Atmel AT42QT1085 Manual

Features
®
•
QTouch Sensor Channels
– Up to 8 keys
•
Integrated Haptic Engine
– Haptic events may be triggered by touch detection or controlled by a host
microcontroller over SPI
•
Data Acquisition
– QTouchADC key measurement/touch detection method
– Configurable measurement timing and averaging
– Spread spectrum charge transfer
– Raw data from channel measurement can be read over the SPI interface
•
GPIO Pins
– 12 dedicated bi-directional GPIO pins, plus up to 4 additional pins (replacing keys)
– Configurable as software PWM Drive, digital inputs or outputs
•
Device setup
– Device configuration may be stored in NVRAM
•
Operation
– Power-On reset and brown-out detection
– Internal calibrated oscillator
•
Key Outline Sizes
– 6 mm x 6 mm or larger (panel thickness dependent); widely different sizes and
shapes possible, including solid or ring shapes
•
Key Spacing
– 7 mm centre to centre or more (panel thickness dependent)
•
Layers required
– One
•
Electrode Materials:
– Etched copper, silver, carbon, ITO
•
Electrode Substrates:
– PCB materials; polyamide FPCB; PET 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 configured over SPI interface
•
Signal Processing:
– Self-calibration, auto drift compensation, noise filtering
– Patented Adjacent Key Suppression
detection
•
Interface:
– Master/Slave SPI interface, up to 750 kHz
– Object-based communications protocol
•
Power:
– 2.0V to 5.5V
•
Packages:
– 32-pin 5 x 5 mm MLF RoHS compliant
– 32-pin 7 x 7mm TQFP RoHS compliant
® ®
(AKS ) technology to ensure accurate key
QTouch 8-key
Touch Sensor IC
AT42QT1085
9625C–AT42–12/11