The IQS7221 ProxFusion® IC’s are sensor fusion devices for rotation and angle sensing applications designed for on-axis orientation. ProxFusion® channels are included for integrated UI applications. Two dedicated Quadrature outputs make the product a drop-in replacement for mechanical and optical rotary encoders. The IQS7221E includes a capacitve sensing channel for low power management. While the IQS7221G includes a virtual freewheel UI for more intuitive scrolling, using Inductive sensing to sense when the user finger is resting on the wheel.

Main Features

  • Highly flexible ProxFusion® device
  • Hall effect angle sensor
    • 4 Hall plates
    • Supports on-axis orientation
    • 16-bit absolute angle output
    • < 1° resolution, calculated on-chip
    • Relative/Absolute rotation angle
    •  Detect movement and the direction of movement
    • Wide operational range
    • Automatic Tuning Implementation (ATI)
    • Automatic synchronisation with mechanical ratchet
  • ProxFusion® Channel
    •  Supports one self-capacitive or mutual-capacitive sensor
    • Ultra-low power wake-up on touch
    • Full auto-tuning (ATI) with adjustable sensitivity
  •  Sensor flexibility
    • Internal voltage regulator
    • No external components required for Hall measurements
    • I2C Interface with IRQ line
  •  Design simplicity and support
    • PC software for debugging and configuring for optimal performance
    • Magnet and mechanical constraints, guidelines and best practices
  •  Multiple integrated UIs
    • Proximity and touch events on ProxFusion® channel
    • Proximity wake-up from ultra-low power mode
    • Hysteresis interval mode
    • Event modes with configurable angle-change, interval or touch /prox events
    • Quadrature standalone output for Hall measurements
    • Virtual freewheel UI
  •  Supply Voltage 2.2 V to 3.5V
  • Small packages
    • WLCSP18 (1.62 x 1.62 x 0.5 mm) - interleaved 0.4mm x 0.6mm ball pitch
    • QFN20 (3 x 3 x 0.5 mm) - 0.4mm pitch


  • Scroll-wheels for computer peripherals
  • Applications requiring flexible UI options with Sensor Fusion
  • Mechanical and optical rotary encoder replacements
  • Adjustable knobs
  • Motor encoders
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