LPS25HB Datasheet, PDF (30/40 Pages) STMicroelectronics – MEMS pressure sensor: 260-1260 hPa absolute digital output barometer

Register description
LPS25HB
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
7
6
5
INT_H_L
PP_OD
4
3
Reserved
2
1
0
INT_S2
INT_S1
INT_H_L
PP_OD
INT_S[2:1]
Interrupt active high, low. Default value: 0.
(0: active high; 1: active low)
Push-pull/open drain selection on interrupt pads. Default value: 0.
(0: push-pull; 1: open drain)
Data signal on INT_DRDY pin control bits. Default value: 00.
Refer to Table 20.
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INT_S2
0
0
1
1
Table 20. Interrupt configurations
INT_S1
INT_DRDY pin configuration
0
Data signal (see CTRL_REG4 (23h))
1
Pressure high (P_high)
0
Pressure low (P_low)
1
Pressure low OR high
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.
DocID027112 Rev 2