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AN241091
Hover-touch sensing with PSOC™ 4 CAPSENSE™
About this document
Scope and purpose
This application note shows how to use PSOC™ 4 MCUs with the 5
capacitive sensors to implement hover-touch sensing solutions.
Intended audience
This document is intended for developers, engineers, and designers who are interested in implementing
hover-touch sensing solutions using Infineon's CAPSENSE™ technology.
Note:
This application note is for advanced users of CAPSENSE™ technology who are familiar with
PSOC™ 4 devices, CAPSENSE™ technology, CAPSENSE™ Middleware Library. If the user is new to
CAPSENSE™ technology, see
information on CAPSENSE™ in PSOC™ 4, see
Application note
www.infineon.com
Getting Started with CAPSENSE™
Please read the sections "Important notice" and "Warnings" at the end of this document
Generation CAPSENSE™ technology and
th
application note. For more
PSOC™ 4 and PSOC™ 6 MCU CAPSENSE™ Design
Guide.
002-41091 Rev. **
2025-02-14
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Summary of Contents for Infineon PSOC 4 CAPSENSE
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Page 1: About This Document
Intended audience This document is intended for developers, engineers, and designers who are interested in implementing hover-touch sensing solutions using Infineon’s CAPSENSE™ technology. Note: This application note is for advanced users of CAPSENSE™ technology who are familiar with PSOC™... -
Page 2: Table Of Contents
Hover-touch sensing with PSOC™ 4 CAPSENSE™ Table of contents Table of contents About this document ........................1 Table of contents ..........................2 Introduction .......................... 3 CAPSENSE™ hover-touch sensing ..................... 4 CAPSENSE™ hover-touch sensor applications ..................5 Associated content ......................... 6 Supported devices .......................... -
Page 3: Introduction
Unlike traditional touch sensors that require direct contact with the surface or a strong dielectric medium between the touch surface and the sensing pad, hover touch leverages the highly sensitive capacitive sensing capability of Infineon’s 5th Generation CAPSENSE™ technology to detect touch interactions from a significant distance. -
Page 4: Capsense™ Hover-Touch Sensing
Hover-touch sensing with PSOC™ 4 CAPSENSE™ CAPSENSE™ hover-touch sensing CAPSENSE™ hover-touch sensing CAPSENSE™ hover-touch sensors use the CAPSENSE™ self-capacitance sensing technique, powered by the capacitive sigma-delta (CSD) system. This CSD touch-sensing method provides the industry’s best-in-class Signal-to-Noise ratio (SNR). Self-capacitance uses a single pin and measures the capacitance between the pin and nearby ground. In a CAPSENSE™... -
Page 5: Capsense™ Hover-Touch Sensor Applications
Hover-touch sensing with PSOC™ 4 CAPSENSE™ CAPSENSE™ hover-touch sensing Air Gap Hover-touch Ground Ground sensor Illustration of electric field lines coupling to finger Figure 2 CAPSENSE™ hover-touch sensor applications A hover-touch sensor is a capacitive touch button with the overlay elevated from the PCB. This implementation eliminates the need for the gap to be bridged using a conductive material (typically a spring or conductive foam). -
Page 6: Associated Content
Hover-touch sensing with PSOC™ 4 CAPSENSE™ Associated content Associated content The following section provides the supporting resources relevant to this application note. Supported devices PSOC™ 4000T • Supported kits CY8CPROTO-040T-MS • Online resources CAPSENSE™ sensing controller webpage • ModusToolbox™ software help on Github •... -
Page 7: Designing The Capsense™ Hover-Touch Hardware
Hover-touch sensing with PSOC™ 4 CAPSENSE™ Designing the CAPSENSE™ hover-touch hardware Designing the CAPSENSE™ hover-touch hardware This section describes the various hardware aspects that need to be considered when designing the hover touch sensor buttons. See the Supported devices section for a list of compatible parts. Air gap distance Air gap distance (L ) is the primary consideration when designing a hover-touch button. -
Page 8: Spacing Between The Hover-Touch Buttons
Hover-touch sensing with PSOC™ 4 CAPSENSE™ Designing the CAPSENSE™ hover-touch hardware Air gap (L Hover-touch button Size of the hover-touch button with respect to the air gap Figure 5 Spacing between the hover-touch buttons This parameter is crucial to ensure that each button can function without interfering with its neighboring buttons. -
Page 9: Directionality
Hover-touch sensing with PSOC™ 4 CAPSENSE™ Designing the CAPSENSE™ hover-touch hardware Directionality Due to the highly sensitive nature of a hover-touch sensor, it can detect touches from unintended directions. Implementing directional sensing in an end system poses a significant challenge, as it relies on factors such as overall enclosure design, hardware components, and PCB layout. -
Page 10: Layout Guidelines
Hover-touch sensing with PSOC™ 4 CAPSENSE™ Designing the CAPSENSE™ hover-touch hardware Layout guidelines Layout guidelines for hover-touch sensors are similar to designing the CSD capacitive button sensors. For details, refer to Section 7.4 and Section 2.5.1.2 of AN85951 - PSOC 4 and PSOC 6 MCU CAPSENSE™ design guide. -
Page 11: Design Considerations
Hover-touch sensing with PSOC™ 4 CAPSENSE™ Designing the CAPSENSE™ hover-touch hardware Table 1 Sources of noise and mitigation techniques Noise source Examples Recommended noise mitigation technique PWM driven devices LEDs, motors Design to keep these sources as far as • possible from the sensor Switching power converter AC-DC, DC-DC, DC-AC... -
Page 12: Developing The Capsense™ Hover-Touch System Firmware
Hover-touch sensing with PSOC™ 4 CAPSENSE™ Developing the CAPSENSE™ hover-touch system firmware Developing the CAPSENSE™ hover-touch system firmware This section assumes that the user is familiar with PSOC™ 4 devices, CAPSENSE™ technology, CAPSENSE™ Middleware Library, including the CAPSENSE™ Configurator, and Tuner software tools. For more information, refer to Associated content. -
Page 13: References
References [1] Infineon Technologies AG: AN64846 Getting Started with CAPSENSE™. Rev AA; Available online [2] Infineon Technologies AG: AN85951 PSOC™ 4 and PSOC™ 6 MCU CAPSENSE™ Design Guide. Rev AG; Available online [3] Infineon Technologies AG: Proximity sensing with CAPSENSE™;... -
Page 14: Revision History
Hover-touch sensing with PSOC™ 4 CAPSENSE™ Revision history Revision history Document Date Description of changes revision 2025-02-14 Initial release Application note 002-41091 Rev. ** 2025-02-14... -
Page 15: Disclaimer
Infineon Technologies hereby Infineon Technologies’ products may not be used in disclaims any and all warranties and liabilities of any applications where a failure of the product or any any kind (including without limitation warranties of © 2025 Infineon Technologies AG.
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