QT  -  Series DataSheet
AT42QT1040  -  4-channel(4-key) QTouch Sensor IC  -  Atmel  -  Touch Technology

Features
? Number of Keys:
¨CUp to 4
? Discrete Outputs:
¨C4 discrete outputs indicatng individual key touch
? Technology:
¨CPatented spread-spectrum charge-transfer (direct mode
? Electrode Design:
¨CSimple self-capacitancestyle (refer to the Touch Sensors Design Guide)
? Electrode Materials:
¨CEtched copper, silver, carbon, Indium Tin Oxide (ITO
? Electrode Substrates:
¨CPCB, FPCB, plastic films, glas
? Panel Materials:
¨CPlastic, glass, composites, painted surfces (low particle density metallic paints possible)
? Panel Thickness:
¨CUp to 10mm glass, 5mm plastic (electrode size dependent
? Key Sensitivity:
¨CFixed key threshold, sensitivity ajusted via sample capacitor value
?
? Adjacent Key Suppression
? ?
¨CPatented Adjacent Key Suppressio  (AKS ) technology to enable accurate key detection
? Interface:
¨CPin-per-key outputs, plus debg mode to observe sensor signals
? Moisture Tolerance:
¨CGoo
? Power:
¨C1.8V ~ 5.5
? Package:
¨C20-pin 3x 3mm VQFN RoHS complian
? Signal Processing:
¨CSelf-calibration, autodrift compensation, noise filtering, Adjacent Key Suppression technology
? Applications:
¨CMobile, consumer, white goods toys, kiosks, POS, and so on