LPS33HW datasheet(33/50 Pages) STMICROELECTRONICS

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LPS33HW

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

To generate an interrupt event based on a user-defined threshold, the DIFF_EN bit must be

set to '1' and the threshold values stored in THS_P_L (0Ch) and THS_P_H (0Dh).

When DIFF_EN = '1', the PHE bit or PLE bit (or both bits) has to be enabled. The PHE and

PLE bits enable the interrupt generation on the positive or negative event respectively.

When DIFF_EN is enabled and AUTOZERO or AUTORIFP is enabled, the defined pressure

threshold values in THS_P (0Ch, 0Dh) is compared with:

P_DIFF_IN = measured pressure - pressure reference

The value of the pressure reference is assigned depending on the AUTOZERO and

AUTORIFP modes given in the next two paragraphs.

54321

AUTORIFP

RESET_ARP

AUTOZERO

RESET_AZ

DIFF_EN

LIR

PLE

PHE

AUTORIFP

AUTORIFP: Enable AutoRifP function. Default value: 0

(0: normal mode; 1: AutoRifP enabled)

RESET_ARP Reset AutoRifP function. Default value: 0

(0: normal mode; 1: reset AutoRifP function)

AUTOZERO

Enable Autozero. Default value: 0

(0: normal mode; 1: Autozero enabled)

RESET_AZ

Reset Autozero function. Default value: 0

(0: normal mode; 1: reset Autozero function)

DIFF_EN

Enable interrupt generation. Default value: 0

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

LIR

Latch interrupt request to the INT_SOURCE register. Default value: 0

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

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)

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)

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