LSM6DS33 datasheet(25/77 Pages) STMICROELECTRONICS

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LSM6DS33

Functionality

A FIFO threshold flag FIFO_STATUS2 (3Bh)(FTH) is asserted when the number of unread

samples in FIFO is greater than or equal to FIFO_CTRL1 (06h) and FIFO_CTRL2

(07h)(FTH [11:0]).

It is possible to route FIFO_STATUS2 (3Bh) (FTH) to the INT1 pin by writing in register

INT1_CTRL (0Dh) (INT1_FTH) = ‘1’ or to the INT2 pin by writing in register INT2_CTRL

(0Eh) (INT2_FTH) = ‘1’.

A full-flag interrupt can be enabled, INT1_CTRL (0Dh) (INT_ FULL_FLAG) = '1', in order to

indicate FIFO saturation and eventually read its content all at once.

If an overrun occurs, at least one of the oldest samples in FIFO has been overwritten and

the OVER_RUN flag in FIFO_STATUS2 (3Bh) is asserted.

In order to empty the FIFO before it is full, it is also possible to pull from FIFO the number of

unread samples available in FIFO_STATUS1 (3Ah) and FIFO_STATUS2 (3Bh)

(DIFF_FIFO[11:0]).

5.4.4

Continuous-to-FIFO mode

In Continuous-to-FIFO mode (FIFO_CTRL5 (0Ah) (FIFO_MODE_[2:0] = 011), FIFO

behavior changes according to the trigger event detected in one of the following interrupt

registers FUNC_SRC (53h), TAP_SRC (1Ch), WAKE_UP_SRC (1Bh) and D6D_SRC

(1Dh).

When the selected trigger bit is equal to '1', FIFO operates in FIFO mode.

When the selected trigger bit is equal to '0', FIFO operates in Continuous mode.

5.4.5

Bypass-to-Continuous mode

In Bypass-to-Continuous mode (FIFO_CTRL5 (0Ah) (FIFO_MODE_[2:0] = '100'), data

measurement storage inside FIFO operates in Continuous mode when selected triggers in

one of the following interrupt registers FUNC_SRC (53h), TAP_SRC (1Ch),

WAKE_UP_SRC (1Bh) and D6D_SRC (1Dh) are equal to '1', otherwise FIFO content is

reset (Bypass mode).

5.4.6

FIFO reading procedure

The data stored in FIFO are accessible from dedicated registers (FIFO_DATA_OUT_L

(3Eh) and FIFO_DATA_OUT_H (3Fh)) and each FIFO sample is composed of 16 bits.

All FIFO status registers (FIFO_STATUS1 (3Ah), FIFO_STATUS2 (3Bh), FIFO_STATUS3

(3Ch), FIFO_STATUS4 (3Dh)) can be read at the start of a reading operation, minimizing

the intervention of the application processor.

Saving data in the FIFO buffer is organized in four FIFO data sets consisting of 6 bytes

each:

The 1st FIFO data set is reserved for gyroscope data;

The 2nd FIFO data set is reserved for accelerometer data;

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