LSM9DS0 datasheet(22/74 Pages) STMICROELECTRONICS

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Functionality

LSM9DS0

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DocID024763 Rev 2

Functionality

The LSM9DS0 is a system-in-package featuring a 3D digital accelerometer, a 3D digital

magnetometer, and a 3D digital gyroscope.

The device includes specific sensing elements and two IC interfaces capable of measuring

both the acceleration/magnetometer and angular rate applied to the module and to provide

a signal to external applications through an SPI/I2C serial interface.

The various sensing elements are manufactured using specialized micromachining

processes, while the IC interfaces are developed using a CMOS technology that allows the

design of a dedicated circuit which is trimmed to better match the sensing element

characteristics.

The LSM9DS0 may also be configured to generate an inertial wake-up and free-fall interrupt

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

4.1

Self-test

4.1.1

Accelerometer

The self-test allows the linear acceleration sensor functionality to be tested without moving

it. The self-test function is off when the self-test bit (ST) is programmed to ‘0’. When the self-

test bit is programmed to ‘1’ an actuation force is applied to the sensor, simulating a definite

input acceleration. In this case the sensor outputs exhibit a change in their DC levels which

are related to the selected full scale through the device sensitivity. When the self-test is

activated, the device output level is given by the algebraic sum of the signals produced by

the acceleration acting on the sensor and by the electrostatic test-force. If the output signals

change within the amplitude specified inside Section 2.1: Sensor characteristics, then the

sensor is working properly and the parameters of the interface chip are within the defined

specifications.

4.1.2

Gyroscope

The self-test allows to test the mechanical and electric part of the sensor, allowing the

seismic mass to be moved by means of an electrostatic test-force. When the ST is activated

by the IC, an actuation force is applied to the sensor, emulating a definite Coriolis force. In

this case the sensor output will exhibit an output change.

When the ST is active, the device output is given by the algebraic sum of the signals

produced by the velocity acting on the sensor and by the electrostatic test-force.

For polarity please refer to Table 31: Self-test mode configuration.

4.2

Linear acceleration main digital blocks

4.2.1

FIFO

The LSM9DS0 embeds 32 slots of data FIFO for each of the three output channels: X, Y

and Z. This allows consistent power saving for the system, since the host processor does

not need to continuously poll data from the sensor, but it can wake up only when needed

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