LSM303DLMTR datasheet(14/38 Pages) STMICROELECTRONICS

14 / 38 page

Functionality

LSM303DLM

14/38

Doc ID 018725 Rev 1

Functionality

The LSM303DLM is a system-in-package featuring a 3D digital linear acceleration and 3D

digital magnetic field detection sensor.

The system includes specific sensing elements and an IC interface capable of measuring

both the linear acceleration and the magnetic field applied on it and to provide a signal to the

external world through an I2C serial interface with separated digital output.

The sensing system is manufactured using specialized micromachining processes, while

the IC interfaces are realized using a CMOS technology that allows the design of a

dedicated circuit which is trimmed to better match the sensing element characteristics.

The LSM303DLM features two data-ready signals (RDY) which indicate when a new set of

measured acceleration data and magnetic data are available, therefore simplifying data

synchronization in the digital system that uses the device.

The LSM303DLM may also be configured to generate an inertial wakeup and free-fall

interrupt signal according to a programmed acceleration event along the enabled axes. Both

free-fall and wakeup can be used simultaneously on two different accelerometer interrupts.

5.1

Factory calibration

The IC interface is factory calibrated for linear acceleration sensitivity (LA_So), and linear

acceleration Zero-

g level (LA_TyOff).

The trimming values are stored inside the device in non-volatile memory. When the device is

turned on, the trimming parameters are downloaded into the registers to be used during

normal operation. This allows the use of the device without further calibration.

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