-D01 3-AXIS LOW POWER ACCELEROMETER WITH DIGITAL SPI INTERFACE Features * 2.35 V - 3.6 V supply voltage, 1.7 V - 3.6 V digital I/O voltage * 2 g measurement range * SPI digital interface * Selectable frequency response * Very low current consumption (2.5 V, 480 A typ) * Temperature output * 64 samples/axis buffer memory for output acceleration data and advanced features enable significant power and resource savings at system level * Interrupt signal triggered by motion and free fall * Size 7x7x1.8 mm * Proven capacitive 3D-MEMS technology * High shock durability * RoHS compliant / lead free soldering Applications SCA3000-D01 is targeted to battery operated devices. Typical applications are but not limited * Motion activated functions in mobile terminals and antitheft systems * Inertial navigation * Inclination sensing in digital inclinometers * Tilt compensation in electronic compass C/V Analog calibration & ADC DEMUX 1:3 Low-pass Filter Low-pass Filter Low-pass Filter Decimation Decimation Coordinate Mapping and Calibration SCK SPI i/f MISO MOSI CSB Decimation Oscillator & clock Reference NonVolatile Memory Temperature sensor Motion detector Free fall detector Ring Buffer Control & INT INT Figure 1 SCA3000-D01 Block Diagram VTI Technologies Oy www.vti.fi PRELIMINARY - Subject to changes Doc.nr. 8255700A.01 1/4 Rev.A.01 SCA3000-D01 Performance Characteristics 1) Parameter Analog and digital Vdd Digital I/O Vdd Operating temperature ** Current consumption * Condition Typical supply range 2.35 - 2.7 V Min Typ 2) Max 2.35 1.7 -40 -2 -20 -1 36 56 200 2.5 1.8 / 2.5 <7 480 300 0.5 1333 0.01 1 3 45 70 3 5 250 256 1.8 35 35 300 2.7 2.7 85 Extended supply range 2.7 - 3.6 V Min Typ 2) Max -40 3.3 3.3 <9 650 400 2 50 0.5 1333 1 0.01 1 3 45 70 3 5 260 256 1.8 35 35 85 35 1.6 Units V V C A A A g mg mg/C Count/g % %/C % FS % Hz Hz mg RMS mg RMS Hz Count Count/C ms ms pF MHz Vdd Digital I/O Vdd Reset 3) Active Motion Detection mode Nominal Z-axis +1g position -40 ... +85 C -40 ... +85 C Acceleration range * 4) Offset calibration error * Offset temperature error ** 5) Sensitivity * 6) Sensitivity calibration error * Sensitivity temperature error ** 7) Non-Linearity ** 8) Cross-Axis sensitivity ** 9) Bandwidth ** 10) Noise ** 11) Output data rate ** Temperature output Turn on time ** 12) Output load ** SPI clock rate ** * ** 1) 2) 3) 4) 5) 6) 7) 8) 9) 2 20 +1 Measurement mode Bypass measurement mode Measurement mode Bypass measurement mode T=+23 C Sensitivity Measurement mode Bypass measurement mode 54 84 - 35 1.6 100% tested in production Qualified during product validation The product is factory calibrated at 2.5 V in room temperature. Typical values are not guaranteed. Includes the current through the internal 400 k pull-up resistor connected to digital I/O Vdd. Range defined as x2+ y 2+ z 2 2 g . The measuring range is tested on sensing element level. FS = 2g. Offset temperature error = {Count(0g)-Offset} / Sensitivity [ g ]. Sensitivity = Calibrated sensitivity. Offset= Calibrated offset. Sensitivity = {Count(+1g) - Count(-1g)}/2 [Count/g]. Sensitivity temperature error = {[Count(+1g)-Count(-1g)]/2 - Sensitivity} / Sensitivity x 100% [%]. Sensitivity = Calibrated sensitivity. From straight line through sensitivity calibration (+1g, -1g) points. 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 angular alignment error between X, Y and Z axis is included into the cross axis sensitivity. Frequency responses according to Figure 3 and Figure 4. Average noise/axis over the measurement bandwidth defined as 1 (n 2 + n 2 + n 2 ) , where nx, ny and nz are 3 x y z 10) 11) 12) the measured signal's standard deviation due to noise in x, y and z directions. Settling error less than 1% of FS. VTI Technologies Oy www.vti.fi PRELIMINARY- Subject to changes Doc. Nr. 8255700A.01 2/4 Rev.A.01 SCA3000-D01 Z X Y Figure 2 Sensing directions and package dimensions in mm with 50 m tolerance. Figure 3 Frequency response of SCA3000-D01 in measurement mode Figure 4 Frequency response of SCA3000-D01 in bypass measurement mode VTI Technologies Oy www.vti.fi PRELIMINARY- Subject to changes Doc. Nr. 8255700A.01 3/4 Rev.A.01 SCA3000-D01 Figure 5 Application schematic Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Name NC XRESET INT CLK DVSS DVDD DVIO CSB NC NC SCK_SCL MISO_SDA MOSI AVDD AVSS AVSS ATSTIO NC Function Not connected External reset, active low Interrupt output Digital ground Digital ground Digital supply Digital I/O supply Chip select Not connected Not connected SPI serial clock (SCK) SPI data out (MISO) SPI data in (MOSI) Analog supply Analog ground Analog ground Not connected Not connected Table 1 Pin descriptions Document Change Control Rev. A A.01 Date 21-Apr-06 13-Jun-06 Change Description 1st official release Dimensions updated VTI Technologies Oy www.vti.fi PRELIMINARY- Subject to changes Doc. Nr. 8255700A.01 4/4 Rev.A.01 |
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