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AN4650 Fiches technique(PDF) 23 Page - STMicroelectronics

No de pièce AN4650
Description  This document is intended to provide usage information
PDF  102 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4650 Fiches technique(HTML) 23 Page - STMicroelectronics

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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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