LSM6DSOP datasheet(40/107 Pages) STMICROELECTRONICS

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Functionality

LSM6DSOP

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DocID032926 Rev 5

6.5.5

Bypass-to-Continuous mode

In Bypass-to-Continuous mode (FIFO_CTRL4 (0Ah)(FIFO_MODE_[2:0] = '100'), data

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

equal to '1', otherwise FIFO content is reset (Bypass mode).

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

interrupt events:



Wake-up



D6D

6.5.6

Bypass-to-FIFO mode

In Bypass-to-FIFO mode (FIFO_CTRL4 (0Ah)(FIFO_MODE_[2:0] = '111'), data

measurement storage inside FIFO operates in FIFO mode when selected triggers are equal

to '1', otherwise FIFO content is reset (Bypass mode).

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

interrupt events:



Wake-up



D6D

6.5.7

FIFO reading procedure

The data stored in FIFO are accessible from dedicated registers and each FIFO word is

composed of 7 bytes: one tag byte (FIFO_DATA_OUT_TAG (78h), in order to identify the

sensor, and 6 bytes of fixed data (FIFO_DATA_OUT registers from (79h) to (7Eh)).

The DIFF_FIFO_[9:0] field in the FIFO_STATUS1 (3Ah) and FIFO_STATUS2 (3Bh)

registers contains the number of words (1 byte TAG + 6 bytes DATA) collected in FIFO.

In addition, it is possible to configure a counter of the batch events of accelerometer or

gyroscope sensors. The flag COUNTER_BDR_IA in FIFO_STATUS2 (3Bh) alerts that the

counter reaches a selectable threshold (CNT_BDR_TH_[10:0] field in

COUNTER_BDR_REG1 (0Bh) and COUNTER_BDR_REG2 (0Ch)). This allows triggering

the reading of FIFO with the desired latency of one single sensor. The sensor is selectable

using the TRIG_COUNTER_BDR bit in COUNTER_BDR_REG1 (0Bh). As for the other

FIFO status events, the flag COUNTER_BDR_IA can be routed on the INT pin by asserting

the corresponding bit (INT_CNT_BDR of INT_CTRL (0Dh).

In order to maximize the amount of accelerometer and gyroscope data in FIFO, the user can

enable the compression algorithm by setting to 1 both the FIFO_COMPR_EN bit in

EMB_FUNC_EN_B (05h) (embedded functions registers bank) and the

FIFO_COMPR_RT_EN bit in FIFO_CTRL2 (08h). When compression is enabled, it is also

possible to force writing non-compressed data at a selectable rate using the

UNCOPTR_RATE_[1:0] field in FIFO_CTRL2 (08h).

Meta information about accelerometer and gyroscope sensor configuration changes can be

managed by enabling the ODR_CHG_EN bit in FIFO_CTRL2 (08h).

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