LSM303D datasheet(18/52 Pages) STMICROELECTRONICS

18 / 52 page

Functionality

LSM303D

18/52

DocID023312 Rev 2

Stream mode

In Stream mode, data from X, Y and Z measurements are stored in the FIFO. A FIFO

threshold interrupt can be enabled and set as in FIFO mode.The FIFO continues filling until

it’s full. When full, the FIFO discards the older data as the new arrive.

Stream-to-FIFO mode

In Stream-to-FIFO mode, data from X, Y and Z measurements are stored in the FIFO. A

FIFO threshold interrupt can be enabled in order to be raised when the FIFO is filled to the

level specified by the internal register. The FIFO continues filling until it’s full. When full, the

FIFO discards the older data as the new arrive. Once a trigger event occurs, the FIFO starts

operating in FIFO mode.

Bypass-to-Stream mode

In Bypass-to-Stream mode, the FIFO starts operating in Bypass mode and once a trigger

event occurs (related to IG_CFG1 (30h) register events), the FIFO starts operating in

Stream mode.

Retrieving data from FIFO

FIFO data is read from the OUT_X_A, OUT_Y_A and OUT_Z_A registers. When the FIFO

is in Stream, Stream-to-FIFO, Bypass-to-Stream or FIFO mode, a read operation to the

OUT_X_A, OUT_Y_A or OUT_Z_A registers provides the data stored in the FIFO. Each

time data is read from the FIFO, the oldest X, Y and Z data are placed in the OUT_X_A,

OUT_Y_A and OUT_Z_A registers and both single read and read_burst operations can be

used.

4.4

Factory calibration

The IC interface is factory calibrated. The trim values are stored inside the device in

nonvolatile memory. Anytime the device is turned on, the trimming parameters are

downloaded into the registers to be used during normal operation. This allows the user to

use the device without further calibration.

LSM303D 数据表(PDF) 18 Page - STMicroelectronics