Microchip AT42QT2120 Bedienungsanleitung

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Features

•Number of Keys:

–Comms Mode: 1 to 12 keys (1 to 9 if wheel or slider option enabled)

–Standalone Mode: 1 to 5 keys

•Technology:

–Patented spread-spectrum QTouchADC charge-transfer

•Number of Output Lines:

–Comms Mode: Up to 10 channels can be configured as outputs (but they will

replace the keys)

–Standalone Mode: 1 to 5 channels can be configured as outputs

•Key Outline Sizes:

–5mmx 5mm or larger (panel thickness dependent)

•Key Spacings:

–6mm or wider, center to center (panel thickness, human factors dependent)

•Key Design:

–Single solid or ring shaped electrodes; widely different sizes and shapes possible

•Proximity Electrode Design:

–Single solid electrodes; Key Design, Loop, PCB Trace - different sizes and shapes

possible

•Wheel Size:

–Typically 30mm–50mm diameter

•Wheel Electrode Design:

–Spatially interpolated wheel up to 80mm diameter

–Typical width of segments 12mm

•Slider Electrode Design:

–Spatially interpolated, resistorless design

–Typical length 50mm–100mm, typical width 12mm

–Can be an arc or other irregular shape

•Substrates:

–FR-4, low cost CEM-1 or FR-2 PCB materials; polyamide FPCB; PET films, glass

•Adjacent Metal:

–Compatible with grounded metal immediately next to keys

•Layers Required:

–One; electrodes and components can be on same side

•Electrode Materials:

–Etched copper, silver, carbon, indium tin oxide (ITO), PEDOT

•Panel Materials:

–Plastic, glass, composites, painted surfaces (nonconductive paints)

•Key Panel Thickness:

–Up to 15mm glass (key size dependent)

–Up to 10mm plastic (key size dependent)

•Wheel/slider Panel Thickness:

–Up to 4mm glass

–Up to 3mm plastic

•Key Sensitivity:

–Comms Mode – individually settable via simple commands over I

2

C interface

–Standalone mode – settings are fixed

•Interface:

–

I

2

C slave mode (400kHz)

–CHANGE status indication pin

•Signal Processing:

–Self-calibration, Auto drift compensation, Noise filtering, Adjacent Key

Suppression

®

(AKS

®

)

•Power:

–1.8V to 5.5V

•Packages:

–20-pin SOIC/TSSOP RoHS compliant IC

–20-pad VQFN RoHS compliant IC

QTouch

12-channel

Touch Sensor

IC

AT42QT2120

9634E–AT42–06/12

Produktspezifikationen