Microchip Technology Inc

AT42QT1040

In Production

Digital burst mode, charge-transfer capacitive sensor driver designed for touch-key applications. It can sense from one to four keys-one to three keys can be disabled by not installing their respective sense capacitors. The device includes all signal processing functions necessary to provide stable sensing under a wide variety of changing conditions. The outputs are fully debounced. Only a few external parts are required for operation. The device modulates its bursts in a spread-spectrum fashion in order to heavily suppress the effects of external noise and to suppress RF emissions.

 

    Features

        • Four discrete outputs indicating individual key touch
        • Technology: Patented spread-spectrum charge-transfer (direct mode)
        • Electrode Design: Simple self-capacitance style
        • Electrode Materials: Etched copper, silver, carbon, Indium Tin Oxide (ITO)
        • Electrode Substrates: PCB, FPCB, plastic films, glass
        • Panel Materials: Plastic, glass, composites, painted surfaces (low particle density metallic paints possible)
        • Panel Thickness: Up to 10 mm glass, 5 mm plastic (electrode size dependent)
        • Key Sensitivity: Fixed key threshold, sensitivity adjusted via sample capacitor value
        • Patented Adjacent Key Suppression® (AKS®) technology to enable accurate key detection
        • Interface: Pin-per-key outputs, plus debug mode to observe sensor signals
        • Moisture Tolerance: Increased moisture tolerance based on hardware design and firmware tuning
        • Signal Processing: Self-calibration, auto drift compensation, noise filtering
        • Applications: Mobile, consumer, white goods, toys, kiosks, POS
        • Power: 1.8 V – 5.5 V
        • Package: 20-pin 3 x 3 mm VQFN RoHS compliant
    Parameter Name
    Value
    Product Type
    Proximity/Keys/Slider
    Input Channels
    4
    Max Number of Keys
    4
    Interface
    Digital Output
    Voltage Range
    1.8V - 5.5V
    Documentation
    Data Sheets
    05/01/2013
    254KB
      Application Notes
     
     
     
    AppNote
    11/01/2011
    1033KB
    AppNote
    12/01/2012
    286KB
    AppNote
    07/01/2014
    2509KB
    AppNote
    12/10/2016
    1161KB
    AppNote
    10/01/2008
    64KB
    AppNote
    10/01/2008
    272KB
      Brochures
     
     
     
    Brochures
    03/01/2009
    543KB
    Brochures
    12/10/2016
    4660KB
    Pricing & Samples
    All pricing shown in USD only.
    Part Number
    Leads
    Package Type
    Temp Range
    Packing
    1+
    26+
    100+
    1000+
    5000+
    Buy
    Sample
    AT42QT1040-MMHR
    20
    VQFN
    -40C to +85C
    T/R
    1.25
    1.15
    1.04
    0.96
    0.91

    ** Device not available to purchase online. Please contact a sales office for pricing information.
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    RoHS Information
    Part
    Number
    Device
    Weight
    Shipping
    Weight
    Lead
    Count
    Package
    Type
    Package
    Width
    Solder
    Composition
    JEDEC
    Indicator
    RoHS
     
    China
    EFUP
    AT42QT1040-MMHR
    0.018900
    0.061000
    20
    VQFN
    3x3x0.85mm
    NiPdAu
    e4
    To see a complete listing of RoHS data for this device, please Click here
    Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.