LPS27HHTW datasheet(38/55 Pages) STMICROELECTRONICS

38 / 55 page

INT_H_L selects an interrupt active-high/low value.

PP_OD selects push-pull/open-drain on the interrupt pad.

The IF_ADD_INC bit enables the address to be automatically incremented during a multiple byte access with a

serial interface (SPI or I²C).

The SWRESET bit resets the volatile registers to default value ‘0’. It returns to ‘0’ by hardware.

LOW_NOISE_EN is disabled by default and must be changed when the device is in power-down mode. It enables

low-noise mode but can be used when the ODR is lower than 100 Hz. If ODR = 100 Hz or ODR = 200 Hz, this

option is automatically switched off and the value of the low-noise enable bit is ignored.

LOW_NOISE_EN mode is enabled to have less RMS noise and the best performance is achieved with

LOW_NOISE_EN set to 1 and filter at ODR/20. Depending on the application, the LOW_NOISE_EN bit can

be enabled (low-noise mode) or disabled (low-current mode) to have less RMS noise or less power consumption

(refer to the following table).

Table 20. RMS noise and power consumption

Mode

Additional low-pass

filter status

Device bandwidth

RMS noise [Pa]

Supply current

@ ODR = 1 Hz [µA]

Low noise

Disabled

1.8

Enabled

ODR/9

Enabled

ODR/20

0.7

Low current

Disabled

5.6

Enabled

ODR/9

3.2

Enabled

ODR/20

2.1

The ONE_SHOT bit is used to start a new conversion when the ODR[2:0] bits in CTRL_REG1 (10h) are set

to '000'. Writing a '1' in ONE_SHOT triggers a single measurement of pressure and temperature. Once the

measurement is done, the ONE_SHOT bit will self-clear, the new data are available in the output registers, and

the STATUS (27h) bits are updated.

LPS27HHTW

CTRL_REG2 (11h)

DS13489 - Rev 1

page 38/55

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