The AT42QT1070-SSU is a digital burst mode charge-transfer capacitive Sensor Driver. The device can sense from one to seven keys, dependent on mode. It 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 de-bounced. It modulates its bursts in a spread-spectrum fashion in order to heavily suppress the effects of external noise and to suppress RF emissions. It uses 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.
- Comms and Standalone Mode Configurations
- 1 to 7 Keys (or 1 to 6 Keys Plus a Guard Channel) Comms Mode
- 1 to 4 Keys Plus a Fixed Guard Channel on Key 0 Standalone Mode
- 5-output Standalone Mode
- Patented Spread-spectrum Charge-transfer Technology
- 6 x 6mm or Larger (Panel Thickness Dependent), Widely Different Sizes and Shapes Possible
- 1 PCB Layer Required
- Etched Copper, Silver, Carbon and Indium Tin Oxide (ITO) Electrode Materials
- Plastic, Glass, Composites and Painted surfaces possible Panel Materials
- Up to 10mm Glass, up to 5mm Plastic (Electrode Size Dependent) Panel Thickness
- Individually settable via simple commands over I2C-compatible interface Comms mode
- I2C-compatible Slave Mode (400kHz), Discrete Detection Outputs Interface
- Self-calibration, Auto Drift Compensation, Noise Filtering, Adjacent Key Suppression? (AKS?)
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