Atmel AT42QT1111-MU AT42QT1111-AU 11-key QTouch Touch Sensor IC DATASHEET Features Sensor Keys: Up to 11 QTouch channels Data Acquisition: Measurement of keys triggered either by a signal applied to the SYNC pin or at regular intervals timed by the AT42QT1111 internal clock Keys measured sequentially for better performance, or in parallel groups for faster operation Raw data for key touches can be read as a report over the SPI interface Discrete Outputs: Configurable Detect outputs indicating individual key touch (7-key mode) Device Setup: Device configuration can be stored in EEPROM Technology: Patented spread-spectrum charge-transfer (direct mode) Key Outline Sizes: 6 mm 6 mm or larger (panel thickness dependent) widely different sizes and shapes possible, including solid or ring shapes Key Spacings: 7 mm center-to-center or more (panel thickness dependent) Layers Required: One 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: Individually settable via simple commands over serial interface Adjacent Key Suppression (AKS ) Patented AKS technology to enable accurate key detection Interface: Full-duplex SPI slave mode (750 kHz), CHANGE pin, discrete detection outputs Moisture Tolerance Increased moisture tolerance based on hardware design and firmware tuning Power: 1.8 V 5.5 V Package: 32-pin 5 5 mm QFN RoHS compliant 32-pin 7 7 mm TQFP RoHS compliant Signal Processing: Self-calibration, auto drift compensation, noise filtering, AKS technology Applications: Consumer and industrial applications, such as TV, media player 9571CAT4205/20131. Pinout and Schematic 1.1 Pinout Configuration 32 31 30 29 28 27 26 25 SNS0K SNS8/DETECT2 1 24 2 23 SNS1 SNS7/DETECT1 3 22 SNS1K SNS7K/DETECT0 4 21 VDD VSS QT1111 QT1110 5 VSS 20 SNS6 SNS2K 6 19 SNS6K SNS2 7 18 VDD 17 8 SNS3 SCK 9 10 11 12 13 16 14 15 1.2 Pin Descriptions Table 1-1. Pin Listing Pin Name Type Comments If Unused, Connect To... 1 SNS0K I/O Sense Pin Leave open 2 SNS1 I/O Sense Pin Leave open 3 SNS1K I/O Sense Pin Leave open 4 Vdd P Power 5 Vss P Supply Ground 6 SNS2K I/O Sense Pin Leave open 7 SNS2 I/O Sense Pin Leave open 8 SNS3 I/O Sense Pin Leave open 9 SNS3K I/O Sense Pin Leave open 10 SNS4 I/O Sense Pin Leave open 11 SNS4K I/O Sense Pin Leave open AT42QT1111-MU / AT42QT1111-AU DATASHEET 2 9571CAT4205/2013 SNS3K SNS0 SNS4 SNS10K/SYNC SNS4K SNS10/DETECT6 SNS5 RESET SNS5K CHANGE SS SNS9K/DETECT5 MOSI SNS9/DETECT4 MISO SNS8K/DETECT3