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9524D–AT42–05/2013
Features
Number of QTouch
®
Keys:
Up to four
Discrete Outputs:
Four 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
®
(AKS
®
) technology to enable accurate
key detection
Interface:
Pin-per-key outputs, plus debug mode to observe sensor signals
Moisture Tolerance:
Increased moisture tolerance based on hardware design and firmware tuning
Signal Processing:
Self-calibration, auto drift compensation, noise filtering
Applications:
Mobile, consumer, white goods, toys, kiosks, POS, and so on
Power:
1.8V –5.5V
Package:
20-pin 3 x 3 mm VQFN RoHS compliant
Atmel AT42QT1040
Four-key QTouch
®
Touch Sensor IC
DATASHEET
