IQS318200QFR

Overview

The IQS318200QFR is a single-channel standalone and I2C proximity or touch sensing controller from the Azoteq ProxFusion series. It supports inductive snap button applications with configurable sensitivity, sampling period, and threshold via external input pins. The device operates on a supply voltage of 1.71 V to 3.5 V and features automatic tuning, noise filtering, debounce, and hysteresis. It includes an I2C debugging interface supporting Fast Mode Plus up to 1 MHz. The component is housed in a QFN20 package measuring 3 mm x 3 mm x 0.55 mm with a 0.4 mm pitch.

Feature Summary

• Supports single channel I2C or standalone inductive snap button functionality
• Configurable channel sensitivity, sample period, threshold, and charge transfer frequency using external input pins
• Integrates automatic tuning, noise filtering, debounce, and hysteresis functions
• Includes I2C debugging interface with IRQ/RDY support

Applications

• Inductive snap buttons
• General-use button/switch
• Wear detection
• Backlight activation
• Tamper switch (release detection)

Procurement Notes

Verify the specific suffix 'QFR' corresponds to the QFN20 package configuration as defined in the manufacturer's ordering code documentation. Confirm that the application requires the IQS318-2xx order code variant for inductive snap button functionality. Ensure design compatibility with the specified 1.71 V to 3.5 V supply range and I2C interface requirements before procurement.

Selection Notes

Select this component for designs requiring a single-channel solution for inductive snap buttons. The IQS318-2xx family is specifically tuned for snap dome profiles rather than simple threshold crossing. Consider the QFN20 package if board space allows for a 3x3 mm footprint. Verify that the required charge transfer frequency settings align with the available InputA pin configurations for the -2xx series.

Part Context

The IQS318200QFR belongs to the IQ Switch ProxFusion series by Azoteq. This series provides low-power sensing controllers for proximity and touch applications. The IQS318 model specifically offers both standalone and I2C modes, allowing flexibility in system integration. The -2xx suffix indicates the inductive snap button application profile within the product line.

Replacement Considerations

Direct replacements must match the IQS318-2xx inductive snap button profile and QFN20 package. Other IQS318 variants like IQS318101QFR differ in function (inductive button vs snap button) and are not direct substitutes without functional re-evaluation.