LPS22HH datasheet(39/59 Pages) STMICROELECTRONICS

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LPS22HH

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 24: “Threshold-based” interrupt event, the LPS22HH 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. Please refer

to the application note (AN5209: Section 8. Interrupt modes) for further details.

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)

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