ILPS22QSTR datasheet(33/57 Pages) STMICROELECTRONICS

33 / 57 page

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.

9.1

INTERRUPT_CFG (0Bh)

Interrupt mode for pressure acquisition configuration (R/W)

AUTOREFP

RESET_ARP

AUTOZERO

RESET_AZ

LIR

PLE

PHE

AUTOREFP

Enable AUTOREFP function. Default value: 0

(0: normal mode; 1: AUTOREFP enabled)

RESET_ARP

Reset AUTOREFP function. Default value: 0

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

AUTOZERO

Enable AUTOZERO function. Default value: 0

(0: normal mode; 1: AUTOZERO enabled)

RESET_AZ

Reset AUTOZERO function. Default value: 0

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

LIR

Latch interrupt request to the INT_SOURCE (24h) register. Default value: 0

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

PLE

Enable interrupt generation on pressure low event. Default value: 0

(0: disable interrupt request;

1: enable interrupt request on pressure value lower than preset threshold)

PHE

Enable interrupt generation on pressure high event. Default value: 0

(0: disable interrupt request;

1: enable interrupt request on pressure value higher than preset threshold)

Referring to Figure 22. “Threshold-based” interrupt event, the ILPS22QS can be set by the user to support the

interrupt function when P_DIFF_IN (defined below) is higher or lower than the threshold value stored in THS_P_L

(0Ch) and THS_P_H (0Dh).

It is enabled when either the PHE bit or PLE bit (or both bits) is set to 1. Then, the differential pressure can be

compared to a user-defined threshold stored in the 15-bit THS_P (0Ch and 0Dh) registers.

The threshold pressure value defined by the user is a 15-bit unsigned value in a 16-bit register composed of

THS_P_L (0Ch) and THS_P_H (0Dh) The value is:

THS_P (15-bit unsigned) = desired interrupt threshold (hPa) x 16 for full-scale mode 1 (up to 1260 hPa,

FS_MODE bit set to 0 in CTRL_REG2 (11h))

THS_P (15-bit unsigned) = desired interrupt threshold (hPa) x 8 for full-scale mode 2 (up to 4060 hPa, FS_MODE

bit set to 1 in CTRL_REG2 (11h))

The PHE and PLE bits in INTERRUPT_CFG (0Bh) enable the differential pressure interrupt generation on the

positive or negative event respectively.

The differential interrupt must be used with AUTOREFP or AUTOZERO mode.

ILPS22QS

DS13431 - Rev 3

page 33/57

ILPS22QSTR Datasheet(PDF) 33 Page - STMicroelectronics

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