ATAVRQTOUCHX Atmel, ATAVRQTOUCHX Datasheet - Page 12

• Manufacturer Part Number: ATAVRQTOUCHX
• Description: BOARD EVAL CAPACITIVE TOUCH
• Manufacturer: Atmel
• Series: QTouch™r

Specifications of ATAVRQTOUCHX

• Sensor Type: Touch, Capacitive
• Sensing Range: 1 Slider, 1 Wheel, 2 Buttons
• Interface: USB
• Voltage - Supply: 5V, USB
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: AT90USB1287, ATxmega128A1
• Silicon Manufacturer: Atmel
• Silicon Family Name: ATxmega
• Kit Contents: Board
• Svhc: No SVHC (15-Dec-2010)
• Core Architecture: AVR
• Core Sub-architecture: AVR19
• Kit Features: One Slider, One Wheel And 2
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sensitivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

5 Generic QTouch Libraries
5.1 Introduction
ATMEL QTouch provides a simple to use solution to realize touch sensing solutions on a range of
supported ATMEL AVR Microcontrollers. The QTouch libraries provide support for both QTouch
and QMatrix acquisition methods.
Touch sensing using QMatrix or QTouch acquisition methods can be added to an application by
linking the appropriate ATMEL QTouch Library for the AVR Microcontroller and using a simple set
of API to define the touch channels and sensors and then calling the touch sensing API’s
periodically (or based on application needs) to retrieve the channel information and determine
touch sensor states.
Figure 5-1 shows a typical configuration of channels when using an AVR and using the ATMEL
QTouch Library. The ATMEL QTouch Library has been added to a host application running on an
AVR microcontroller. The sample configuration illustrates using the library that supports eight
touch channels numbered 0 to 7. The sensors are configured in the following order,
The host application uses the QTouch Library API’s to configure these channels and sensors,
and to initiate detection of a touch using capacitive measurements.
The QTouch libraries use minimal resources of the microcontroller. The sampling of the sensors
is controlled by the QTouch library, while the sampling period is controlled by the application
(possibly using timers, sleep periods, varying the CPU clock, external events like interrupts or
communications, etc).
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Figure 5-1 : Typical interface of the ATMEL QTouch library with the host application.
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Intra-port: A configuration for QTouch acquisition method libraries, when the sensor SNS
and SNSK pins are available on the same port.
Inter-port: A configuration for QTouch acquisition method libraries, when the sensor SNS
and SNSK pins are available on distinct ports.
Sensor 0 on channels 0 to 2 have been configured as a rotor sensor.
Sensor 1 on channels 3 to 5 have been configured as a slider sensor.
Sensor 2 on channel 6 is configured as key sensor.
Sensor 3 on channel 7 is configured as key sensor.
Application
Host
Atmel QTouch
Library
channel 0
channel 1
channel 2
channel 3
channel 4
channel 5
channel 6
channel 7
sensor1
sensor2
sensor3
8207J-AT42-02/11
sensor0