AN4506 Просмотр технического описания (PDF) - STMicroelectronics
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AN4506 Datasheet PDF : 47 Pages
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AN4506
Digital filters
Low_ODR
0
0
0
0
Table 11. Low-pass filter cutoff frequency
DR [1:0]
BW [1:0]
ODR [Hz]
Cutoff LPF1
[Hz]
11
00
800
11
01
800
211
11
10
800
11
11
800
Cutoff LPF2
[Hz]
30
35
-
110
4.3
High-pass filter
The bandwidth of the high-pass filter depends on the selected ODR and on the settings of
the HPCFx bits of the CTRL2 register. The high-pass filter cut-off frequencies (ft) are shown
in Table 13.
EXTRen LVLen
Table 12. CTRL2 register
HPM1
HPM0 HPCF3 HPCF2
HPCF1
HPCF0
Table 13. High-pass filter cut-off frequencies [Hz]
HPCF3-0
12.5
25
ODR [Hz]
50
100
200
400
800
0000
1
2
4
8
15
30
56
0001
0.5
1
2
4
8
15
30
0010
0.2
0.5
1
2
4
8
15
0011
0.1
0.2
0.5
1
2
4
8
0100
0.05
0.1
0.2
0.5
1
2
4
0101
0.02
0.05
0.1
0.2
0.5
1
2
0110
0.01
0.02
0.05
0.1
0.2
0.5
1
0111
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1000
0.002
0.005
0.01
0.02
0.05
0.1
0.2
1001
0.001
0.002
0.005
0.01
0.02
0.05
0.1
Referring to Table 14, three operating modes are possible for the high-pass filter:
HPM1
0
0
Table 14. High-pass filter mode configuration
HPM0
High-pass filter mode
0
Normal mode (reset by reading the REFERENCE register)
1
Reference signal for filtering
DocID026442 Rev 2
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