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LSM330D 데이터시트(PDF) 23 Page - STMicroelectronics |
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LSM330D 데이터시트(HTML) 23 Page - STMicroelectronics |
23 / 66 page 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 0 1 HPen LPF2 10 11 01 00 Out_Sel DataReg 00 11 10 01 Interrupt generator INT_Sel I2C SPI INT1 SCR REG CONF REG FIFO 32x16x3 AM07230v1 |
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