LPS25H datasheet(40/45 Pages) STMICROELECTRONICS

40 / 45 page

Hardware digital filter

LPS25H

40/45

DocID023722 Rev 5

Hardware digital filter

An embedded digital filter is activated by selecting the FIFO_MEAN_MODE and

WTM_POINT (FIFO_CTRL(2Eh)) and activating the FIFO_EN.

The digital filter reduces the pressure noise level to 0.010 hPa rms (1pa at 1 sigma) and

allows to reduce the internal ADC HW average reducing the power consumption keeping

the same pressure noise level.

Figure 13. Hardware digital filter

9.1

Filter enabling and suggested configuration

To reduce the internal pressure and temperature average the configuration below can be

used:

RES_CONF (10h) = 05h

FIFO_CTRL (2Eh) = C0

CTRL_REG2 (21h) = 40h

In this way, the power consumption at 1 Hz is reduced from 25 µA (typical) to 4.5 µA (typical)

with a pressure noise of 0.01 hPa rms

Te m peratu re

Se n so r

AF E

ADC

Qu a d ra tic

Te m p eratu re

co m p e n sa tio n

A verage

1H z

FIFO _M EN _D EC

FIFO M O D E

FIFO _EN

PR ESS_O U T _XL

PR ESS_O U T _L

PR ESS_O U T _H

Voltage

R ef erenc e

A n alo g b lo cks

Te m p e ratu re

co m p e ns atio n

C om pensation

C oeffic ients

Memory

Em b e d de d

filte r

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