IQS231B
The IQS231A/B ProxSense® IC is a self-capacitance controller designed for applications where an awake/activate-on-proximity function is required. The IQS231A/B is an ultra-low-power solution that uses unique release and/or movement detection for applications that require long-term detection. The IQS231A/B operates standalone or I2C and features configuration via OTP (One Time Programmable) bits. Switching from I2C to standalone during runtime is also possible to access all settings while offering the simplicity of a standalone output.
IQS231B offers alternate hardware with identical firmware to the IQS231A. IQS231B hardware offers improved temperature response and a low temperature range.
Main Features
- Integrated SAR user interface offering a simple GPIO output.
- Quick release detection – effectively prevent false triggers from remaining.
- Quick release sensitivity options.
- Wide range of control for sensing in high-power RF environments.
- Pin compatible with devices of the same package type (all ProxSense® TSOT23-6 devices, IQS211A WLCSP-8 device).
- 1.8 V (-2%) to 3.6 V input voltage.
- Capacitive resolution down to 0.02 fF.
- Capacitive load capability up to 120 pF.
- External threshold adjustment pin (minimize need for pre-empted OTP adjustments).
- Minimal external components (direct input strap).
- Standalone failsafe mode (backwards compatible failsafe output, short pulses on output to indicate operational device).
- Default OTP options focus on safety and passing SAR lab qualification; OTP changes offer performance advantages.
- I2C interface option (improved compatibility).
- Extended controls in I2C mode (setup in I2C, runtime with standalone output).
- Optional input for synchronised implementations (input to instruct IC when to sense).
- Synchronisation output – failsafe pulses may be used by the master to synchronise on. Sensing is done after each pulse.
- Synchronisation input – Sensing is only done while Sync input is low.
- Low power sensing: 30 Hz (default), 100 Hz, 8 Hz, 4 Hz (sub 6 µA mode).
- Constant sampling rates during all power modes with rapidly debounced output changes.
- Advanced temperature & interference compensation option.
Applications
- SAR sensor
- Integrated hybrid designs (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 IQS231B.
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Includes 1x IQS231B Shield board, 3x IQS231B Stamp module and 10x IQS231B 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.
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.
