AN4506 datasheet(17/47 Pages) STMICROELECTRONICS

Part #	AN4506

Description	This document is intended to provide information

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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AN4506

Digital filters

DocID026442 Rev 2

17/47

Figure 7. Low-pass/high-pass filter connections block diagram

4.1

Filter configuration

Referring to Table 9, the HPen and Out_sel bits are used to drive unfiltered or filtered data to

the output registers and to the FIFO:

Referring to Table 10, the HPen and IG_Sel bits are used to drive unfiltered or filtered data

to the interrupt generator circuitry:

Table 9. Out_Sel configuration setting

HPen

Out_Sel1

Out_Sel0

Description

Data in DataReg and FIFO are non high-pass

filtered

Data in DataReg and FIFO are high-pass

filtered

Data in DataReg and FIFO are low-pass

filtered by LPF2

Data in DataReg and FIFO are high-pass and

low-pass filtered by LPF2

Table 10. IG_SEL configuration settings

HPen

IG_Sel1

IG_Sel2

Description

Non-high-pass-filtered data are used for

interrupt generation

High-pass-filtered data are used for interrupt

generation

AN4506 Datasheet(PDF) 17 Page - STMicroelectronics