LPS225HB datasheet(31/47 Pages) STMICROELECTRONICS

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LPS225HB

The device contains a set of registers which are used to control its behavior and to retrieve

pressure and temperature data. The register address, made up of 7 bits, is used to identify

them and to read/write the data through the serial interface.

8.1

INTERRUPT_CFG (0Bh)

Interrupt configuration

Address:

0Bh (R/W)

Reset:

00h

Description:

Interrupt differential configuration register. See DIFF_EN bit in CTRL_REG1 (10h)

[7] AUTORIFP: Enable AutoRifP. Default value: 0

(0: normal mode; 1: AutoRifP enable);

[6] RESET_ARP: Reset AutoRifP function. Default value: 0

[5] AUTOZERO: Enable Autozero. Default value: 0

(0: normal mode; 1: Autozero enable)

[4] RESET_AZ: Reset Autozero function. Reset RIF_P reg. (address 15h, 16h, 17h),

set pressure reference to default value RPDS reg (address 18h, 19h).

Default value: 0

[3] DIFF_EN: Enable interrupt generation. Default value: 0

(0: interrupt generation disabled; 1: interrupt generation enabled)

[2] LIR: Latch interrupt request to the INT_SOURCE (25h) register. Default value: 0

(0: interrupt request not latched; 1: interrupt request latched)

[1] PLE: Enable interrupt generation on differential pressure low event.

Default value: 0

(0: disable interrupt request; 1: enable interrupt request on measured differential

pressure value lower than preset threshold)

[0] PHE: Enable interrupt generation on differential pressure high event.

Default value: 0

(0: disable interrupt request; 1: enable interrupt request on measured differential

pressure value higher than preset threshold)

AUTORIFP, when written to ‘1’, an internal register is set with current pressure values and

the bit is forced to ‘0’. From that point on the content of the internal register is subtracted

from the pressure output value and result is used for the interrupt generation. The output

registers (PRESS_OUT_XL (28h), PRESS_OUT_L (29h), PRESS_OUT_H (2Ah)) are

updated with the actual pressure value.

The RESET_ARP bit is used to disable the AutoRifP function. RESET_ARP is self-cleared.

54321

AUTORIFP

RESET_ARP

AUTOZERO

RESET_AZ

DIFF_EN

LIR

PLE

PHE

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