LPS22HB datasheet(37/49 Pages) STMICROELECTRONICS

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LPS22HB

9.5

CTRL_REG1 (10h)

Control register 1

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.

76543210

0(1)

1. This bit must be set to ‘0’ for proper operation of the device.

ODR2

ODR1

ODR0

EN_LPFP

LPFP_CFG

BDU

SIM

ODR [2:0]

Output data rate selection. Default value: 000

Refer to Table 17.

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 18.

BDU(1)

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

Block data update. Default value: 0

(0: continuous update;

1: output registers not updated until MSB and LSB have been read(2))

2. When I2C is used with BDU=1, the IF_ADD_INC bit has to be set to ‘0’ in CTRL_REG2 (11h) and only a

single-byte read of the output registers is allowed.

SIM

SPI Serial Interface Mode selection.Default value: 0

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

Table 17. Output data rate bit configurations

ODR2

ODR1

ODR0

Pressure (Hz)

Temperature (Hz)

000

Power down / one-shot mode enabled

001

1 Hz

10 Hz

011

25 Hz

100

50 Hz

75 Hz

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