L3GD20TR datasheet(17/44 Pages) STMICROELECTRONICS

Part #	L3GD20TR

Description	MEMS motion sensor: three-axis digital output gyroscope

PDF	44 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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17 / 44 page

L3GD20

Digital main blocks

Doc ID 022116 Rev 1

17/44

4.2.1

Bypass mode

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

described in

Figure 7 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.

Figure 7.

Bypass mode

4.2.2

FIFO mode

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

interrupt can be enabled (I2_WMK bit into CTRL_REG3 (22h)) in order to be raised when

the FIFO is filled to the level specified in the WTM 4:0 bits of FIFO_CTRL_REG (2Eh). 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 data collection, the

FIFO_CTRL_REG (2Eh) must be written back to Bypass mode.

FIFO mode is represented in

Figure 8: FIFO mode.

x31

y31

z31

xi,yi,zi

empty

AM07231v1

L3GD20TR Datasheet(PDF) 17 Page - STMicroelectronics