SCA3000-E04 Data Sheet SCA3000-E04 3-AXIS ULTRA LOW POWER ACCELEROMETER WITH DIGITAL SPI INTERFACE Applications Features SCA3000-E04 is targeted to battery operated • 2.35 V – 3.6 V supply voltage, wrist and hand-held devices. Typical 1.7 – 3.6 V digital I/O voltage applications are but not limited • ±6 g measurement range • Motion activated functions in mobile • SPI digital interface terminals and antitheft systems • Selectable frequency response • Pedometers and activity monitors • Ultra low power consumption (2.5 V, 120 µA 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 SCK Low-pass Decimation Coordinate Analog Filter Mapping MISO C/V calibration DE- and SPI & MUX Calibration i/f Low-pass Decimation ADC 1:3 MOSI Filter CSB Low-pass Decimation Filter INT Oscillator Reference Non-Volatile Motion Free fall Ring Control & Memory detector detector Buffer & clock INT Figure 1 SCA3000-E04 Block Diagram VTI Technologies Oy PRELIMINARY - Subject to changes 1/4 www.vti.fi Doc. Nr. 8290500A Rev. A SCA3000-E04 1) Performance Characteristics Parameter Condition Typical supply range Extended supply Units 2.35 – 2.7 V range 2.7 – 3.6 V 2) 2) Min Typ Max Min Typ Max Analog and digital Vdd 2.35 2.5 2.7 - 3.3 - V Digital I/O Vdd Vdd ≥ Digital I/O Vdd 1.7 1.8 / 2.5 2.7 - 3.3 - V Operating temperature ** -40 - 85 -40 - 85 °C Current consumption * Reset 3) - <7 - <9 - µA Active - 120 - 150 - µA Motion Detection - 120 - 150 - µA mode 4) Acceleration range * Nominal -6 - 6 - ± 6 - g Offset calibration error * Z-axis +1g position -80 - 80 - ± 200 - mg 5) Offset temperature error ** -40 ... +85 °C - ±1.6 - ±1.6 - mg/°C 6) Sensitivity * - 500 - - 500 - Count/g Sensitivity calibration error * -1 - +1 - ± 1 - % Sensitivity temperature error -40 ... +85 °C - ±0.01 - ±0.01 - %/°C 7) ** 8) Non-Linearity ** - ±0.5 - ±0.5 - % FS 9) Cross-Axis sensitivity ** - ±4 - - ±4 - % 10) Bandwidth ** Measurement mode 30 38 46 - 38 - Hz Narrow band 7 9 11 - 9 - Hz measurement mode 11) Noise ** Measurement mode - 18 - 18 - mg RMS Narrow band - 10 - 10 - mg RMS measurement mode Output data rate ** Measurement mode 80 100 120 - 93 - Hz Narrow band 40 50 60 - 45 - Hz measurement mode 12) Turn on time ** Measurement mode - 35 - 35 - ms Narrow band - 200 - 200 - ms measurement mode Output load ** - - 35 - - 35 pF SPI clock rate ** - - 325 - - 325 kHz * 100% tested in production ** Qualified during product validation 1) The product is factory calibrated at 2.5 V in room temperature. 2) Typical values are not guaranteed. 3) Includes the current through the internal 400 kΩ pull-up resistor connected to digital I/O Vdd. 4) 2 2 2 Range defined as . The measuring range is tested on sensing element level. FS = 6g. +y + ≤6g x z 5) Offset temperature error = {Count(0g)-Offset} / Sensitivity [ g ]. Sensitivity = Calibrated sensitivity. Offset= Calibrated offset. 6) Sensitivity = {Count(+1g) - Count(-1g)}/2 [Count/g]. 7) Sensitivity temperature error = {[Count(+1g)-Count(-1g)]/2 - Sensitivity} / Sensitivity x 100% [%]. Sensitivity = Calibrated sensitivity. 8) Best fit straight line. 9) 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. 10) Frequency responses according to Figure 3 and Figure 4. 11) 1 2 Average noise/axis over the measurement bandwidth defined as 2 2 , where nx, ny and nz are n (n + +n ) y x z 3 the measured signal's standard deviation due to noise in x, y and z directions. 12) Settling error less than 1% of FS. VTI Technologies Oy PRELIMINARY - Subject to changes 2/4 www.vti.fi Doc. Nr. 8290500A Rev.A SCA3000-E04 Z X Y Figure 2 Sensing directions and package dimensions in mm with ±50 µm tolerance. Figure 3 Frequency response of SCA3000-E04 in Figure 4 Frequency response of SCA3000-E04 in measurement mode narrow band measurement mode VTI Technologies Oy PRELIMINARY - Subject to changes 3/4 www.vti.fi Doc. Nr. 8290500A Rev.A SCA3000-E04 Figure 5 Application schematic Pin # Name Function 1 NC Not connected 2 XRESET External reset, active low 3 INT Interrupt output 4 CLK Digital ground 5 DVSS Digital ground 6 DVDD Digital supply 7 DVIO Digital I/O supply 8 CSB Chip select 9 NC Not connected 10 NC Not connected 11 SCK_SCL SPI serial clock (SCK) 12 MISO_SDA SPI data out (MISO) 13 MOSI SPI data in (MOSI) 14 AVDD Analog supply 15 AVSS Analog ground 16 AVSS Analog ground 17 ATSTIO Not connected 18 NC Not connected Table 1 Pin descriptions Document Change Control Rev. Date Change Description 0.3 21-Apr-06 New template 0.4 13-Jun-06 Dimensions updated 0.5 01-Sep-06 Bandwidth in measurement mode, definition and value of non-linearity, cross axis sensitivity updated Figures 3 and 4 updated A 15-Sep-06 First official release. Typos corrected. VTI Technologies Oy PRELIMINARY - Subject to changes 4/4 www.vti.fi Doc. Nr. 8290500A Rev.A