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2 Introduction
ATMEL QTouch Library is a royalty free software library (available for GCC and IAR compiler tool
chains) for developing touch applications on standard AVR and SAM microcontrollers. Customers
can link the library into their applications in order to provide touch sensing capability in their
projects. The Library can be used to develop single chip solutions for control applications which
have touch sensing capabilities, or to develop standalone touch sensing solutions which interface
with other host or control devices.
Features of ATMEL QTouch Library include
Includes Adjacent Key Suppression (AKS ) technology for the unambiguous detection of
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Capacitive touch sensing using patented charge-transfer signal acquisition for robust
sensing.
Support for a wide range of 8- and 32-bit AVRs.
Support for 32-bit ARM microcontrollers.
Support for 8-bit tiny AVRs having flash of 2K bytes.
Support both QTouch and QMatrix acquisition methods and autonomous touch for UC3L.
Support up to 64 touch sense channels for generic libraries and up to 136 channels for
UC3L libraries.
Flexible choice of touch sensing functionality (keys, sliders, wheels) in a variety of
combinations.
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key events.
Support for both IAR and GCC compiler tool chains.
A comparison of various features and parameters between QTouch Libraries for Generic
8-bit and 32-bit AVRs as well as Device Specific Libraries is provided in the table below.
Feature Comparison between Generic QTouch Libraries and Device Specific Libraries
Parameter/Func
tionality
Generic
Libraries,
Tiny 2K
Libraries
Tiny20
Libraries
Tiny40
Libraries
Generic
Libraries,
UC3L
Libraries
ATSAM
Libraries
Tiny_Meg
a_Xmega
32 Bit
AVR
Technology
QTouch,
QTouch
QTouch-
QTouch-
QTouch,
QTouch,
QTouch
QMatrix
ADC
ADC
QMatrix
QMatrix
Rotors/Sliders
Yes
No
No
No
Yes
Yes
Yes
Support
Filter Callback
Library Status
Yes
Yes
Yes
Yes
No
No
Yes
Yes(Only
Yes
Yes
Yes
Yes
Yes
Yes
Flags
Burst Again
Flag)
Library
Yes
No
No
No
Yes
Yes
Yes
Signature
Calibrate
Yes
Yes (Only
No
Yes
Yes
Yes
Yes
Sensing
burst_again
flag)
Reset Sensing
Sensor Deltas
Maximum AKS
Yes
Yes
7
Yes
Yes
7
No
No
1
Yes
Yes
7
Yes
Yes
7
Yes
Yes
7
Yes
Yes
7
Groups
9
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