IQS231A-00004000-DNR

Overview

The IQS231A-00004000-DNR is a single-channel capacitive proximity and touch controller designed for SAR applications. It operates on a supply voltage range of 1.764V to 3.6V and features an I2C interface with configurable OTP settings. The device utilizes self-capacitance measurement technology with a resolution down to 0.02fF and supports loads up to 120pF. Sampling rates include 30Hz, 100Hz, 8Hz, and 4Hz. It offers standalone or I2C operation modes, movement detection, quick release functionality, and advanced temperature compensation.

Feature Summary

• Integrated SAR user interface with GPIO output options
• Quick release detection to prevent false triggers from remaining objects
• Advanced temperature and interference compensation for high RF environments
• Configurable sampling rates and failsafe heartbeat pulses

Applications

• SAR sensor integration
• On-ear detection in audio devices
• Hold detection for screen activation
• Movement sensing for anti-theft systems

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet revision to confirm package type and configuration bits. Ensure compatibility with existing I2C pull-up requirements and external capacitor values for VREG and VDDHI pins to prevent latch-up issues during ESD events.

Selection Notes

Select this component when a single-channel solution with integrated movement detection and SAR compliance features is required. Consider the IQS231B variant if improved low-temperature performance is necessary, as it shares identical firmware but offers different hardware characteristics.

Part Context

This part belongs to the Azoteq ProxSense series, specifically engineered for self-absorption rate (SAR) reduction in mobile devices. It replaces older discrete solutions by integrating the sensing engine, microprocessor, and non-volatile memory into a compact footprint.

Replacement Considerations

The IQS231B is a pin-compatible alternative with identical firmware but enhanced low-temperature response. Verify that the application does not require the specific temperature characteristics of the B variant before substituting.