MGC3130 datasheet(7/40 Pages) MICROCHIP

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 2012 Microchip Technology Inc.

Advance Information

DS41667A-page 7

MGC3130

2.0

FEATURE DESCRIPTION

2.1

Gesture Definition

A hand gesture is the movement of the hand to express

an idea or meaning. The GestIC technology accurately

allows sensing of a user’s free space hand motion for

contact free position tracking, as well as three-dimen-

sional (3D) gesture recognition based on classified

movement patterns.

2.2

GestIC Library

MGC3130 is being provided with a GestIC Library,

stored on the chip’s Flash memory. The library

includes:

• Colibri Suite: Digital Signal Processing (DSP)

algorithms and feature implementations.

• System Control: MGC3130 hardware control

features such as Analog Front End (AFE) access,

interface control and parameters storage.

• Library Loader: GestIC Library update through the

application host’s interface.

2.2.1

COLIBRI SUITE

The Colibri Suite combines data acquisition, digital

signal processing and interpretation.

The Colibri Suite functional features are illustrated in

Figure 2-1 and described in the following sections.

FIGURE 2-1:

COLIBRI SUITE CORE

ELEMENTS

2.2.1.1

Position Tracking

The Colibri Suite’s Position Tracking feature provides

three-dimensional hand position over time and area.

The absolute position data is provided according to the

defined origin of the Cartesian coordinate system (x, y,

z). Position Tracking data is continuously acquired in

parallel to Gesture Recognition. With a position rate of

up to 200 positions/sec., a maximum spatial resolution

of 150 dpi is achieved.

2.2.1.2

Gesture Recognition

The Colibri Suite’s gesture recognition model detects

and classifies hand movement patterns performed

inside the sensing area.

Using advanced stochastic classification based on

Hidden Markov Model (HMM), industry best gesture

recognition rate is being achieved. In addition, there

are some gestures derived from the combination of

Gesture Recognition and spatial information.

The Colibri Suite includes a set of predefined hand

gestures which contains flick, circular and symbol

gestures as the ones outlined below:

• Flick gestures

A flick gesture is a unidirectional gesture in a quick

flicking motion. An example may be a hand movement

from West to East within the sensing area, from South

to North, etc.

• Circular gestures

A circular gesture is a round shape gesture defined by

clock direction (e.g., a “circle clockwise” hand

movement inside the system’s sensing area). A circular

gesture can have an undefined start to end point and

an undefined number of repetitions.

• Symbol gestures

A symbol gesture is a multi-directional gesture with a

defined start and end point. An example for a symbol

gesture is a “check mark” hand movement inside the

sensing area.

2.2.1.3

Approach Detection

Approach Detection is an embedded power-saving

feature of Microchip’s Colibri Suite. It sends MGC3130

to Sleep mode and scans periodically the sensing area

to detect the presence of a human hand.

Utilizing the in-built Self Wake-up mode, Approach

Detection alternates between Sleep and Scan phases.

During the Scan phases, the approach of a human

hand can be detected while very low power is

consumed.

For

details,

please

see

Section 4.2.4.3 “Self Wake-up Mode”.

A detected approach of a user exceeding configured

threshold criteria will alternate the MGC3130 from Self

Wake-up to Processing mode or even the application

host in the overall system.

Digital Signal Processing

Colibri Suite

Position

Tracking

Gesture

Recognition

Approach

Detection

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