The IQS621 ProxFusion® IC is a multifunctional, ambient light sensing (ALS), capacitance, Hall-effect & inductive sensor designed for applications where any or all of the technologies may be required. The IQS621 is an ultra-low power solution designed for short or long term activations through any of the sensing channels. The IQS621 is fully I2C compatible.

Datasheet: View

Overview: View

PC Software: Download

Demo Software: Download

Video: IQS621 Smart Sensor

Status: Production



  • Unique combination of sensing technologies:
    • Capacitive sensing
    • Ambient light sensing (ALS)
    • Hall-effect sensing
    • Inductive sensing


  • Capacitive sensing:MouserNoMin
    • Full auto-tuning with adjustable sensitivity
    • 2pF to 200pF external capacitive load capability
    • Enhanced temperature stability


  • Ambient light sensing (ALS):ARMmbedPartner contextual blue
    • Absolute lux output
    • Human eye response compensated
    • 4-bit ALS range output (0 - 10)
    • Dual threshold detection for day/night indication with hysteresis


  • Hall-effect sensing:DK Electronics
    • On-chip Hall-effect measurement plates
    • Dual direction Hall switch sensor UI
    • 2 level detection (widely variable)
    • Detection range 10mT – 200mT


  • Inductive sensing:
    • 2 level detection and hysteresis for inductive sensing
    • Only external sense coil required (PCB trace)


  • Low power consumption:
    • 75uA (100Hz response, 1ch inductive)
    • 95uA (100Hz response, 2ch Hall)
    • 75uA (100Hz response, 3ch capacitive)
    • 60uA (100Hz response, ALS)
    • 20uA (20Hz response, 3ch capacitive)
    • 2.5uA (4Hz response, 1ch cap. wake-up)


  • Multiple integrated UI options based on
    years of experience in sensing on fixed and
    mobile platforms:
    • Proximity / Touch
    • Proximity wake-up


  • Automatic Tuning Implementation (ATI) – performance enhancement (10bit)
  • Minimal external components
  • Standard I2C interface
  • Optional RDY indication for event mode operation
  • Supply voltage: 1.8V to 3.3V
  • Low profile UOLG - 2.8 x 2.5 x 0.6 - 9-pin package


  • Mobile electronics (phones/tablets)
  • Home automation & lighting control
  • Wearable devices
  • White goods and appliances
  • Human Interface Devices
  • Aftermarket automotive1

Application Notes:

Coming Soon...

1 The parts are not automotive qualified.