ATQT600 Atmel, ATQT600 Datasheet - Page 161

• Manufacturer Part Number: ATQT600
• Description: KIT EVAL TOUCH FOR QT600
• Manufacturer: Atmel
• Series: QTouch™r

Specifications of ATQT600

• Sensor Type: Touch Screen
• Interface: USB
• Embedded: Yes, Other
• Utilized Ic / Part: ATtiny88, ATmega324PA, ATxmega128A1
• Processor To Be Evaluated: ATtiny88, ATmega324, ATxmega128
• Data Bus Width: 8 bit, 16 bit
• Interface Type: USB
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 1.6 V to 3.6 V
• Silicon Manufacturer: Atmel
• Kit Application Type: Sensor
• Application Sub Type: Touch Sensor
• Kit Contents: USB Bridge, MCU Cards, Touchpad Cards
• Svhc: No SVHC (15-Dec-2010)
• Mcu Supported Families: ATtiny88,
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Sensitivity: -
• Sensing Range: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Figure 48 Schematic overview of QTouch on Tiny20
6.4.4
API Flow diagram for ATtiny20
For the QTouch Libraries, the timing information is provided by the Host Application by updating
the ‘time_current_ms’ variable in the Timer ISR.
The QTouch Library uses this variable to
calculate the necessary timing for Max ON Duration, Drift and Recalibration functionality. Before
using the QTouch Libraries, the Timer ISR must be configured appropriately. Also, the Timer
Interrupt is used to update the ‘time_to_measure_touch’ variable inorder to start a capacitive
touch measurement. It is recommended to call qt_measure_sensors within 100ms each time to
avoid error in QTouch Library timing.
The touch_config_tiny20.h configuration header file can be used to set the desired number of
Touch Sensors (Buttons) as well as individual sensor Threshold, Hysteresis and Recalibration
parameters. The Sensor Global Configuration parameters must be specified using the IAR Linker
define options.
Figure 49 Linker configuration options for Tiny20
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