The IQS7225A ProxFusion® IC is a sensor fusion device that is mainly aimed at inductive sensing applications that require relative rotational inductive sensing and/or multiple inductive buttons. The device also has capacitive sensing capabilities that can be used to complement the inductive sensing applications, e.g. a capacitive wakeup channel. The sensor is fully I2C compatible and on-chip calculations enable the IC to respond effectively even in its lowest power modes.

Main Features

  • Highly flexible ProxFusion® device
  • 9 (QFN) external sensor pad connections
  • Configure up to 6 channels using the external connections
  • External inductive sensor options:
    • Up to 6x self-capacitive buttons
    •  Up to 6x mutual-capacitive buttons
    • Up to 6x inductive buttons
  • Built-in basic functions:
    • Gray-coded relative rotational encoder
    • Selectable channel reference
      • LTA as reference
      • select channel to use as reference
      • Fixed value as reference
    • Blocking channel
    • Automatic Tuning Implementation (ATI)
    • Noise filtering
    • Debounce & hysteresis
    • Dual direction trigger indication
  • Built-in signal processing options:
    • Rotational encoder angle
    • Rotational encoder counter
    • Rotational encoder state
    • PC software for debugging and obtaining optimal settings and performance
    • Auto-run from programmed settings for simplified integration
  •  Multi-level trigger implementation:
    • Adjustable number of trigger levels
    • Trigger event states
  • Design simplicity
  • Automated system power modes for optimal response vs consumption
  • I2C communication interface with IRQ/RDY (up to fast plus – 1 MHz)
  • I2C address selection using GPIO pin
  • Event and streaming modes
  • Customizable user interface due to programmable memory
  • Supply voltage range:
    • 1.8 V to 3.5V (FOSC = 14 MHz)
    • 2.2 V to 3.5V (FOSC = 18 MHz)
  • Small packages
    • QFN20 (3 x 3 x 0.5 mm) – 0.4mm pitch


  • Waterproof inductive dial/counter applications
  • Waterproof inductive buttons
  • Integrated control panel (dial + buttons)
  • White goods user interface
  • Wearables
  • Smart home controllers
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