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    1. AVR: refers to a device(s) in the tinyAVR®, megaAVR®, XMEGA™ and UC3 microcontroller family.

    2. ARM: refers to a device in the ATSAM ARM® basedmicrocontroller family.

    3. ATMEL QTouch Library: The combination of libraries for both touch sensing acquisition methods (QTouch and QMatrix).

    4. QTouch Technology: A type of capacitive touch sensing technology using self capacitance - each channel has only one electrode.

    5. QMatrix Technology: A type of capacitive touch sensing technology using mutual capacitance – each channel has an drive electrode (X) and an receive electrode (Y).

    6. Sensor: A channel or group of channels used to form a touch sensor. Sensors are of 3 types (keys, rotors or sliders).

    7. KEY: a single channel forms a single KEY type sensor, also known as a BUTTON

    8. ROTOR: also known as a WHEEL, a group of channels forms a ROTOR sensor to detect angular position of touch.

    9. SLIDER: a group of channels forms a SLIDER sensor to detect the linear position of touch.

    10. AKS: Adjacent Key Suppression. See the section called “Adjacent Key Suppression (AKS)”.

    11. SNS PIN: Sense line for capacitive measurement using the QTouch Technology - connected to Cs.

    12. SNSK PIN: Sense Key line for capacitive measurement using the QTouch Technology - connected to channel electrode through Rs.

    13. X Line: The drive electrode (or drive line) used for QMatrix Technology.

    14. Y Line: The receive electrode (or receive line) used for QMatrix Technology.

    15. 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).

    16. Charge Cycle Period: It is the width of the charging pulse applied to the channel capacitor.

    17. Dwell Cycle: In a QMatrix acquisition method, the duration in which charge coupled from X to Y is captured.

    18. Acquisition:  A single capacitive measurement process.

    19. 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.

    20. Intra-port: A configuration for QTouch acquisition method libraries, when the sensor SNS and SNSK pins are available on the same port.

    21. Inter-port: A configuration for QTouch acquisition method libraries, when the sensor SNS and SNSK pins are available on distinct ports.

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