AN4506 datasheet(19/47 Pages) STMICROELECTRONICS

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AN4506

Digital filters

DocID026442 Rev 2

19/47

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.

Referring to Table 14, three operating modes are possible for the high-pass filter:

800

211

800

110

Table 11. Low-pass filter cutoff frequency

Low_ODR

DR [1:0]

BW [1:0]

ODR [Hz]

Cutoff LPF1

[Hz]

Cutoff LPF2

[Hz]

Table 12. CTRL2 register

EXTRen

LVLen

HPM1

HPM0

HPCF3

HPCF2

HPCF1

HPCF0

Table 13. High-pass filter cut-off frequencies [Hz]

HPCF3-0

ODR [Hz]

12.5

100

200

400

800

0000

0001

0.5

0010

0.2

0.5

0011

0.1

0.2

0.5

0100

0.05

0.1

0.2

0.5

0101

0.02

0.05

0.1

0.2

0.5

0110

0.01

0.02

0.05

0.1

0.2

0.5

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

Table 14. High-pass filter mode configuration

HPM1

HPM0

High-pass filter mode

Normal mode (reset by reading the REFERENCE register)

Reference signal for filtering

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