LPS35HW datasheet(31/48 Pages) STMICROELECTRONICS

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LPS35HW

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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)

Table 16: INTERRUPT_CFG (0Bh) register

AUTORIFP

RESET_ARP

AUTOZERO

RESET_AZ

DIFF_EN

LIR

PLE

PHE

AUTORIFP

AUTORIFP: AutoRifP function enable. 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

Autozero enable. 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

Interrupt generation enable. 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)

To generate an interrupt event based on a user defined threshold, 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', PHE bit or PLE bit or both bits have to be enabled. 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 pressure reference is assigned depending on the AUTOZERO and

AUTORIFP modes reported in the next two paragraphs.

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