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CMA3000-D01PWB Datasheet(PDF) 9 Page - VTI technologies |
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CMA3000-D01PWB Datasheet(HTML) 9 Page - VTI technologies |
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9 / 35 page  CMA3000-D0X Series VTI Technologies Oy 9/ 35 www.vti.fi Doc.Nr. 8281000.12 Rev. 0.12 Figure 3. The MD band-pass filter's frequency response. Threshold level can be controlled by MDTHR[6:0] bits and the time condition – how long the threshold should be exceeded to trigger – by MDTMR[3:0] bits. ∆T +TL Acceleration exceeds the threshold level due to motion ∆T period of time -TL Acceleration X, Y or Z T1 T2 T3 T4 T5 T6 T7 T8 Time T1 T2 T3 T4 T5 T6 T7 T8 INT output "1" "0" Figure 4. Motion detector operation 2.4.2 Usage The MD mode can be enabled by setting the MODE[2:0] bits in the MODE register to "100". The trigger condition, threshold and duration, can be defined by setting MDTHR and MDFFTMR registers respectively. The device can be configured to switch automatically into 400Hz measurement mode by setting the MDET_EXIT bit in CTRL register. See section 3.3 register and section 2.6 for the interrupt functionality details. In MD mode, band pass filtered acceleration data with 10Hz output data rate is available in registers DOUTX, DOUTY and DOUTZ. |
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