ATQT600 Atmel, ATQT600 Datasheet - Page 59

• 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

6.3.3
Touch Sensors Design Guide
One-Layer Medium/Large Slider Or Wheel
3. Apply the rules in
Equation 6-9. Calculation for X
4. Determine where the gaps between the keys occur by calculating the number of X fingers in each
You can now draw the wheel. Note that the X fingers taper to Y
and this tapering will determine the inner diameter of the wheel.
Spatially interpolating a one-layer interdigitated key array to make a longer slider or a large wheel is not
a good way to increase slider length or wheel diameter. While it is possible to design sliders and wheels
in this way, the complexity of doing so makes the use of a resistively interpolated slider or wheel much
more favorable.
See
Layer Medium/Large Slider Or Wheel” on page 6-11
interpolated slider or wheel.
X
key (X
Section 6.4.2 “One-Layer Medium/Large Slider Or Wheel” on page 6-10
fingers
fingers
(see
/ keys).
Figure 6-2
X

X
Where:

nominalfingers
fingers
number; that is, round down to the nearest integer. For example,

...
Section 4.2.2 “X and Y Electrodes” on page 4-2

= (
is the FLOOR operator, defined as the largest integer not greater than the

for definitions).
X
=
nominalfingers

D / (2T + Y
fingers
For a Wheel
/ keys
width

) x keys
)
 
Mutual-capacitance One-dimensional Sensors
for more information on designing a resistively
width
or slightly greater (not sharp points),
and use
Equation 6-9
or
Section 6.4.3 “Two-

6.6

10620D–AT42–04/09
is 6.
to calculate
6-5