ATAVRQTOUCHX Atmel, ATAVRQTOUCHX Datasheet - Page 169

• 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

6.5.5
The Table below describes the various configuration parameters corresponding to the ATtiny40
QTouch Library.
DEF_QT_DI
DEF_QT_NEG_DRIFT_RATE*(See Note 1)
DEF_QT_POS_DRIFT_RATE*(See Note 1)
DEF_QT_MAX_ON_DURATION
DEF_QT_DRIFT_HOLD_TIME
DEF_QT_POS_RECAL_DELAY
DEF_QT_SIGNAL_RESOLUTION
Note1:
For the case of ATtiny40 devices, a ‘touch’ causes the Signal value measured on the Sensor to
increase above the Sensor Reference value (In the case of Generic Library devices, a ‘touch’
causes the Signal value to decrease below the Reference value).
However, the Negative drift rate and Positive drift rate functionality for the case of Tiny40 devices
shall be consistent with the Generic Library case.
So, it is recommended to have a ‘Slower’ Negative Drift rate (4 seconds is the default setting) and
a ‘Faster’ Positive Drift rate (1 second is the default setting) for the Tiny40 device.
6.5.6
The QTouch method IAR Example project for the Tiny40 Evaluation Kit can be found in the
following path.
\Device_Specific_Libraries\8bit_AVR\AVR_Tiny_Mega_XMega\ATtiny40\tiny40_qt_example_iar
The Example projects demonstrate the 12 button sensor configuration. The Example projects
also support QDebug data transfer to QTouch Studio – Touch Analyzer PC Application.
It is possible to configure the number of Sensors in the Example project from 1 to 12 for testing
on the ATtiny40 Evaluation kit.
QTouch Library configuration parameters for ATtiny40
QTouch Library ATtiny40 Example projects
Parameter
Table 21 QTouch Library for ATtiny40 Configuration parameters
Sensor detect integration (DI) limit.Range: 0u to 255u.
Refer
Sensor negative drift rate. Units: 100ms, Range: 1u to 127u.
Refer
Sensor positive drift rate. Units: 100ms, Range: 1u to 127u.
Refer
Sensor maximum on duration. Units: 100ms, Range: 0u to 255u.
Refer
Sensor drift hold time. Units: 100ms, Range: 1u to 255u.
Refer
Positive Recalibration delay. Range: 1u to 255u.
Refer
Signal Resolution. Range: 10u – 12u. Proper function for values more
than 12u is not guaranteed.
Section 5.3
Section 5.3
Section 5.3
Section 5.3
Section 5.3
Section 5.3
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Section 5.4
Section 5.4
Section 5.4
Section 5.4
Section 5.4
Section 5.4
Description
for more info.
for more info.
for more info.
for more info.
for more info.
for more info.
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