Instrukcja obsługi Microchip ATSAMC21N18A

Microchip Niesklasyfikowane ATSAMC21N18A

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User's Guide
QTouch® Modular Library Peripheral Touch Controller
User's Guide
Description
The Microchip QTouch® Peripheral Touch Controller (PTC) offers built-in hardware for capacitive touch measurement
on sensors that function as buttons, sliders, and wheels. The PTC supports both mutual and self-capacitance
measurements without the need for any external component. It offers superb sensitivity and noise tolerance, as well
as self-calibration, and minimizes the sensitivity tuning effort by the user. It also extends the support for capacitive
touch surface and gesture functionality.
The PTC is intended for autonomously performing capacitive touch sensor measurements. The external capacitive
touch sensor is typically formed on a PCB, and the sensor electrodes are connected to the analog charge integrator
of the PTC using the device I/O pins. The PTC supports mutual capacitance sensors organized as capacitive touch
matrices in different X-Y configurations, including Indium Tin Oxide (ITO) sensor grids. In Mutual Capacitance mode,
the PTC requires one pin per X-line (driveline) and one pin per Y-line (sense line). In Self-Capacitance mode, the
PTC requires only one pin with a Y-line driver for each self-capacitance sensor.
Features
• Implements Low-Power, High-Sensitivity, Environmentally Robust Capacitive Touch Buttons
• Supports Mutual Capacitance and Self-Capacitance Sensing
• Up to 46 Buttons in Self-Capacitance mode
• Up to 529 Buttons in Mutual Capacitance mode
• Supports Lumped Mode Configuration
• One Pin Per Electrode
• Load Compensating Charge Sensing
• Parasitic Capacitance Compensation for Mutual Capacitance mode
• Adjustable Gain for Superior Sensitivity
• Zero Drift Over the Temperature and VDD Range
• No Need for Temperature or VDD Compensation
• Hardware Noise Filtering and Noise Signal De-Synchronization for High Conducted Immunity
• Atmel Start QTouch Configurator Support – Wizard Guided Touch Project Creation
Product Support
For assistance related to QTouch capacitive touch sensing software libraries and related issues, contact your local
Microchip sales representative or visit https://www.microchip.com/support/.
© 2020 Microchip Technology Inc. User Guide DS40001986E-page 1
Table of Contents
Description..................................................................................................................................................... 1
Features......................................................................................................................................................... 1
Product Support............................................................................................................................................. 1
1. Introduction............................................................................................................................................. 5
2. Capacitive Touch Measurement..............................................................................................................6
2.1. Self-Capacitance..........................................................................................................................6
2.2. Mutual Capacitance......................................................................................................................7
3. Touch Sensors...................................................................................................................................... 10
3.1. Buttons....................................................................................................................................... 10
3.2. Proximity Sensor........................................................................................................................ 10
3.3. Lumped Sensor..........................................................................................................................10
3.4. Interpolated Sensors.................................................................................................................. 11
3.5. 2D Position Sensors................................................................................................................... 11
3.6. Mix and Match............................................................................................................................ 11
4. PTC....................................................................................................................................................... 12
4.1. Overview.................................................................................................................................... 12
4.2. Self-Capacitance........................................................................................................................12
4.3. Mutual Capacitance....................................................................................................................12
5. QTouch® Modular Library......................................................................................................................14
5.1. Introduction.................................................................................................................................14
5.2. QTouch® Library Modules.......................................................................................................... 14
5.3. Module Naming Conventions..................................................................................................... 14
5.4. QTouch® Library Application Interface....................................................................................... 16
5.5. Application Flow......................................................................................................................... 17
5.6. MISRA Compliance.................................................................................................................... 17
6. Acquisition Module................................................................................................................................ 19
6.1. Overview.................................................................................................................................... 19
6.2. Interface..................................................................................................................................... 19
6.3. Functional Description................................................................................................................19
6.4. Configuration..............................................................................................................................20
7. Boost Mode........................................................................................................................................... 26
7.1. Introduction.................................................................................................................................26
7.2. Configuration..............................................................................................................................26
8. Frequency Hop Module.........................................................................................................................32
8.1. Overview.................................................................................................................................... 32
8.2. Interface..................................................................................................................................... 32
8.3. Functional Description................................................................................................................33
8.4. Configuration..............................................................................................................................33
User's Guide
© 2020 Microchip Technology Inc. User Guide DS40001986E-page 2
9. Frequency Hop Auto-Tune Module....................................................................................................... 36
9.1. Overview.................................................................................................................................... 36
9.2. Interface..................................................................................................................................... 36
9.3. Functional Description................................................................................................................37
9.4. Configuration..............................................................................................................................38
10. Touch Key Module.................................................................................................................................40
10.1. Overview.................................................................................................................................... 40
10.2. Interface..................................................................................................................................... 40
10.3. Functional Description................................................................................................................41
10.4. Configuration.............................................................................................................................. 42
11. Scroller Module..................................................................................................................................... 45
11.1. Overview.................................................................................................................................... 45
11.2. Interface..................................................................................................................................... 45
11.3. Functional Description................................................................................................................46
11.4. Configuration..............................................................................................................................47
12. 2D Surface (One-Finger Touch) CS Module......................................................................................... 50
12.1. Overview.................................................................................................................................... 50
12.2. Interface..................................................................................................................................... 50
12.3. Functional Description................................................................................................................51
12.4. Operation....................................................................................................................................52
12.5. Configuration.............................................................................................................................. 52
13. 2D Surface (Two-Finger Touch) CS/2T Module.................................................................................... 55
13.1. Overview.................................................................................................................................... 55
13.2. Interface..................................................................................................................................... 56
13.3. Functional Description................................................................................................................57
13.4. Operation....................................................................................................................................58
13.5. Configuration.............................................................................................................................. 58
14. Gestures Module...................................................................................................................................61
14.1. Overview.................................................................................................................................... 61
14.2. Interfaces to Module...................................................................................................................62
14.3. Configuration.............................................................................................................................. 62
15. Binding Layer Module........................................................................................................................... 65
15.1. Overview.................................................................................................................................... 65
15.2. Interface..................................................................................................................................... 65
15.3. Functional Description................................................................................................................66
15.4. Configuration.............................................................................................................................. 68
16. Building Applications Using Atmel START............................................................................................ 70
17. Using Data Visualizer with QTouch® Applications.................................................................................71
17.1. Overview.................................................................................................................................... 71
17.2. Datastreamer Module.................................................................................................................71
17.3. Debugging Using Data Visualizer...............................................................................................72
17.4. Debugging Using 2D Touch Surface Utility................................................................................ 76
User's Guide
© 2020 Microchip Technology Inc. User Guide DS40001986E-page 3

Specyfikacje produktu

Marka: Microchip
Kategoria: Niesklasyfikowane
Model: ATSAMC21N18A

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