A3G4250D 데이터 시트보기 (PDF) - STMicroelectronics

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A3G4250D

MEMS motion sensor: 3-axis digital output gyroscope

STMicroelectronics 

A3G4250D

Figure 9. Stream mode

XIYIZI

X

Y

Z

X

Y

Z

X

Y

Z

X

Y

Z

X

Y

Z

Main digital blocks

3.2.4

!-V

Retrieve data from FIFO

FIFO data is read through the OUT_X, OUT_Y, and OUT_Z registers. When the FIFO is in

stream, trigger or FIFO mode, a read operation to the OUT_X, OUT_Y or OUT_Z registers

provides the data stored in the FIFO. Each time data is read from the FIFO, the oldest pitch,

roll, and yaw data are placed in the OUT_X, OUT_Y and OUT_Z registers, and both single

read and read_burst (X, Y & Z with auto-incremental address) operations can be used. In

read_burst mode, when data included in OUT_Z_H is read, the system again starts to read

information from addr OUT_X_L.

The reading from FIFO may be executed either in synchronous or asynchronous mode. For

correct data acquisition, the following points need to be followed:

1. If reading is synchronous, all data should be acquired within one ODR cycle

2. If reading is asynchronous, an appropriate FIFO access sequence must be applied:

a) A single dummy read @ 28h (increment bit = 0) to update data out

b) A burst read of 6 bytes from 2Ah (Y low) up to 29h:

– Y(2A-2Bh)

– Z(2C - 2Dh)

– X(28-29h)

Figure 10 illustrates the correct sequence with a flow diagram:

Doc 022768 Rev 3

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