LPS33HW datasheet(42/50 Pages) STMICROELECTRONICS

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LPS33HW

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8.15

INT_SOURCE (25h)

Interrupt source

8.16

FIFO_STATUS (26h)

FIFO status

6543

BOOT_STATUS

If ‘1’ indicates that the Boot (Reboot) phase is running.

Interrupt active.

(0: no interrupt has been generated;

1: one or more interrupt events have been generated).

Differential pressure Low.

(0: no interrupt has been generated;

1: Low differential pressure event has occurred).

Differential pressure High.

(0: no interrupt has been generated;

1: High differential pressure event has occurred).

54321

FTH_FIFO

OVR

FSS5

FSS4

FSS3

FSS2

FSS1

FSS0

FTH_FIFO

FIFO threshold status.

(0: FIFO filling is lower than the threshold level,

1: FIFO filling is equal or higher than the threshold level).

OVR

FIFO overrun status.

(0: FIFO is not completely full;

1: FIFO is full and at least one sample in the FIFO has been overwritten).

FSS[5:0]

FIFO stored data level.

(000000: FIFO empty, 100000: FIFO is full and has 32 unread samples).

Table 21. FIFO_STATUS example: OVR/FSS details

FTH

OVRN

FSS5

FSS4

FSS3

FSS2

FSS1

FSS0

Description

000000

FIFO empty

--(1)

1. When the number of unread samples in FIFO is greater than the threshold level set in register FIFO_CTRL

(14h), FTH value is ‘1’.

000011 unread sample

...

--(1)

0000032 unread samples

100000

At least one sample has

been overwritten

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