• Comms mode
• Standalone mode
• 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 in 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
• PCB 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)
• Comms mode: individually settable via simple commands over I2C-compatible interface
• Standalone mode: settings are fixed
• I2C -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 Supply: 1.8 V – 5.5 V
• 14-pin SOIC RoHS compliant IC
• 20-pin VQFN RoHS compliant IC

The AT42QT1070 (QT1070) is a digital burst mode charge-transfer capacitive sensor driver. The device can sense from one to seven keys, dependent on mode.

The QT1070 has the optimized architecture where no external components are required and only 1-pin per channel. It includes all signal processing functions necessary to provide stable sensing under a wide variety of changing conditions, and the outputs are fully debounced.

The QT1070 modulates its bursts in a spread-spectrum fashion in order to heavily suppress the effects of external noise, and to suppress RF emissions. The QT1070 use a dual-pulse method of acquisition. This provides greater noise immunity and eliminates the need for external sampling capacitors, allowing touch sensing using a single pin.