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Part Number:AT42QT1070
Manufacturer:Microchip
Category:Touch and Ges ture
Availability:9308
Description:Comms modeStandalone modeComms mode: 1 – 7 keys (or 1 – 6 keys plus a Guard Channel)Standalone mode: 1 – 4 keys plus a fixed Guard Channel on key 0Number of I/O Lines in Standalone mode: 5 outputsTechnology: Patented spread-spectrum charge-transferKey Outline Sizes: 6 mm x 6 mm or larger (panel thickness dependent); widely different sizes and shapes possiblePCB Layers Required: OneElectrode Materials: Etched copper; Silver; Carbon; Indium Tin Oxide (ITO)Panel Materials: Plastic; Glass; Composites; Painted surfaces (low particle density metallic paints possiblePanel Thickness: Up to 10 mm glass; Up to 5 mm plastic (electrode size dependent)Comms mode: individually settable via simple commands over I2C-compatible interfaceStandalone mode: settings are fixedI2C -compatible slave mode (400 kHz)Discrete detection outputsSignal Processing:Self-calibrationAuto drift compensationNoise filteringAdjacent Key Suppression® (AKS®) – up to three groups possiblePower Supply: 1.8 V – 5.5 V14-pin SOIC RoHS compliant IC20-pin VQFN RoHS compliant IC
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Detailed Product Description
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.
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