LSM330 datasheet(25/75 Pages) STMICROELECTRONICS

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LSM330

Functionality

4.3.2

Bypass mode

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

described in the next figure, for each channel only the first address is used. The remaining

FIFO slots are empty. When new data is available the previous data is overwritten.

Figure 7. Bypass mode

4.3.3

FIFO mode

In FIFO mode, data from the yaw, pitch and roll channels are stored in the FIFO. A

watermark interrupt can be enabled (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 the

FIFO_CTRL_REG_G (2Eh) register. The FIFO continues filling until it is full (32 slots of 16-

bit data for yaw, pitch and roll). When full, the FIFO stops collecting data from the input

channels. To restart collecting data FIFO_CTRL_REG_G (2Eh) must be written back to

Bypass mode. FIFO mode is represented in the following figure.

Figure 8. FIFO mode

x 0

x 1

y 1

x 2

y 2

x 31

y 31

z31

xi,yi,z i

empty

AM07231v1

x 0

x 1

x 2

x 31

y31

z31

xi,yi,z i

AM07232v1

LSM330 Datasheet(PDF) 25 Page - STMicroelectronics