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Azoteq IQS227AS/B & IQS228AS/B Single-Channel Devices

Azoteq IQS227AS/B and IQS228AS/B Single-Channel Touch Devices feature an internal voltage regulator and reference capacitor (Cs). The devices include a dedicated pin or pins for the connection of sense electrodes (Cx) and output pins for proximity and touch events on OUT. The polarity of the output pins can be configured. A one-wire open drain data streaming protocol OR I2C interface is implemented for debugging purposes. Device configuration is determined by one-time programmable (OTP) options. Azoteq IQS227AS/B and IQS228AS/B Single-Channel Touch Devices are ideal for mobile devices, white goods and appliances, proximity-activated backlighting, automotive, and a wide range of other applications.

Features

  • IQS227AS/B
    • Sub 2.5µA in low-power mode while sensing Proximity
    • Automatic tuning implementation (ATI) - automatic tuning of sense electrode
    • Internal capacitor implementation (ICI) – reference capacitor on-chip
    • 1.8V to 3.6V supply voltage
    • Minimum external components
    • Data streaming option
    • Advanced on-chip digital signal processing
    • User selectable (OTP)
      • 4 power modes
      • IO sink / source
      • Time-out for stuck key
      • Output mode (direct / latch / toggle)
      • Proximity and touch-button sensitivity
  • IQS228AS/B
    • 1 self-capacitive channel
    • DYCAL™: Intelligent Hysteresis
    • Proximity and touch outputs
    • Automatic tuning
    • Internal reference capacitor
    • Minimum external components
    • 1-wire data streaming
    • I2C debug option
    • User selectable options (OTP)
      • Low-power modes
      • Ext sync control or ext filter control
      • I/O sink or source selection
      • Time-out for stuck key
      • Proximity and touch sensitivity selections
    • 1.8V to 3.6V supply voltage

Applications

  • IQS227AS/B
    • LCD, plasma, and LED TVs
    • GSM cellular telephones – on-ear detection / touch keys
    • LED flashlights or headlamps
    • White goods and appliances
    • Office equipment, toys, sanitary wares
    • Flameproof, hazardous environments
    • Human interface devices
    • Proximity detection enables backlighting activation
    • Wake-up from standby modes
    • Replacement for electromechanical switches
    • Find-in-the-dark (FITD)
    • Automotive
      • Door pocket lighting
      • Electric window controls
  • IQS228AS/B
    • Proximity sensors
    • SAR detection for tablets
    • On-ear detection for mobile phones
    • 3D glasses
    • Personal media players
    • White goods and appliances
    • Human interface devices
    • Proximity activated backlighting

Datasheets

Pubblicato: 2019-08-19 | Aggiornato: 2023-06-06