LPS35HW datasheet(17/48 Pages) STMICROELECTRONICS

17 / 48 page

LPS35HW

FIFO

DocID029129 Rev 1

17/48

Figure 8: Stream mode

In the latter case reading all FIFO content before an overrun interrupt has occurred, the first

data read is equal to the last already read in the previous burst, so the number of new data

available in FIFO depends on the previous reading.

4.4

Dynamic-Stream mode

In Dynamic-Stream mode (FIFO_CTRL(FMODE2:0) = 110) after emptying the FIFO, the

first new sample that arrives becomes the first to be read in a subsequent read burst. In

this way the number of new data available in FIFO does not depend on the previous

reading.

In Dynamic-Stream mode FIFO_STATUS(FSS5:0) is the number of new pressure and

temperature samples available in the FIFO buffer.

Stream Mode is intended to be used reading all 32 samples of FIFO within an ODR after

receiving an overrun signal.

Dynamic-Stream is intended to be used to read FIFO_STATUS(FSS5:0) samples when it is

not possible to guarantee reading data within an ODR.

Also, a FIFO threshold interrupt on the INT_DRDY pad through CTRL3(F_FTH) can be

enabled in order to read data from the FIFO and leave free memory slots for incoming data.

LPS35HW Datasheet(PDF) 17 Page - STMicroelectronics