LSM303DLHC datasheet(15/42 Pages) STMICROELECTRONICS

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LSM303DLHC

Functionality

Doc ID 018771 Rev 1

15/42

Functionality

The LSM303DLHC 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 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 to design a dedicated

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

The LSM303DLHC 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 LSM303DLHC may also be configured to generate a free-fall interrupt signal according

to a programmed acceleration event along the enabled axes.

Linear acceleration operating mode

LSM303DLHC provides two different acceleration operating modes, respectively reported

as “normal mode” and “low-power mode”. While normal mode guarantees high resolution,

low-power mode reduces further the current consumption.

Table 8 summarizes how to select the operating mode.

3.1

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 by a non-volatile memory. Any time the

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

during the normal operation. This allows the user to use the device without further

calibration.

Table 8.

Accelerometer operating mode selection

Operating mode

CTRL_REG1[3]

(LPen bit)

CTRL_REG4[3]

(HR bit)

[Hz]

Turn-on time

[ms]

Low-power mode

ODR/2

Normal mode

ODR/9

7/ODR

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