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AN4504 Datasheet(PDF) 14 Page - STMicroelectronics

Part # AN4504
Description  This document is intended to provide usage information
PDF  41 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4504 Datasheet(HTML) 14 Page - STMicroelectronics

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Digital filters
AN4504
14/41
DocID026419 Rev 1
Referring to Table 9, the HPen and INT1_Sel bits are used to drive unfiltered or filtered data
to the interrupt generator circuitry.
4.2
Low-pass filters
The bandwidth of the low-pass filters depends on the selected ODR. The cutoff frequencies
(ft) of the low-pass filters are shown in Table 12.
Table 9. HPen and INT1_Sel settings
HPen
INT1_Sel1
INT1_Sel0
Description
x0
0
Non high-pass filtered data are used for the
interrupt generator
x0
1
High-pass filtered data are used for the
interrupt generator
01
x
Low-pass filtered data are used for the
interrupt generator
11
x
High-pass and low-pass filtered data are
used for the interrupt generator
Table 10. Low-pass filters cutoff frequency
DR [1:0]
BW [1:0]
ODR [Hz]
Cutoff LPF1 [Hz]
Cutoff LPF2 [Hz]
00
00
100
32
12.5
00
01
100
25
00
10
100
25
00
11
100
25
01
00
200
54
12.5
01
01
200
25
01
10
200
50
01
11
200
70
10
00
400
78
20
10
01
400
25
10
10
400
50
10
11
400
110
11
00
800
93
30
11
01
800
35
11
10
800
50
1
11
800
110



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