LSM330 datasheet(27/75 Pages) STMICROELECTRONICS

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LSM330

Functionality

4.3.6

Stream-to-FIFO mode

In Stream-to-FIFO mode, data from yaw, pitch and roll measurements are stored in the

FIFO. A watermark interrupt can be enabled on the pin DRDY_G/INT2_G, setting the

I2_WTM bit in CTRL_REG3_G (22h) in order to be raised when the FIFO is filled to the level

specified by the WTM [4:0] bits of FIFO_CTRL_REG_G (2Eh). The FIFO continues filling

until it's full (32 slots of 16-bit data for yaw, pitch and roll). When full, the FIFO discards the

older data as the new data arrive. Once a trigger event occurs (related to INT1_CFG_G

(30h) register events), the FIFO starts operating in FIFO mode. Refer to the following figure.

Figure 11. Stream-to-FIFO mode

4.3.7

Retrieving data from FIFO

FIFO data is read from OUT_X_L_G (28h), OUT_X_H_G (29h) and OUT_Y_L_G (2Ah),

OUT_Y_H_G (2Bh) and OUT_Z_L_G (2Ch), OUT_Z_H_G (2Dh). When the FIFO is in

Stream, Stream-to-FIFO or FIFO mode, a read from the OUT_X_L_G (28h), OUT_X_H_G

(29h), OUT_Y_L_G (2Ah), OUT_Y_H_G (2Bh) and OUT_Z_L_G (2Ch), OUT_Z_H_G (2Dh)

registers provides the data stored in the FIFO.

Each time data is read from the FIFO, the oldest pitch, roll and yaw data are placed in the

OUT_X_L_G (28h), OUT_X_H_G (29h), OUT_Y_L_G (2Ah), OUT_Y_H_G (2Bh) and

OUT_Z_L_G (2Ch), OUT_Z_H_G (2Dh) registers and both single read and read_burst (X, Y

and Z with autoincremental address) operations can be used. When data included in

OUT_Z_H_G (2Dh) is read, the system restarts to read information from OUT_X_L_G

(28h).

x31

y31

z31

xi,yi,z i

Stream Mode

FIFO Mode

Trigger event

x31

y31

z31

xi,yi,z i

x30

y30

z30

AM07236v1

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