LPS225HB datasheet(20/47 Pages) STMICROELECTRONICS

20 / 47 page

FIFO

LPS225HB

20/47

DocID030115 Rev 2

4.7

Bypass-to-FIFO mode

In Bypass-to-FIFO mode (FIFO_CTRL (14h)(FMODE2:0) = '111'), data measurement

storage inside FIFO operates in FIFO mode when INT_SOURCE(IA) is equal to '1',

otherwise FIFO content is reset (Bypass mode).

An interrupt generator can be set to the desired configuration through INTERRUPT_CFG

(0Bh).

The INTERRUPT_CFG (0Bh)(LIR) bit should be set to '1' in order to have latched interrupt.

Figure 11. Bypass-to-FIFO mode

4.8

Retrieving data from FIFO

FIFO data is read from PRESS_OUT (Addr. reg 28h, 29h, 2Ah) and TEMP_OUT (Addr. reg

2Bh, 2Ch).

Each time data is read from the FIFO, the oldest data are placed in the PRESS_OUT_XL

(28h), PRESS_OUT_L (29h), PRESS_OUT_H (2Ah), TEMP_OUT_L (2Bh) and

TEMP_OUT_H (2Ch) registers and both single-read and read-burst operations can be

used.

The device automatically updates the reading address and it rolls back to 28h when register

2Ch is reached. In order to read all FIFO levels in multiple byte reading, 160 bytes (5 output

registers by 32 levels) must be read.

LPS225HB Datasheet(PDF) 20 Page - STMicroelectronics