Atmel QTouch AT42QT1040 Operations

Features
•
Number of Keys:
– Up to 4
•
Discrete Outputs:
– 4 discrete outputs indicating individual key touch
•
Technology:
– Patented spread-spectrum charge-transfer (direct mode)
•
Electrode Design:
– Simple self-capacitance style (refer to the Touch Sensors Design Guide)
•
Electrode Materials:
– Etched copper, silver, carbon, Indium Tin Oxide (ITO)
•
Electrode Substrates:
– PCB, FPCB, plastic films, glass
•
Panel Materials:
– Plastic, glass, composites, painted surfaces (low particle density metallic paints
possible)
•
Panel Thickness:
– Up to 10 mm glass, 5 mm plastic (electrode size dependent)
•
Key Sensitivity:
– Fixed key threshold, sensitivity adjusted via sample capacitor value
•
Adjacent Key Suppression
– Patented Adjacent Key Suppression
detection
•
Interface:
– Pin-per-key outputs, plus debug mode to observe sensor signals
•
Moisture Tolerance:
– Good
•
Power:
– 1.8V ~ 5.5V
•
Package:
– 20-pin 3 x 3 mm VQFN RoHS compliant
•
Signal Processing:
– Self-calibration, auto drift compensation, noise filtering, Adjacent Key
Suppression technology
•
Applications:
– Mobile, consumer, white goods, toys, kiosks, POS, and so on
™
™ ™
(AKS ) technology to enable accurate key
Downloaded From Oneyac.com
™
QTouch 4-key
Sensor IC
AT42QT1040
9524B–AT42–04/09