LSM6DSO datasheet(4/172 Pages) STMICROELECTRONICS

4 / 172 page

Embedded low-power features

The LSM6DSO has been designed to be fully compliant with Android, featuring the following on-chip functions:

•

9 kybtes data buffering, data can be compressed two or three times

–

100% efficiency with flexible configurations and partitioning

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Possibility to store timestamp

•

Event-detection interrupts (fully configurable)

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Free-fall

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Wakeup

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6D orientation

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Click and double-click sensing

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Activity/Inactivity recognition

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Stationary/Motion detection

•

Specific IP blocks with negligible power consumption and high-performance

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Pedometer functions: step detector and step counters

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Tilt

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Significant Motion Detection

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Finite State Machine (FSM) for accelerometer, gyroscope, and external sensors

•

Sensor hub

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Up to 6 total sensors: 2 internal (accelerometer and gyroscope) and 4 external sensors

2.1

Tilt detection

The tilt function helps to detect activity change and has been implemented in hardware using only the

accelerometer to achieve targets of both ultra-low power consumption and robustness during the short duration of

dynamic accelerations.

The tilt function is based on a trigger of an event each time the device's tilt changes and can be used with

different scenarios, for example:

Triggers when phone is in a front pants pocket and the user goes from sitting to standing or standing to

sitting;

Doesn’t trigger when phone is in a front pants pocket and the user is walking, running or going upstairs.

2.2

Significant Motion Detection

The Significant Motion Detection (SMD) function generates an interrupt when a ‘significant motion’, that could be

due to a change in user location, is detected. In the LSM6DSO device this function has been implemented in

hardware using only the accelerometer.

SMD functionality can be used in location-based applications in order to receive a notification indicating when the

user is changing location.

2.3

Finite State Machine

The LSM6DSO can be configured to generate interrupt signals activated by user-defined motion patterns. To do

this, up to 16 embedded finite state machines can be programmed independently for motion detection such as

glance gestures, absolute wrist tilt, shake and double-shake detection.

Definition of Finite State Machine

A state machine is a mathematical abstraction used to design logic connections. It is a behavioral model

composed of a finite number of states and transitions between states, similar to a flow chart in which one can

inspect the way logic runs when certain conditions are met. The state machine begins with a start state, goes to

different states through transitions dependent on the inputs, and can finally end in a specific state (called stop

state). The current state is determined by the past states of the system. Figure 1. Generic state machine shows a

generic state machine.

LSM6DSO

Embedded low-power features

DS12140 - Rev 2

page 4/172

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