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4 Abbreviations and Definitions
4.1 Definitions
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AVR: refers to a device(s) in the tinyAVR?, megaAVR?, XMEGA? and UC3
microcontroller family.
ARM: refers to a device in the ATSAM ARM? basedmicrocontroller family.
ATMEL QTouch Library : The combination of libraries for both touch sensing acquisition
methods ( QTouch and QMatrix).
QTouch Technology : A type of capacitive touch sensing technology using self
capacitance - each channel has only one electrode.
QMatrix Technology : A type of capacitive touch sensing technology using mutual
capacitance – each channel has an drive electrode (X) and an receive electrode (Y).
Sensor : A channel or group of channels used to form a touch sensor. Sensors are of 3
types (keys, rotors or sliders).
KEY : a single channel forms a single KEY type sensor, also known as a BUTTON
ROTOR , also known as a WHEEL, a group of channels forms a ROTOR sensor to detect
angular position of touch.
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A Rotor is composed of 3 channels for a QTouch acquisition method.
A Rotor can be composed of 3 to 8 channels for QMatrix acquisition method.
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SLIDER , a group of channels forms a SLIDER sensor to detect the linear position of
touch.
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A Slider is composed of 3 channels for a QTouch acquisition method.
A Slider can be composed of 3 to 8 channels for QMatrix acquisition method.
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AKS : Adjacent Key Suppression. See Section 5.4.5
SNS PIN : Sense line for capacitive measurement using the QTouch Technology -
connected to Cs.
SNSK PIN : Sense Key line for capacitive measurement using the QTouch Technology -
connected to channel electrode through Rs.
X Line : The drive electrode (or drive line) used for QMatrix Technology.
Y Line : The receive electrode (or receive line) used for QMatrix Technology.
Port Pair : A combination of SNS port and SNSK port to which sensors are connected for
QTouch technology. The SNS and SNSK ports used in a port pair can be located in the
same AVR Port (8 pins for 4 sensors), or they may be in different 2 different AVR Ports
(8+8 pins for 8 sensors).
Charge Cycle Period : It is the width of the charging pulse applied to the channel
capacitor.
Dwell Cycle : In a QMatrix acquisition method, the duration in which charge coupled from
X to Y is captured.
Acquisition : A single capacitive measurement process.
Electrode : Electrodes are typically areas of copper on a printed circuit board but can also
be areas of clear conductive indium tin oxide (ITO) on a glass or plastic touch screen.
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