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SCA3000-E05-25 Datasheet(PDF) 8 Page - VTI technologies |
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SCA3000-E05-25 Datasheet(HTML) 8 Page - VTI technologies |
8 / 43 page SCA3000 Series VTI Technologies Oy 8/ 43 www.vti.fi Doc.Nr. 8257300A.07 Rev.A.07 Table 2. Available measurement modes for SCA3000. Available measurement modes SCA3000-D01 SCA3000-D02 SCA3000-E01 SCA3000-E02 SCA3000-E04 SCA3000-E05 Default after power-on or reset Measurement mode Measurement mode Measurement mode Measurement mode Optional measurement mode 1 Bypass measurement mode Narrow band measurement mode Narrow band measurement mode Narrow band measurement mode Optional measurement mode 2 Not available Not available Wide band measurement mode Wide band measurement mode 2.2.1.1 Bypass measurement mode In bypass measurement mode, the signal bandwidth of the SCA3000 is extended by bypassing the low-pass filter in signal channel. As a result of a wider measurement bandwidth, the noise level is higher. 2.2.1.2 Narrow band measurement mode In narrow band measurement mode, the signal bandwidth of the SCA3000 is reduced by increasing low-pass filtering in signal channel. In addition, the output data rate is halved due to decimation. As a result of a narrower signal bandwidth, the noise level is lower. 2.2.1.3 Wide band measurement mode In wide band measurement mode, the SCA3000 signal channel low-pass filtering pass band is widened. As a result of a wider measurement bandwidth, the noise level is higher. 2.2.2 Usage The optional measurement modes can be enabled by setting the bits called MODE_BITS in MODE register to "010" or "001". See section 3.4 for MODE register details. Acceleration data can be read from data output registers X_LSB, X_MSB, Y_LSB, Y_MSB, Z_LSB and Z_MSB in all measurement modes. Each of these registers can be read one by one or using the decrement register read, which is described in section 4.1.3.2 for SPI and 4.2.1.3 for I 2C interface. See section 3.3 for output register details. 2.2.2.1 Overflow condition Since acceleration data registers have no limiter, the possible overflow needs to be detected using bits [B7, B6, B5]. If bits [B7, B6, B5] are ‘011’ or ‘100’, data overflow has occurred (see Table 3). This applies for all acceleration output registers (X_LSB … Z_MSB and BUF_DATA). Table 3. Overflow bit patterns in acceleration data registers (X_LSB … Z_MSB and BUF_DATA). Byte MSB byte LSB byte Bit number Acceleration data bit B7 Sign B6 d11 B5 d10 B4 d9 B3 d8 B2 d7 B1 d6 B0 d5 B7 d4 B6 d3 B5 d2 B4 d1 B3 d0 B2:B0 Data overflow on positive acceleration 0 1 1 x x x x x x x x x x xxx Data overflow on negative acceleration 1 0 0 x x x x x x x x x x xxx x = ignore In case of overflow, the output register value must be discarded. When an overflow is detected, the bit pattern ‘0101 1111 1111 1xxx’ is used for positive accelerations and ‘1010 0000 0000 0xxx’ for |
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