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SCA3000-D01-25 Datasheet(PDF) 11 Page - VTI technologies |
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SCA3000-D01-25 Datasheet(HTML) 11 Page - VTI technologies |
11 / 43 page SCA3000 Series VTI Technologies Oy 11/ 43 www.vti.fi Doc.Nr. 8257300A.07 Rev.A.07 7. Acceleration data is not available when the SCA3000 is in motion detection mode 8. The INT-pin is activated when motion is detected in the X- or Y-axis direction (Z-axis direction is ignored), see section 2.7 for detailed INT-pin information. 2.4 Free-Fall Detection 2.4.1 Description During free-fall in the gravitation field, all 3 orthogonal acceleration components are ideally equal to zero. Due to practical non-idealities, detection must be done using Threshold Level (TL) greater than 0. When enabled, the Free-Fall Detection (FFD) will monitor 8 MSB's of the measured acceleration in the X, Y and Z directions. If the measured acceleration stays within the TL longer than time TFF (Figure 4 below), which corresponds approx 25 cm drop distance, the FFD will generate an interrupt to the INT-pin. T1 T2 T3 T4 T5 T6 T7 T8 +TL TFF -TL Acceleration X, Y and Z Time T1 T2 T3 T4 T5 T6 T7 T8 Time INT output "1" "0" Figure 4. Free Fall condition. 2.4.2 Usage Free-fall detection can be enabled by setting FFD_EN bit in MODE register to "1". See section 3.4 for MODE register details. Acceleration data is available in registers X_LSB, X_MSB, Y_LSB, Y_MSB, Z_LSB, Z_MSB and BUF_DATA as in measurement mode. See section 3.3 for output register and section 2.7 for interrupt functionality details. 2.4.3 Example A simple example of free-fall detection usage: 1. Write "00010000" (10h) into the MODE register (enable free fall detection, FFD_EN = '1') 2. Acceleration data can be read normally 3. INT-pin is activated when free fall is detected, see section 2.7 for detailed INT-pin information. |
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