LSM330 datasheet(24/75 Pages) STMICROELECTRONICS

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Functionality

LSM330

24/75

DocID023426 Rev 3

4.3

Angular rate sensor digital main blocks

Figure 6. Angular rate sensor digital block diagram

4.3.1

FIFO

The LSM330 embeds 32 slots of 16 bit data FIFO buffer 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 it can wake up

only when needed and burst the significant data out from the FIFO.

In order to use FIFO it is necessary to enable the FIFO_EN bit in the CTRL_REG5_G (24h)

mode, Stream mode, Bypass-to-Stream mode and Stream-to-FIFO mode. Each mode is

selected by the FM[2:0] bits in the FIFO_CTRL_REG_G (2Eh) register.

Programmable watermark level, FIFO empty or FIFO full events can be enabled to generate

dedicated interrupts on the DRDY_G/INT2_G pin (configuration through CTRL_REG3_G

(22h)) and event detection information is available from FIFO_SRC_REG_G (2Fh). The

watermark level can be configured by the WTM[4:0] bits in FIFO_CTRL_REG_G (2Eh).

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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