AN3308 datasheet(15/52 Pages) STMICROELECTRONICS

Part #	AN3308

Description	This document describes the low-voltage 3-axis digital output linear MEMS accelerometer provided in an LGA package

PDF	52 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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15 / 52 page

AN3308

High-pass filter

Doc ID 18198 Rev 1

15/52

High-pass filter

The LIS3DH provides an embedded high-pass filtering capability to easily delete the DC

component of the measured acceleration. As shown in Figure 2, through FDS, HPen1, and

HPen2 bits of CTRL_REG2 configuration, it is possible to independently apply the filter on

the output data and/or on the interrupts data. This means that it is possible, i.e., to get

filtered data while interrupt generation works on unfiltered data.

Figure 2.

High-pass filter connections block diagram

4.1

Filter configuration

Referring to Table 7, two operating modes are possible for the 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 cut-off frequencies (ft) are shown in

Table 8.

Table 7.

High-pass filter mode configuration

HPM1

HPM0

High-pass filter mode

Normal mode (reset reading HP_RESET_FILTER)

Reference signal for filtering

Normal mode

Autoreset on interrupt event

AN3308 Datasheet(PDF) 15 Page - STMicroelectronics