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AN4650 데이터시트(PDF) 23 Page - STMicroelectronics |
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AN4650 데이터시트(HTML) 23 Page - STMicroelectronics |
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23 / 102 page ![]() DocID027415 Rev 1 23/102 AN4650 Operating modes 102 2.6.1 Accelerometer slope filter As shown in Figure 2, the LSM6DS3 device embeds a digital slope filter which is used for activity/inactivity and single/double-tap features; it can also be used for wake-up detection when the SLOPE_FDS bit of the TAP_CFG register is set to 0. The slope filter output data is computed using the following formula: slope(tn) = [ acc(tn) - acc(tn-1) ] / 2 An example of a slope data signal is illustrated in Figure 3. Figure 3. Accelerometer slope filter Table 10. Accelerometer LPF2 cutoff frequency HPCF_XL[1:0] LPF2 digital filter cutoff frequency [Hz] 00 ODR_XL / 50 01 ODR_XL / 100 10 ODR_XL / 9 11 ODR_XL / 400 |
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