Rainbow Electronics AT42QT1040 - Manual

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 ™ (AKS ™ ) technology to enable accurate key
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
QTouch
™
4-key
Sensor IC
AT42QT1040
9524A–AT42–03/09