LSM9DS0 datasheet(23/74 Pages) STMICROELECTRONICS

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LSM9DS0

Functionality

and burst the significant data out from the FIFO. This buffer can work accordingly in four

different modes: Bypass mode, FIFO mode, Stream mode and Stream-to-FIFO mode. Each

mode is selected by the FIFO_MODE bits in FIFO_SRC_REG (2Fh). Programmable

watermark level, FIFO_Empty or FIFO_Full events can be enabled to generate dedicated

interrupts on the INT1_XM/INT2_XM pin (configured through FIFO_SRC_REG (2Fh)).

4.2.2

Bypass mode

In Bypass mode, the FIFO is not operational and for this reason it remains empty. For each

channel only the first address is used. The remaining FIFO slots are empty.

4.2.3

FIFO mode

In FIFO mode, data from the X, Y and Z channels are stored in the FIFO. A watermark

interrupt can be enabled (FIFO_WTMK_EN bit in FIFO_CTRL_REG (2Eh)) in order to be

raised when the FIFO is filled to the level specified in the FIFO_WTMK_LEVEL bits of

FIFO_CTRL_REG (2Eh). The FIFO continues filling until it is full (32 slots of data for X, Y

and Z). When full, the FIFO stops collecting data from the input channels.

4.2.4

Stream mode

In Stream mode, data from the X, Y and Z measurements are stored in the FIFO. A

watermark interrupt can be enabled and set as in FIFO mode. The FIFO continues filling

until it is full (32 slots of data for X, Y and Z). When full, the FIFO discards the older data as

the new data arrives.

4.2.5

Stream-to-FIFO mode

In Stream-to-FIFO mode, data from the X, Y and Z measurements is stored in the FIFO. A

watermark interrupt can be enabled (FIFO_WTMK_EN bit in FIFO_CTRL_REG (2Eh)) in

order to be raised when the FIFO is filled to the level specified in the FIFO_WTMK_LEVEL

bits of FIFO_CTRL_REG (2Eh). The FIFO continues filling until it is full (32 slots of 8-bit data

for X, Y and Z). When full, the FIFO discards the older data as the data new arrives. Once a

trigger event occurs, the FIFO starts operating in FIFO mode.

4.2.6

Retrieving data from FIFO

A read operation to the OUT_X_L_A (28h), OUT_X_H_A (29h), OUT_Y_L_A (2Ah),

OUT_Y_H_A (2Bh) or OUT_Z_L_A (2Ch), OUT_Z_H_A (2Dh) registers provides the data

stored in the FIFO. Each time data is read from the FIFO, the oldest X, Y and Z data are

placed in the OUT_X_L_A (28h), OUT_X_H_A (29h), OUT_Y_L_A (2Ah), OUT_Y_H_A

(2Bh) and OUT_Z_L_A (2Ch), OUT_Z_H_A (2Dh) registers and both single read and

read_burst operations can be used.

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