AT42QT1040 4-channel QTouch® Sensor IC0 pages

Atmel AT42QT1040
Four-key QTouch® Touch Sensor IC
DATASHEET

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:

1.8 V – 5.5 V

Package:

20-pin 3 x 3 mm VQFN RoHS compliant

9524D–AT42–05/2013