9596C–AT42–05/2013
Features
Configurations:
Comms mode
Standalone mode
Number of Keys:
Comms mode: 1 – 7 keys (or 1 – 6 keys plus a Guard Channel)
Standalone mode: 1 – 4 keys plus a fixed Guard Channel on key 0
Number of I/O Lines:
Standalone mode: 5 outputs
Technology:
Patented spread-spectrum charge-transfer
Key Outline Sizes:
6 mm x 6 mm or larger (panel thickness dependent); widely different sizes and
shapes possible
Layers Required:
One
Electrode Materials:
Etched copper; Silver; Carbon; Indium Tin Oxide (ITO)
Panel Materials:
Plastic; Glass; Composites; Painted surfaces (low particle density metallic
paints possible
Panel Thickness:
Up to 10 mm glass; Up to 5 mm plastic (electrode size dependent)
Key Sensitivity:
Comms mode: individually settable via simple commands over I
2
C-compatible
interface
Standalone mode: settings are fixed
Interface:
I
2
C-compatible slave mode (400 kHz). Discrete detection outputs
Signal Processing:
Self-calibration
Auto drift compensation
Noise filtering
Adjacent Key Suppression
®
(AKS
®
) – up to three groups possible
Power:
1.8 V – 5.5 V
Package:
14-pin SOIC RoHS compliant IC
20-pin VQFN RoHS compliant IC
Atmel AT42QT1070
Seven-channel QTouch
®
Touch Sensor IC
DATASHEET
