LSM330D datasheet(23/66 Pages) STMICROELECTRONICS

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LSM330D

Functionality

Doc ID 022562 Rev 2

23/66

4.2

Gyroscope digital main blocks

Figure 5.

Gyroscope block diagram

4.3

FIFO

The LSM330D embeds 32 slots of 16-bit data FIFO for each of the three output channels:

yaw, pitch and roll. This allows consistent power saving for the system, since the host

processor does not need to continuously poll data from the sensor, but can wake up only

when needed and burst the significant data out from the FIFO. This buffer can work

accordingly in five different modes: Bypass mode, FIFO mode, Stream mode, Bypass-to-

Stream mode and Stream-to-FIFO mode. Each mode is selected by the FIFO_MODE bits in

the FIFO_CTRL_REG_G register. Programmable watermark level, FIFO_empty or

FIFO_Full events can be enabled to generate dedicated interrupts on the DRDY_G/INT2_G

pin (configured through the CTRL_REG3_G register) and event detection information is

available in the FIFO_SRC_REG_G register. Watermark level can be configured to WTM4:0

in the FIFO_CTRL_REG_G register.

4.3.1

Bypass mode

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

described in Figure 6 below, for each channel only the first address is used. The remaining

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

ADC

LPF1

HPF

HPen

LPF2

Out_Sel

DataReg

Interrupt

generator

INT_Sel

I2C

SPI

INT1

SCR REG

CONF REG

FIFO

32x16x3

AM07230v1

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