LSM6DSTX datasheet(4/175 Pages) STMICROELECTRONICS

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Embedded low-power features

The LSM6DSTX has been designed to be fully compliant with Android, featuring the following on-chip functions:

•

9 KB 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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Wake-up

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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 for accelerometer, gyroscope, and external sensors

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Machine learning core (MLC)

•

Sensor hub

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Up to six total sensors: two internal (accelerometer and gyroscope) and four 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 ultralow 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 the phone is in a front pants pocket and the user goes from sitting to standing or standing to

sitting.

•

Does not trigger when the 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 LSM6DSTX device, this function has been implemented in the

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 LSM6DSTX 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.

LSM6DSTX

Embedded low-power features

DS14039 - Rev 1

page 4/175

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