IQS318101QFR

Overview

The IQS318101QFR is a single-channel standalone inductive button controller from the Azoteq ProxFusion series, housed in a QFN-20 package measuring 3 mm x 3 mm x 0.53 mm. It operates on a supply voltage of 1.71 V to 3.5 V and supports an operating temperature range of -40°C to +85°C. The device features an I2C debugging interface with IRQ/RDY support up to Fast Mode Plus (1 MHz). Key electrical characteristics include a typical active power consumption of 4.3 µA at 3.3V with InputC floating and a sampling period of 200. It integrates automatic tuning, noise filtering, debounce, and hysteresis for reliable inductive sensing.

Feature Summary

• Standalone inductive button functionality with automatic recovery from latch-up states
• Configurable sensitivity, sampling period, threshold, and charge transfer frequency via external input pins
• Integrated signal processing including automatic tuning, noise filtering, debounce, and hysteresis

Applications

• General-use inductive buttons requiring automatic recovery
• Wear detection systems
• Backlight activation controls
• Tamper switches with release detection

Procurement Notes

Verify the specific order code suffix against the manufacturer's datasheet to confirm the exact functional configuration, as different suffixes within the IQS318 family offer distinct user interfaces and capabilities. Ensure that the QFN-20 package dimensions and pinout align with the target PCB footprint design requirements before finalizing procurement.

Selection Notes

Select the IQS318101QFR when a standalone inductive button solution without the DYCAL™ 2 UI is required. This model is suitable for applications where the button must recover automatically if it becomes latched accidentally due to harsh environmental conditions. Consider alternative order codes if long-term activation or capacitive sensing is needed instead.

Part Context

The IQS318101QFR belongs to the IQS318-1xx series, which is designated for single-channel I2C or standalone inductive button applications. Unlike the 0xx and 5xx series, this variant does not integrate the DYCAL™ 2 dynamic calibration user interface. It is part of the broader ProxFusion family designed for low-power proximity and touch sensing controllers.

Replacement Considerations

Direct replacements within the same package and function are limited to other IQS318-1xx variants with compatible pinouts. Verify if the IQS318100CSR (WLCSP-11) or IQS318100DFN (DFN-12) can be adapted if package changes are permissible, noting that these require schematic and layout modifications.