LSM303DLM Datasheet, PDF (14/38 Pages) STMicroelectronics – Sensor module:3-axis accelerometer and 3-axis magnetometer

Functionality
5
Functionality
LSM303DLM
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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Doc ID 018725 Rev 1