AT42QT1040

Features Number of Keys: – Up to 4 Discrete Outputs: – 4 discrete outputs indicating individual key touch Technology: www.datasheet4u.com – 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 1. Pinout and Schematic 1.1 Pinout Configuration SNSK2 SNS3 N/C N/C N/C www.datasheet4u.com SNS2 SNSK1 SNS1 SNSK0 SNS0 1 2 3 4 5 6 N/C 7 N/C 8 VSS 9 VDD 20 19 18 17 16 15 14 SNSK3 OUT2 OUT3 OUT1 OUT0 QT1040 13 12 11 10 N...