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Giải thích chi tiết về linh kiện  This document provides application information for the low-voltage 3-axis digital output
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AN2847
High pass filter
Doc ID 15136 Rev 2
17/31
4
High pass filter
The LIS331DLH provides embedded high-pass filtering capability to easily remove the DC
component of the measured acceleration. As shown in
Figure 5, it is possible to
independently apply the filter on the output data and/or on the interrupts data through the
FDS, HPen1 and HPen2 bits of the CTRL_REG2 register configuration. This means that it is
possible, for example, to obtain filtered data while interrupt generation works on unfiltered
data.
Figure 5.
High pass filter connections block diagram
4.1
Filter configuration
As shown in
Table 12, two operating modes are possible for the high-pass filter:
:
The bandwidth of the high-pass filter depends on the selected ODR and on the settings of
the HPCFx bits of CTRL_REG2. The high-pass filter cut-off frequencies (ft) are shown in
Table 13.
Table 12.
High-pass filter mode configuration
HPM1
HPM0
0
0
Normal mode (reset reading HP_RESET_FILTER)
0
1
Reference mode
1
0
Same as configuration 00h
1
1
Not allowed



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