ATAVRQTOUCHX Atmel, ATAVRQTOUCHX Datasheet - Page 160

• 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

6.4.1
6.4.1.1
6.4.2
The QTouch libraries for ATtiny20 devices are supported for the following compiler tool chains.
Tool
IAR Embedded Workbench for Atmel AVR.
IAR Compiler.
6.4.3
For an overview of QTouch method based capacitive touch acquisition, refer
QTouch Acquistion method.
The QTouch Library for ATtiny20 device allows for Sensor configuration and Sensor Acquisition
parameter setting. Based on the input Sensor configuration, the QTouch Library takes care of the
capacitive touch acquisition data capture operations on the external capacitive touch sensors.
The captured Touch Data and Touch Button ON/OFF Status information is then available for user
application.
The diagram below indicates a Typical Sensor arrangement using the Tiny20 device.
QTouch Library uses the ATtiny20 ADC Module to peform capacitive Touch measurements. The
ADC module must be enabled by the Host Application and configured in Free running mode for
QTouch Library to function correctly. The PA0 pin must be configured as Output pin and should
be in HIGH state before the qt_measure_sensors API is called.
used to support upto 5 Touch Buttons. The Touch Buttons must be connected to sequential Port
pins. However, it is not necessary to start the first Touch Button on Port pin PA1. For Example,
when 3 Touch Buttons are required, they can by connected to pins PA5, PA6 and PA7.
The Sensor numbering is always in the increasing order of Port pin.
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6.4.2.1.1
Salient Features of QTouch Library for ATtiny20
1 Physical pin per Touch Button.
1 to 5 Touch Buttons can be configured.
Individual Sensor Threshold, Sensor Hysteresis and Sensor Global acquisition
parameters can be configured.
Adjacent Key Supression (AKS) support.
QTouch Studio support for Touch data analysis.
‘C’ Programming interface for easy inclusion of User application.
Compiler tool chain support for ATtiny20
Overview of QTouch Library for ATtiny20
QTouch method sensor
Table 17 Compiler tool chains support for ATtiny20 QTouch Library
Port pins PA1 to PA7 can be
Version
5.5
8207J-AT42-02/11
Section 5.2.1
The