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| SCA3000-E01 Data Sheet SCA3000-E01 3-AXIS ULTRA LOW POWER ACCELEROMETER WITH DIGITAL SPI INTERFACE Features * * * * * * 2.35 V - 3.6 V supply voltage, 1.7 - 3.6 V digital I/O voltage 3 g measurement range SPI digital interface Selectable frequency response Ultra low power consumption (2.5 V, 120 A typ) 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-E01 is targeted to battery operated wrist and hand-held devices. Typical applications are but not limited * Motion activated functions in mobile terminals and antitheft systems * Gaming input devices * Inclination sensing in digital inclinometers * Tilt compensation in electronic compass * Hard disk protection * Pedometers and activity monitors * * * * * 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 Non-Volatile Memory Motion detector Free fall detector Ring Buffer Control & INT INT Figure 1 SCA3000-E01 Block Diagram VTI Technologies Oy www.vti.fi PRELIMINARY - Subject to changes Doc. Nr. 8255900A.01 1/4 Rev. A.01 SCA3000-E01 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 -3 -40 -1 2.5 1.8 / 2.5 <7 120 120 0.8 1000 0.01 1 3 35 9 9 5 100 50 35 200 35 325 120 60 2.7 2.7 85 Extended supply range 2.7 - 3.6 V Min Typ 2) Max -40 3.3 3.3 <9 150 150 3 100 0.8 1000 1 0.01 1 3 35 9 9 5 93 45 35 200 85 35 325 Units V V C A A A g mg mg/C Count/g % %/C % FS % Hz Hz mg RMS mg RMS Hz Hz ms ms pF kHz Vdd Digital I/O Vdd Reset 3) Active Motion Detection mode Nominal Z-axis +1g position -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 ** Turn on time ** 12) Output load ** SPI clock rate ** * ** 1) 2) 3) 4) 5) 6) 7) 8) 9) 3 40 +1 -40 ... +85 C 42 11 Measurement mode Narrow band measurement mode Measurement mode Narrow band measurement mode Measurement mode Narrow band measurement mode Measurement mode Narrow band measurement mode 28 7 80 40 - 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 x 2+ y 2+ z 2 3g . The measuring range is tested on sensing element level. FS = 3g. 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 y x z 3 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. 8255900A.01 2/4 Rev.A.01 SCA3000-E01 Z X Y Figure 2 Sensing directions and package dimensions in mm with 50 m tolerance. Figure 3 Frequency response of SCA3000-E01 in measurement mode Figure 4 Frequency response of SCA3000-E01 in narrow band measurement mode VTI Technologies Oy www.vti.fi PRELIMINARY - Subject to changes Doc. Nr. 8255900A.01 3/4 Rev.A.01 SCA3000-E01 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. 8255900A.01 4/4 Rev.A.01 |
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