LPS25H datasheet(26/45 Pages) STMICROELECTRONICS

26 / 45 page

LPS25H

26/45

DocID023722 Rev 5

DIFF_EN bit is used to enable the circuitry for the computing of differential pressure output.

In default mode (DIFF_EN=’0’) the circuitry is turned off. It is suggested to turn on the

circuitry only after the configuration of REF_P_x and THS_P_x.

BDU bit is used to inhibit the output registers update between the reading of upper and

lower register parts. In default mode (BDU = ‘0’), the lower and upper register parts are

updated continuously. If it is not sure to read faster than output data rate, it is recommended

to set BDU bit to ‘1’. In this way, after the reading of the lower (upper) register part, the

content of that output registers is not updated until the upper (lower) part is read too.

This feature avoids reading LSB and MSB related to different samples.

RESET_AZ bit is used to Reset AutoZero function. Reset REF_P reg (@0x08..0A) set

pressure reference to default value RPDS reg (0x39/3A). RESET_AZ is self cleared. See

AutoZero function.

SIM bit selects the SPI serial interface mode.

0: (default value) 4-wire SPI interface mode selected.

1: 3-wire SPI interface mode selected

110

Reserved

111

Reserved

Table 18. Output data rate bit configurations

ODR2

ODR1

ODR0

Pressure (Hz)

Temperature (Hz)

LPS25H 데이터시트(PDF) 26 Page - STMicroelectronics