LSM330D datasheet(20/66 Pages) STMICROELECTRONICS

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Functionality

LSM330D

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Doc ID 022562 Rev 2

Functionality

The LSM330D is a system-in-package featuring a 3D digital accelerometer and a 3D digital

gyroscope.

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

both the acceleration 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 LSM330D may also be configured to generate an inertial wakeup and free-fall interrupt

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

4.1

Accelerometer

4.1.1

Normal mode, Low power mode

The accelerometer sensor inside the LSM330D inertial module provides two different

operating modes: Normal mode and Low power mode. Normal mode guarantees high

resolution, while Low power mode further reduces current consumption.

The table below summarizes how to select the operating mode and the corresponding

characteristics.

4.1.2

Self-test

Self-test allows the checking of sensor functionality 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 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 in Table 3, then the sensor is working properly and the parameters of

the interface chip are within the defined specifications.

Table 9.

Operating mode selection

Operating mode

CTRL_REG1[3]

(LPen bit)

CTRL_REG4[3]

(HR bit)

BW [Hz]

Turn-on time [ms]

Low power mode (8-bit)

ODR/2

Normal mode (12-bit)

ODR/9

7/ODR(kHz)

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