The IQS231/A single channel capacitive proximity/touch controller for SAR applications. The IQS231/A has human movement detection and can detect human interaction during power on and a quick release. The device also features failsafe operation with a heartbeat.



  • Optimized for SAR applications
  • Human movement detection - distinguish between humans and inanimate objects
  • Failsafe operation with heartbeat
  • Quick release for preventing unwanted activations
  • Minimal external components
  • Standalone and I2C modes
  • OTP or I2C configuration
  • Optional external threshold adjustment
  • Self and Projected capacitive sensing
  • Synchronization input for strategic sampling windows
  • Various power modes: 100Hz, 30Hz, 8Hz, 4Hz sample rates
  • Pin compatible replacement solution for the IQS128
  • 6 pin TSOT23-6
  • 10 pin DFN (IQS231A)
  • 8 pin WLCSP (IQS231A)


  • SAR Sensor
  • Hybrid antennas (RF and capacitive sensing combined)
  • Movement sensing applications (user interaction detection, anti-theft)
  • Hold detection for screen activation
  • On-ear detection
Let us help you implement your IQS231A/B.
We’ve done it before.
If you don’t believe us test it yourself.

Includes 1x IQS231A Shield board, 3x IQS231A Stamp module and 10x IQS231A IC’s.
Connect Shield board and Stamp module to PC via CT210/A to evaluate user proximity, quick release ability and threshold input select option with GUI.

 NOTE: CT210/A sold separately.

Iqs231 Ev02 Azoteq Product Evaluation Kits
Order Online
User Guide

Azoteq provides software used for the serial streaming of data to a computer utilising the Azoteq USB-dongles. Each IC has its own dedicated software and is intended for prototyping purposes and can be found on the Azoteq website under Software and Tools.

Order Online
User Guide
Feel free to order us around.