AN4650 datasheet(22/102 Pages) STMICROELECTRONICS

номер детали	AN4650

подробное описание детали	This document is intended to provide usage information

PDF	102 Pages

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производитель	STMICROELECTRONICS [STMicroelectronics]

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Operating modes

AN4650

22/102

DocID027415 Rev 1

Figure 2. Accelerometer composite digital filter

The bits LPF2_XL_EN, HP_SLOPE_XL_EN and HPCF_XL [1:0] of CTRL8_XL are used to

select the filter applied to the accelerometer output data and to the FIFO data:



if both the LPF2_XL_EN bit and the HP_SLOPE_XL_EN bit are set to 0, no filter is

applied;



if the LPF2_XL_EN bit is set to 1, the LP digital filter is applied, regardless of the

HP_SLOPE_XL_EN bit configuration;



if the LPF2_XL_EN bit is set to 0 and the HP_SLOPE_XL_EN bit is set to 1, the applied

filter depends on the configuration of the HPCF_XL [1:0] bits, as shown in Table 9.

The HPCF_XL [1:0] bits of CTRL8_XL are also used to select the cutoff frequency of the

LPF2 filter, as shown in Table 10. This low-pass filter can also be used in the 6D/4D

functionality by setting the LOW_PASS_ON_6D bit of CTRL8_XL register to 1.

Table 9. Accelerometer slope and high-pass filter selection and cutoff frequency

HPCF_XL[1:0]

Applied filter

HP digital filter

cutoff frequency [Hz]

Slope

ODR_XL / 4

High-Pass

ODR_XL / 100

High-Pass

ODR_XL / 9

High-Pass

ODR_XL / 400

AN4650 датащи(PDF) 22 Page - STMicroelectronics