Datasheet

Features
• Configurations:
– Comms mode
– Standalone mode
• Number of Keys:
– Comms mode – 1 to 7 keys (or 1 to 6 keys plus a Guard Channel)
– Standalone mode – 1 to 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 (electrode size dependent)
– 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
• Power:
– 1.8V to 5.5V
• Package:
– 14-pin SOIC RoHS compliant IC
– 20-pin VQFN RoHS compliant IC
• Signal Processing:
– Self-calibration
– Auto drift compensation
– Noise filtering
– Adjacent Key Suppression
®
(AKS
®
– up to three groups possible)
QTouch
7-channel
Sensor IC
AT42QT1070
9596A–AT42–10/10