IQS318511QFR

Overview

The IQS318511QFR is a single-channel self-capacitive touch sensing controller from the Azoteq ProxFusion series, housed in a QFN20 package. It operates on a supply voltage range of 1.71 V to 3.6 V and supports an I²C interface with Fast Mode Plus speeds up to 1 MHz. The device integrates automatic tuning, noise filtering, and debounce functions. It features configurable channel sensitivity, sampling period, threshold, and charge transfer frequency via external input pins. The IC includes an internal regulated supply output and supports one-time programmable settings for custom configurations.

Feature Summary

• Supports single-channel self-capacitive sensing with integrated DYCAL™ 2 dynamic calibration UI for long-term detection stability.
• Provides flexible configuration options through external input pins for adjusting sensitivity, sampling rate, and thresholds without software intervention.
• Includes built-in signal processing capabilities such as automatic tuning, noise filtering, and hysteresis to ensure reliable operation in varying environments.

Applications

• Wear detection applications requiring continuous monitoring
• Lid open-close switch detection
• Backlight activation triggers

Procurement Notes

Verify the specific ordering suffix against the manufacturer's datasheet to confirm the exact functional variant and package type. Ensure that the procurement documentation matches the required I²C addressing and pinout specifications for the QFN20 footprint. Cross-reference the revision level to guarantee compatibility with existing design files and application notes.

Selection Notes

Select this component when a single-channel self-capacitive solution with low power consumption is required. The QFN20 package offers sufficient pin access for debugging and configuration inputs. Consider the operating temperature range and supply voltage requirements to ensure compatibility with the target system environment and power budget constraints.

Part Context

This part belongs to the IQS318 family of ProxFusion controllers, which are designed for both standalone and I²C proximity or touch sensing. The IQS318 series supports various sensor types including inductive switches, buttons, and capacitive switches, offering a versatile platform for embedded sensing applications across consumer and industrial electronics.

Replacement Considerations

Direct replacements within the IQS318 family include IQS318510QFR (I²C version) or IQS318513CSR (standalone version). Verify pin compatibility and firmware requirements before substitution. Other Azoteq sensors may require significant circuit redesign due to differing interface protocols or channel counts.