ATQT600 Atmel, ATQT600 Datasheet - Page 58
![KIT EVAL TOUCH FOR QT600](/photos/9/18/91802/qt600_sml.jpg)
ATQT600
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATQT600
Manufacturer:
Atmel
Quantity:
135
10620D–AT42–04/09
Mutual-capacitance One-dimensional Sensors
6.3.2.2
6-4
Wheel
The sensor design for a wheel is essentially the same as that for the slider, but the array of keys are
arranged in a circular form (see
wheels from 15 mm to 21 mm in diameter that are constructed with at least 6 keys. Note that the X
fingers taper to Y
diameter of the wheel.
As with the slider, you will need to calculate the number of X fingers for the wheel. However, as there is
no end border, X
has been calculated is distributed equally across the X fingers.
Figure 6-2.
To design the wheel:
1. Decide on the diameter (D) of the wheel (15 mm to 21 mm).
2. Check that the outer arc (W) of each key in the wheel is between 6 and 8 mm:
If W is < 6 mm, then consider doing one of the following:
– Break the wheel into fewer keys
– Make the diameter of the wheel larger
If W is > 8 mm, then consider doing one of the following:
– Break the wheel into more keys (if the controller supports more keys)
– Make the diameter of the wheel smaller
– Use a resistively interpolated design to artificially break the wheel into smaller pieces
(see
X fingers
taper to
Y
(
Y
width
width
Section 6.4 “Typical Resistively Interpolated Method” on page
One-layer Small Wheel (Spatially Interpolated)
= 0.1–0.5 mm)
X5
X6
W = D / keys) - Y
border
Y
width
T/2 Gap
around Y
is not calculated and any unallocated width remaining after the number of fingers
or slightly greater (not sharp points), and this tapering determines the inner
Figure
X7
X4
width
6-2) and there is no end border. This design can be used for
Between Xs
Y
width
T
T
Gap
X0
X3
³ T
X electrodes require a jumper or via to
connect the
6-10)
W (6–8 mm)
Touch Sensors Design Guide
X2
X1
two isolated X regions
.