The IQS211A & IQS211B ProxSense® ICs are self-capacitance controllers designed for applications where an awake/activate on proximity/touch function is required. The IQS211A/B uses movement detection for applications that require long term detection. The IQS211A/B operates standalone or I2C and can be configured via OTP (One Time Programmable) bits.

IQS211B offers alternate hardware with identical firmware to the IQS211A. IQS211B hardware offers improved temperature response and low temperature range.


  • Pin compatible with IQS127/128/227/228/231A
  • Automatic Tuning Implementation (ATI)
  • On-chip movement detection algorithm
  • Forced activation when movement detected
  • Minimal external components
  • 25mm detection distance
  • Up to 200pF sensor load
  • I2C interface:
    • Standard I2C (polling)
    • I2C (polling) configuration at start-up with standalone runtime operation
    • I2C with wake-up
  • Standalone interfaces:
    • Dual output: Fixed threshold activation output & movement output
    • Dual output: Movement latch & movement output
  • Movement output & digital input
  • 1-Wire streaming interfaces:
    • 1-Wire data streaming & movement output
    • 1-Wire & CLK signal
  • Special configurations:
    • Activation based on capacitive load at power-on
    • Automatic threshold adjustment
  • Movement output selection: Pulse Frequency Modulation (PFM, default), Pulse Width Modulation (PWM), Latched, PWM combined with activation
  • Internal Capacitor Implementation (ICI)
  • Low power consumption: Sub-2uA modes available
  • Low power options:
    • Low power without activation
    • Low power within activation
    • Low power standby modes with proximity wake-up
  • Supply voltage: 1.8V to 3.6V
  • Low profile TSOT23-6 package


  • Wearable devices
  • Movement detection devices (fitness, anti-theft)
  • White goods and appliances
  • Proximity activated back lighting
  • Applications with long-term activation
  • Human interface devices
Let us help you implement your IQS211A/B.
We’ve done it before.
If you don’t believe us test it yourself.

Includes 1x IQS211A Shield board and 2x IQS211A Stamp module.
Connect Shield board and Stamp module to PC via CT210/A to evaluate proximity and touch functions with GUI.

 NOTE: CT210/A sold separately.

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