LPS25HB datasheet(28/40 Pages) STMICROELECTRONICS

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LPS25HB

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DocID027112 Rev 2

8.6

CTRL_REG1 (20h)

Control register 1

The PD bit allows the turn on of the device. The device is in power-down mode when PD is

set to ‘0’ (default value after boot). The device is active when PD is set to ‘1’.

The ODR[2,0] bits can be configured as described in Table 19. When ODR[2,0] are set to

‘000’ the device enables one-shot mode. When ‘ONESHOT’ bit in CTRL_REG2 (21h) is

set to ‘1’, a new set of data for pressure and temperature is acquired.

The DIFF_EN bit is used to enable the computing of differential pressure output. It is

recommended to enable DIFF_EN after the configuration of REF_P_H (0Ah), REF_P_L

(09h), REF_P_XL (08h), THS_P_H (31h) and THS_P_L (30h).

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

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

parts are updated continuously. When the BDU is activated (BDU = ‘1’), the content of the

ODR2

ODR1

ODR0

DIFF_EN

BDU

RESET_AZ

SIM

Power-down control. Default value: 0

(0: power-down mode; 1: active mode)

ODR [2:0]

Output data rate selection. Default value: 000

Refer to Table 19.

DIFF_EN

Interrupt generation enable. Default value: 0

(0: interrupt generation disabled; 1: interrupt generation enabled)

BDU

Block data update. Default value: 0

(0: continuous update;

1: output registers not updated until MSB and LSB have been read)

RESET_AZ

Reset Autozero function. Default value: 0.

(0: normal mode; 1: reset Autozero function)

SIM

SPI Serial Interface Mode selection.Default value: 0

(0: 4-wire interface; 1: 3-wire interface)

Table 19. Output data rate bit configurations

ODR2

ODR1

ODR0

Pressure (Hz)

Temperature (Hz)

000

One-shot mode enabled

001

1 Hz

010

7 Hz

011

12.5 Hz

100

25 Hz

101

Reserved

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