AN4504 datasheet(14/41 Pages) STMICROELECTRONICS

Il numero della parte	AN4504

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14 / 41 page

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

Non high-pass filtered data are used for the

interrupt generator

High-pass filtered data are used for the

interrupt generator

Low-pass filtered data are used for the

interrupt generator

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]

100

12.5

100

200

12.5

200

400

110

800

110

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