LPS22DF datasheet(31/54 Pages) STMICROELECTRONICS

31 / 54 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, the LPS22DF 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 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

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.

LPS22DF

DS13316 - Rev 1

page 31/54

LPS22DF 数据表(PDF) 31 Page - STMicroelectronics

LPS22DF 数据表(HTML) 31 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54

数据表下载