ATQT600 Atmel, ATQT600 Datasheet - Page 49
![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
5.3
5.3.1
5.3.2
Touch Sensors Design Guide
Typical Spatially Interpolated Method
Introduction
Small Slider Or Wheel
A spatially interpolated wheel or slider sensor uses three electrodes, all directly connected to the sensor
chip. The form of the electrodes depends on the overall size of the slider or wheel.
Note that the designs shown in this section use the method of “two plus two half” electrodes so that they
are compatible with the spatially interpolated slider technique described in
Resistively Interpolated Method” on page 5-6
same sensor chip can drive either electrode style.
Note also that here and elsewhere in this guide, the order of the channels is determined by the chip used
and, in the case of a wheel, by the rotation of the wheel.
In the context of this document, a small slider is between 21 and 26 mm long and a small wheel is
between 12 and 20 mm diameter.
Note that because the slider or wheel is small in comparison with a typical finger, the linearity and usable
range on the sensor are compromised in favor of simple electrode geometries. A small slider uses
simple rectangular electrodes (see
(see
This design relies on both the touching finger and the front panel to interpolate the channels. Expect
these smaller electrodes to have low sensitivity and plan for front panels of 1.5 mm acrylic or less.
Figure 5-2.
Figure 5-3 on page
Small Slider (Spatially Interpolated)
Channel 0
5-4).
0.1–0.5 mm
Figure
Channel 2
5-2) and a small wheel uses simple wedge-shaped electrodes
from an algorithmic point of view. This means that the
Channel 1
6 8 mm
−
Self-capacitance One-dimensional Sensors
Half width
at end
5 15 mm
−
Section 5.4 “Typical
10620D–AT42–04/09
5-3