Microchip Technology MGC3140 GestIC Manuel utilisateur

MGC3140

MGC3140 GestIC® Tuning User's Guide

Preface

Important: Notice to customers:

All documentation becomes dated, and this manual is no exception. Microchip tools and

documentation are constantly evolving to meet customer needs, so some actual dialogs and/or

tool descriptions may differ from those in this document. Please refer to our website

(www.microchip.com) to obtain the latest documentation available.

Documents are identified with a “DS” number. This number is located on the bottom of each

page, in front of the page number. The numbering convention for the DS number is

“DSXXXXXA”, where “XXXXX” is the document number and “A” is the revision level of the

document.

Introduction

This document describes how to tune GestIC® systems that consist of an MGC3140 gesture controller

based on Microchip's GestIC technology and Gesture sensor.

Recommended Reading

For the latest information on using the device, read the “MGC3140 3D Tracking and Gesture Controller

Data Sheet” (DS40002037) located on the Microchip website. The release notes (Readme) contain

update information and known issues that may not be included in this user’s guide. For the latest

information on using the Aurea GUI, refer to the “Aurea Graphical User Interface User’s Guide”

(DS40001681) located on the Microchip website.

Table of Contents

Preface............................................................................................................................ 1

1. Introduction................................................................................................................3

1.1. Aurea............................................................................................................................................3

2. Tuning Flow............................................................................................................... 4

3. Tuning........................................................................................................................5

3.1. Electrode Mapping....................................................................................................................... 5

3.2. Extended Parameterization.......................................................................................................... 6

4. Reference Material.................................................................................................. 21

5. Revision History.......................................................................................................22

The Microchip Web Site................................................................................................ 23

Customer Change Notification Service..........................................................................23

Customer Support......................................................................................................... 23

Microchip Devices Code Protection Feature................................................................. 23

Legal Notice...................................................................................................................24

Trademarks................................................................................................................... 24

Quality Management System Certified by DNV.............................................................25

Worldwide Sales and Service........................................................................................26

MGC3140

1. Introduction

The MGC3140 Gesture IC (GestIC) has two types of parameters:

1. Run-time parameters that control basic functions such as selecting which of the five preset

frequencies (between 1 and 5) to use, enabling and disabling gestures and forcing a recalibration

(baseline). These are controlled by the host over the I2C interface using messages defined in the

MGC3140 run-time library interface specification reference.

2. Design-specific design-time parameters, which are configured once per project at design time and

control design characteristics, such as electrode weighting, gesture timings, and signal thresholds.

These parameters are configured using the Aurea Graphical User Interface application.

This document describes the tuning process for both the run-time and the design-time parameters.

1.1 Aurea

The Aurea Graphical Interface User’s Guide describes the use of the Aurea graphical interface to:

• Monitor the output of the MGC3140

• Control MGC3140 run-time parameters

• Configure MGC3140 design-time parameters

• Load design-time parameter files onto the MGC3140

• Program the MGC3140

• Update the MGC3140 bootloader

• Save the MGC3140 firmware and parameterization data in order to provide a final firmware (FW)(1)

and parameterization combination for manufacture

Note:

1. Combines the FW and parameters that are in Aurea that were loaded onto the device. Aurea does

not read firmware from the device.

1.1.1 Firmware and Parameter Update Using Aurea

Aurea uses a compressed file containing MGC3140 firmware, bootloader and parameterization data as

an image source for programming the MGC3140. It can also save the parameterization file and the

existing firmware from the .enz file(1) into a new compressed file. This file is noted by the

extension .enz.

Note:

1. The firmware cannot be read back from the IC. A newly created .enz file will create FW from the

parameters tuned in Aurea (on the PC) and the FW used by Aurea to download to the MGC3140.

1.1.1.1 Aurea .enz File Format

An .enz file is simply a zip container containing a number of files including a special file called

contents.json which describes the content of the .enz file.

•Library.hex – Contains MGC3140 firmware and bootloader in standard Intel® HEX format.

•Library.settings – A text description of design-time parameter settings.

•Loader.hex – Contains the MGC3140 bootloader in standard Intel HEX format.

•Content.json – Describes the contents of the .enz file.

Note: Aurea will not program the bootloader if the current bootloader in the MGC3140 has the same

version as in this file.

MGC3140

Introduction

2. Tuning Flow

It has to be noted that the implemented tuning steps will depend on the customer requirements.

Positional accuracy or reporting, some gestures or GestIC electrode touch, approach and power-saving

may or may not be required.

The following flowchart shows the tuning flow.

Figure 2-1. MGC3140 Tuning Flow

Map electrodes

Load Firmware and

starting parameters

Select parameters to

enable and data

output

Position

Important?

Set sensing area

and height limits

Adjust jitter

reduction

Tune Gestures

Tune Calibration

Tune Presence

Hold and

Approach

Tune electrode

touch if required

Yes

Tuning Complete

Electrode weighting

Configure electrode

dimensions

E-Field Linearization

Select Tx

Frequencies

MGC3140

Tuning Flow

3. Tuning

During the setup process, tuning parameters are adjusted using slide bars that are dragged using the

mouse. For fine tuning, click on the Slider and use the left-right arrow keys to adjust the parameter value.

In order to tune the design-time parameters, select the Setup tab in Aurea and press the 3D

Parameterization button.

Figure 3-1. Aurea Parameterization

The Aurea Setup tab has two top-level menu items on the left:

•Basic – Allows basic setup of the Analog Front-End by mapping the receive electrodes to the

MGC3140 receive pins. This feature provides Printed Circuit Board (PCB) layout flexibility.

•Extended – Allows detailed tuning.

Figure 3-2. Setup - Basic Menu

3.1 Electrode Mapping

The Analog Front-End (AFE) settings comprising of Electrode Selection and Electrode Mapping can be

modified on this page. They adjust the connection between the MGC3140 and the external electrodes.

The settings are adjusted using the corresponding radio buttons or sliders.

•Electrode Selection

The optional Center electrode can be enabled or disabled by checking the four electrodes (no

Center) or five electrodes (with Center) check boxes.

MGC3140

Tuning

– Four electrodes

Only the four frame electrodes (North, East, South, and West) are used for signal processing.

– Five electrodes

All four frame electrodes and the Center electrode are used for signal processing.

•Electrode Mapping

The electrode mapping allocates the MGC3140 RX pins to the outlying electrodes. The correct

electrode mapping can be verified by touching the electrode and monitoring the signals in the

Signals tab. The corresponding electrode signal in the Rx Signals tab should then increase.

3.2 Extended Parameterization

When selected, the Extended menu item opens up the Firmware Selection window. The use of this

window ensures that the correct firmware is loaded onto the MGC3140 for the design-time

parameterization process.

3.2.1 Firmware

Load the firmware and parameter file which will be used as a basis for the tuning using this window, as

described in the "Aurea Graphical User Interface User's Guide" (DS40001681). Remember to select the

“Keep the current AFE parameters” check box unless the AFE electrode selection and mapping of the

parameters that are about to be downloaded are going to be used instead.

Once the firmware has been loaded, the full Extended Parameter window becomes available providing

the following menu options. See figure below.

Note: The extended parameter options are only available after firmware and parameter download. They

disappear after exiting the Setup tab, or disconnecting or resetting the MGC3140, and require another

firmware and parameter download before becoming visible again.

Figure 3-3. Extended Parameter Window

3.2.2 System Start-up Window

This window provides the following features:

MGC3140

Tuning

• Tx frequency selection

• Active features

• Sensor data output

• Start change notification

3.2.2.1 Tx Frequency Selection

The Tx frequency selection is available from the System Start-up window.

A range of five frequencies may be selected or deselected to avoid noise. The MGC3140 constantly

monitors the noise levels on all selected frequencies and will hop to the lowest noise level frequency

when the current frequency noise gets too high. The automatic frequency hopping can be limited by

unchecking one or more frequencies in the list. The following frequencies are available: 42 kHz, 43 kHz,

44 kHz, 45 kHz, and 100 kHz.

3.2.2.2 Active Features

The Colibri Suite features can be active or inactive on MGC3140 start-up.

•Approach Detection – Selects if the Approach Detection feature is enabled at start-up.

•Touch Detection – Selects if the Touch Detection feature is enabled at start-up.

•Gestures – Selects if a particular gesture is active at start-up.

•Flicks – Flick selection has the behavior shown in the table below.

Table 3-1. Flick Selection

Double Flick Edge Flick Normal Flick Description

0 0 0 None Active

0 0 1 Only Normal Flick reported

0 1 0 Only Edge Flick reported

0 1 1 Normal and Edge Flicks reported

1 0 0 Double Flick reported. Disables Normal and Edge Flicks.

Normal and Edge Flicks are never reported.

1 0 1 Double Flick is reported. Disables Normal Flicks and Edge

Flicks. Normal and Edge Flicks are never reported.

1 1 0 Double Flick reported. Disables Normal and Edge Flicks.

Normal and Edge Flicks are never reported. If calibration

after flick is enabled in the Gestures menu by selecting the

'triggers calib' option, then calibrations may still be triggered

when the hand leaves the sensing area after flicks, or in the

middle of a Double Flick.

1 1 1 These settings should not be selected.

Note:

1. 0 = Not selected

2. 1 = Selected

•Circles/AirWheel: Discrete Circles and AirWheel are exclusive. The Airwheel has higher priority

than discrete circles. When the AirWheel is enabled, only AirWheel information will be reported. To

use the Discrete Circle gestures, AirWheel must be disabled.

MGC3140

Tuning

Sensor Data Output

The Sensor Data Output I2C message (ID 0x91) contains all data which are generated in MGC3140. That

includes recognized gestures as well as continuous data like position or raw sensor data.

A detailed description of the I2C message format can be found in the "MGC3140 GestIC® Library

Interface Description User's Guide" (DS40001875).

If selected, data (On or Dynamic) will be added as a payload element to the sensor data output I2C

message.

There are three options for data selection:

•Off – Data will never be sent.

•On – Data are sent with every packet.

•Dynamic – Only changes will be sent to minimize data traffic.

The following table lists the payload elements of the sensor data output message.

Table 3-2. Sensor Data Output Payload Elements

Data/Payload(1) Element Library Command Description

DSP Status DSPStatus This field contains the Calibration

events information and the currently

used Tx frequency.

Gesture Data GestureInfo This field contains the recognized

gestures.

Touch Data TouchInfo This field contains the Touch events

information.

AirWheel Data AirWheelInfo This field contains the AirWheel

information.

Position Data xyzPosition This field contains the X, Y and Z

position data.

Noise Power NoisePower This field contains the current

measured signal variance.

Uncalibrated Signal Data CICData This field contains the Uncalibrated

Signal (CIC) data.

Signal Deviation Data SDData This field contains the Signal Deviation

(SD) data.

AirWheel counter decimated by factor 4 If set, AirWheel counter is only

reported when a change of at least four

bits has occurred.

Note:

1. Payload Element names are those defined in the "MGC3140GestIC® Library Interface Description

User's Guide" (DS40001875).

MGC3140

Tuning

State Change Notification

The sensor has also the possibility to report some Boolean states and, according to the same principle in

the previous section, some can be ignored to minimize the number of messages.

These Boolean states are reported as part of two payload elements: 'System Data', always present in a

message, and 'Gesture Data', that is present depending on the selection of the sensor data output (see

Table 3-2).

The following table describes the Boolean states and to which payload element they belong to.

Table 3-3. Boolean State Descriptions

Payload Element(1) Flag Description

SystemInfo Noise indication The bit reports that environmental noise

has been detected.

SystemInfo DSP running The bit reports that system is running (not

sleeping).

GestureInfo Gesture in progress indication The bit reports that a gesture evaluation is

ongoing.

GestureInfo Garbage The bit de/activates the report of Garbage

gesture.

GestureInfo Hand Presence The bit reports that object is present in

sensitive region.

GestureInfo Hand Inside The bit reports that object is present and

above the sensor.

GestureInfo Hand Hold The bit reports that object is present and

not moving.

None Timestamp overflow indication De/activates the 8-bit counter (timestamp)

overflow message. This has impact on

TouchInfo and AirWheelInfo

messages.

Note:

1. Payload element names are those defined in the "MGC3140GestIC® Library Interface Description

User's Guide" (DS40001875).

3.2.3 Calibration Tuning

Baseline calibration can be caused by a number of triggers:

1. User absent time-out – where no user movement or presence is detected within the User Absent

Calibration Time-out period (configured in the Calibration Time-out window).

2. User present time-out – where an SD that is greater than the threshold set for presence detection

on any electrode indicates the presence of a hand which has not changed position for a specified

time while the Hold flag is triggered (configured in the Calibration Time-out window).

3. Touch time-out – where a touch has been detected for the Touch Calibration Time-out period

(configured in the Calibration Time-out window).

4. Negative Value – when SD achieves invalid negative values less than -4 for 100 ms (cannot be

configured).

MGC3140

Tuning

5. Gesture – flick gestures may be configured to perform a baseline calibration on completion of the

flick (configured in the Gesture Control window).

6. Externally forced – host forces baseline calibration with an I2C message.

The baseline calibration should be set to meet customer requirements.

It should be noted that the User Absent and Present Calibration Time-outs have an impact on the

Approach Detection Idle Time-out before the system enters the Self Wake-up mode.

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