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Azoteq多点触控设计1
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This design guideline aids designers with the easy integration of ProxSense® technology to new and existing designs. The guideline will give general recommendations for a quick-start design with easy referencing using FAQ. The design guidelines are for surface capacitance specifically, for projected capacitance guidelines
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IQ Switch
®
ProxSense
®
Series
Copyright © Azoteq (Pty) Ltd 2015
AZD008 – Design Guidelines
Page 1 of 15
All rights reserved
Revision 1.06
October 2015
Design Guidelines
IQ Switch
®
- ProxSense
®
Series
Design Guidelines
This design guideline aids designers with the easy integration of ProxSense
®
technology to new
and existing designs. The guideline will give general recommendations for a quick-start design with
easy referencing using FAQ. The design guidelines are for surface capacitance specifically, for
projected capacitance guidelines, please refer to Application Note: AZD036.
OVERVIEW .................................................................................................................................................................. 3
SUBSTRATE ................................................................................................................................................................. 3
PADS & ROUTING ....................................................................................................................................................... 5
OVERLAY .................................................................................................................................................................... 9
TECHNOLOGIES .......................................................................................................................................................... 11
DEBUGGING .............................................................................................................................................................. 14
APPENDIX A. CONTACT INFORMATION .................................................................................................................. 15
What are the benefits of adding capacitive touch pads to a design?
Why add proximity detection to a design?
What factors are the most important when designing a capacitive touch or proximity sensor?
Substrate:
What is an electrode substrate?
What substrate is best suited for a design and what thickness should it be?
Pads & routing:
What is a button / pad / sense antenna / touch pad / key electrode?
What size and shape can the pads be?
How close can the pads be to each other and other traces?
What is parasitic capacitance (C
P
) and why is it bad?
Can a LED be placed in the center of a pad?
What should I know about trace lengths and trace routing?
What are the effects of „floating pours‟ close to a pad?
What to consider when a design has a metal chassis / housing?
What is the effect of a ground pour?
Overlay:
What is an overlay and why use one?
Can capacitive sensing work through a conducting material (metal)?
What material is best suited to use as an overlay?
IQ Switch
®
ProxSense
®
Series
Copyright © Azoteq (Pty) Ltd 2015
AZD008 – Design Guidelines
Page 2 of 15
All rights reserved
Revision 1.06
October 2015
What thickness (d) should an overlay be?
How should an overlay material be mounted to a substrate?
What happens if there is an air-gap between the touch pad and overlay?
Technologies:
How does surface and projected capacitance work and how to relate it to transfers?
What are OTP bits and how are they configured?
EMC & ESD Immunity
Is ProxSense
®
waterproof and what effect will water have on a design?
Is a ProxSense
®
pad scratch proof?
What is ICI and what advantage does it give?
What is the „ATI‟ technology?
Which ICs have the ATI and ICI technologies?
What is an active driven shield?
Why use an active driven shield?
How and when to implement an active driven shield?
What is „zoom‟ when power modes are mentioned and on which ICs is it implemented?
Debugging:
The IC is not working, what to do?
How to avoid detection from touching another buttons‟ tracks?
What to do if the overlay (touch area) is not flat OR a distance away from the PCB where
the capacitive controller IC is located.
IQ Switch
®
ProxSense
®
Series
Copyright © Azoteq (Pty) Ltd 2015
AZD008 – Design Guidelines
Page 3 of 15
All rights reserved
Revision 1.06
October 2015
Overview
What are the benefits of adding capacitive touch pads to a design?
It is purely aimed at replacing most mechanical pads without significant added costs. Mechanical
deterioration of push-buttons over time is no longer a problem, yielding a more reliable solution.
Furthermore, an aesthetic value is added to a design, leaving it with a sleek professional finish.
Why add proximity detection (AirButton
®
) to a design?
The ability to detect the proximity of a user to a device not only adds powerful functionality but also
adds that „WOW‟ factor to a design. The irony in this is that when implementing a capacitive sensor
for touch input, the proximity feature can be implemented for almost no added cost. Azoteq‟s
ProxSense
®
technology is able to detect very small (Fempto-Farad [fF] range) changes in the
capacitance of an environment making the design around sensors important for proximity detection
applications.
Proximity detection is very important in handheld battery applications, for power consumption,
where the screen / MCU can wake-up from a proximity event.
The LCD screen of music players / mobile phones remain OFF as long as it does not detect a
user proximity; or
The screen of a phone can be switched OFF once it detects a users‟ ear again saving valuable
battery power.
A mouse can be woken from a sleep state to continue communication with a computer once it
detects a user.
The screen of non-battery applications could also be woken by a user for example a microwave
oven or refrigerator.
Water faucets can actuate with the presence of a user or a table lamp can turn on with the wave of
a hand.
Security alarms can be activated once an unauthorized entry is detected either in a window pane
or on a door handle.
Navigation devices / tablets / e-readers can display a hidden menu / buttons on a touch screen,
enabling larger viewing capacity with no user in the detection distance.
Azoteq holds the patent to “Trigger a GUI on a proximity event” and all this can happen
preemptively (before user touches device)
What factors are the most important when designing a capacitive touch or proximity
sensor?
The four most important factors to consider when designing with capacitive sensing technology is:
Substrate thickness (thicker is better) – material on which pad/button is placed
Pad/button size (bigger is better)
Thickness of overlay (thinner is better) – material between user and pad/button
Trace length to pad (shorter is better)
Possible questions regarding above mentioned factors will be addressed in this document.
Substrate
What is an electrode substrate?
The material on which the key electrodes are placed is called the substrate. The electrodes should
be electrically conductive and in contact with the substrate material.
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