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AN4505 Datasheet(PDF) 17 Page - STMicroelectronics

Part # AN4505
Description  This document is intended to provide usage information
PDF  43 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4505 Datasheet(HTML) 17 Page - STMicroelectronics

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AN4505
Digital filters
43
4.3
High-pass filter
The bandwidth of the high-pass filter depends on the selected ODR and on the settings of
HPCFx bits of CTRL_REG2. The high-pass filter cutoff frequencies (ft) are shown in
Table 13.
Referring to Table 14, three operating modes are possible for the high-pass filter.
Table 12. CTRL_REG2 register
0(1)
1. Value loaded at boot. This value must not be changed
0(1)
HPM1
HPM0
HPCF3
HPCF2
HPCF1
HPCF0
Table 13. High-pass filter cutoff frequency [Hz]
HPCF[3:0]
ODR [Hz]
95
190
380
760
0000
8
15
30
56
0001
4
8
15
30
0010
2
4
8
15
0011
1
2
4
8
0100
0.5
1
2
4
0101
0.2
0.5
1
2
0110
0.1
0.2
0.5
1
0111
0.05
0.1
0.2
0.5
1000
0.02
0.05
0.1
0.2
1001
0.01
0.02
0.05
0.1
Table 14. High-pass filter mode configuration
HPM1
HPM0
High-pass filter mode
0
0
Normal mode (reset by reading the REFERENCE register)
0
1
Reference signal for filtering
1
0
Normal mode (reset by reading the REFERENCE register)
1
1
Autoreset on interrupt event



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