LPS25HB datasheet(30/40 Pages) STMICROELECTRONICS

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LPS25HB

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the boot process, the BOOT bit is set again to ‘0’ by hardware. The BOOT bit takes effect

after one ODR clock cycle.

SWRESET is the software reset bit. The device is reset to the power-on configuration if the

SWRESET bit is set to ‘1’ and BOOT is set to ‘1’.

AUTOZERO, when set to ‘1’, the actual pressure output value is copied in REF_P_H (0Ah),

REF_P_L (09h) and REF_P_XL (08h). When this bit is enabled, the register content of

REF_P is subtracted from the pressure output value. To disable autozero, the REF_P

registers have to be cleared.

The ONE_SHOT bit is used to start a new conversion when the ODR[2,0] bits in

CTRL_REG1 (20h) 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_REG bits are updated.

8.8

CTRL_REG3 (22h)

Interrupt control

The device features one set of programmable interrupt sources (INT) that can be configured

to trigger different pressure events. Figure 12 shows the block diagram of the interrupt

generation block and output pressure data.

The device may also be configured to generate, through the interrupt pins, a Data Ready

signal (Drdy) which indicates when a new measured pressure data is available, thus

simplifying data synchronization in digital systems or optimizing system power consumption.

INT_H_L

PP_OD

Reserved

INT_S2

INT_S1

INT_H_L

Interrupt active high, low. Default value: 0.

(0: active high; 1: active low)

PP_OD

Push-pull/open drain selection on interrupt pads. Default value: 0.

(0: push-pull; 1: open drain)

INT_S[2:1]

Data signal on INT_DRDY pin control bits. Default value: 00.

Refer to Table 20.

Table 20. Interrupt configurations

INT_S2

INT_S1

INT_DRDY pin configuration

Data signal (see CTRL_REG4 (23h))

Pressure high (P_high)

Pressure low (P_low)

Pressure low OR high

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