LPS331AP

Register description

Doc ID 022112 Rev 7

21/36

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

In default mode (DIF_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.

SIM bit selects the SPI serial interface mode. When SIM is ‘0’ (default value) the 4-wire

interface mode is selected and data coming from the device are sent to pin #7 (SDO).

In 3-wire interface mode, output data are sent to pin #6 (SDI/SDO).

Table 18.

Output data rate bit configurations

ODR2

ODR1

ODR0

Pressure output data rate

Temperature output data

rate

0

0

0

One shot

One shot

001

1 Hz

1 Hz

010

7 Hz

1 Hz

011

12.5 Hz

1 Hz

100

25 Hz

1 Hz

101

7 Hz

7 Hz

1

1

0

12.5 Hz

12.5 Hz

1

1

1

25 Hz

25 Hz