Microchip Technology MGC3140 GestIC User Manual

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.

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) and parameterization combination for manufacture

MGC3140

Introduction

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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 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.

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into a new compressed file. This file is noted by the

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DS40002055A-page 3

2. Tuning Flow

Map electrodes

Load F irmw are 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 i f required

Yes

Tuning Complete

Electrode w eighting

Configure electrode

dimensions

E-Field Linearization

Select Tx

Frequencies

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

MGC3140

Tuning Flow

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DS40002055A-page 4

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

MGC3140

Tuning

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.

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– 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.

MGC3140

Tuning

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:

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• 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.

MGC3140

Tuning

Table 3-1. Flick Selection

Double Flick Edge Flick Normal Flick Description

0 0 0

0 0 1

0 1 0

0 1 1

1 0 0

1 0 1

1 1 0

1 1 1

Note:

1. 0 = Not selected

2. 1 = Selected

None Active

Only Normal Flick reported

Only Edge Flick reported

Normal and Edge Flicks reported

Double Flick reported. Disables Normal and Edge Flicks. Normal and Edge Flicks are never reported.

Double Flick is reported. Disables Normal Flicks and Edge Flicks. Normal and Edge Flicks are never reported.

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.

These settings should not be 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.

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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

DSP Status

Gesture Data

Touch Data

AirWheel Data

Position Data

Noise Power

Uncalibrated Signal Data

Signal Deviation Data

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Element Library Command Description

DSPStatus

GestureInfo

TouchInfo

AirWheelInfo

xyzPosition

NoisePower

CICData

SDData

This field contains the Calibration events information and the currently used Tx frequency.

This field contains the recognized gestures.

This field contains the Touch events information.

This field contains the AirWheel information.

This field contains the X, Y and Z position data.

This field contains the current measured signal variance.

This field contains the Uncalibrated Signal (CIC) data.

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).

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DS40002055A-page 8

+ 18 hidden pages

Microchip Technology MGC3140 GestIC User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

Table of Contents

1. Introduction

1.1 Aurea

1.1.1 Firmware and Parameter Update Using Aurea

1.1.1.1 Aurea .enz File Format

2. Tuning Flow

3. Tuning

3.1 Electrode Mapping

3.2 Extended Parameterization

3.2.1 Firmware

3.2.2 System Start-up Window

• Tx frequency selection

• Active features