LPS27HHW datasheet(40/60 Pages) STMICROELECTRONICS

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LPS27HHW

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DocID032730 Rev 1

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)

Referring to Figure 25: “Threshold-based” interrupt event, the LPS27HHW 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 the DIFF_EN bit in INTERRUPT_CFG (0Bh) register is set to '1' and

either PHE bit or PLE bit (or both bits) = '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

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.

76543210

AUTOREFP

RESET_ARP

AUTOZERO

RESET_AZ

DIFF_EN

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)

DIFF_EN

Enable interrupt generation. Default value: 0

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

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)

LPS27HHW Datasheet(PDF) 40 Page - STMicroelectronics

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