Azoteq IQS7222C ProxFusion® Controller ICs

Azoteq IQS7222C ProxFusion® Controller ICs are sensor function appliance chips featuring multi-button application modes combined with capacitive slider and wheel capabilities. The sensors offer built-in basic functions such as automatic tuning, noise filtering, differential measurements, debounce/hysteresis, and dual direction trigger indication. The IQS7222C ICs are available in a 0.62mm2 x 0.5mm WLCSP-18 package style or a 3mm2 x 0.5mm QFN20 package. The IQS7222C ProxFusion Controller ICs are fully I2C compatible and on-chip calculations enable the IC to respond effectively even in the lowest power modes.


  • Highly flexible ProxFusion device
  • 9 (QFN)/8 (WLCSP) external sensor pad connections
  • Configure up to 10 Channels using the external connections or internal sensor
  • External sensor options
    • Up to 8 self capacitive buttons
    • Up to 4 self capacitive wear detection pairs (with physical reference)
    • Up to 10 projected capacitive touch/proximity sensors
    • Up to 4 inductive sensor elements
  • Built-in basic functions
    • Automatic tuning
    • Noise filtering
    • Differential measurements (reference channels)
    • Debounce and hysteresis
    • Dual direction trigger indication
  • Built-in signal processing options
    • Slider output
    • Wheel output
  • Simplistic design
    • PC Software for debugging and obtaining optimal settings and performance
    • One-time programmable settings for custom power-on IC configuration
    • Auto-run from programmed settings for simplified integration
  • Automated system power modes for optimal response vs consumption
  • I2C communication interface with IRQ/RDY (up to fast plus -1MHz)
  • Event and streaming modes
  • Customizable user interface due to programmable memory
  • 1.8V (-5%) to 3.5V supply voltage
  • Small package options
    • 1.62mm2 x 0.5mm WLCSP-18 package, interleaved 0.4mm x 0.6mm ball pitch
    • 3mm2 x 0.5mm QFN-20 package, 0.4mm pitch


  • SAR compliance in mobile devices
  • Waterproof buttons (inductive)
  • Wear detection
  • Low power wake-up buttons/proximity
  • Appliance user interface (sliders, wheels, and buttons)


  • Supply voltage range
    • 1.71V to 3.5V at the VDD pin
    • 0V applied at the VSS pin
  • 1µF to 10µF capacitance range
  • ±4000V electrostatic discharge rating
  • Internal regulated supply output
    • 1.5V to 1.75V for the analog domain
    • 1.57V to 1.8V for the digital domain
  • -40°C to +85°C temperature range

Block Diagram

Block Diagram - Azoteq IQS7222C ProxFusion® Controller ICs
Published: 2021-06-28 | Updated: 2022-10-24