LPS27HHTW datasheet(36/55 Pages) STMICROELECTRONICS

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9.5

WHO_AM_I (0Fh)

Device Who am I

9.6

CTRL_REG1 (10h)

Control register 1 (R/W)

ODR2

ODR1

ODR0

EN_LPFP

LPFP_CFG

BDU

SIM

ODR[2:0]

Output data rate selection. Default value: 000

Refer to Table 18.

EN_LPFP

Enable low-pass filter on pressure data when Continuous mode is used. Default value: 0

(0: Low-pass filter disabled; 1: Low-pass filter enabled)

LPFP_CFG

LPFP_CFG: Low-pass configuration register. Default value: 0

Refer to Table 19.

BDU(1)

Block data update. Default value: 0

(0: continuous update;

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

SIM

SPI Serial Interface Mode selection. Default value: 0

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

1. To guarantee the correct behavior of BDU feature, PRESS_OUT_H (2Ah) must be the last address read.

Table 18. Output data rate bit configurations

ODR[2:0]

Temperature, Pressure (Hz)

000

One-shot

001

1 Hz

010

10 Hz

011

25 Hz

100

50 Hz

101

75 Hz

110(1)

100 Hz

111(1)

200 Hz

1. This option disables the low-noise mode automatically.

When the ODR bits are set to '000', the device is in Power-down mode. When the device is in power-down

mode, almost all internal blocks of the device are switched off to minimize power consumption. The I²C interface

is still active to allow communication with the device. The content of the configuration registers is preserved

and output data registers are not updated, therefore keeping the last data sampled in memory before going into

power-down mode.

If the ONE_SHOT bit in CTRL_REG2 (11h) is set to '1', One-shot mode is triggered and a new acquisition starts

when it is required. Enabling this mode is possible only if the device was previously in power-down mode (ODR

bits set to '000'). Once the acquisition is completed and the output registers updated, the device automatically

enters in power-down mode. ONE_SHOT bit self-clears itself.

LPS27HHTW

WHO_AM_I (0Fh)

DS13489 - Rev 1

page 36/55

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