QT411-ISSG

Overview

The QT411-ISSG is a linear capacitive touch slider sensor IC from Microchip Technology's QSlide™ series, housed in a 14-pin TSSOP package. It operates on a single supply voltage ranging from 2.5V to 5.5V with a typical supply current of 750µA. The device features a 7-bit resolution output (0-127) representing angular position across three sensing channels. It utilizes an SPI slave interface for communication and supports both synchronized and free-run acquisition modes. The operating temperature range spans from -40°C to +85°C.

Feature Summary

• Linear finger-touch capacitive slider control using robust charge-transfer sensing
• Self-calibration and drift compensation capabilities without endpoint calibration requirements
• Spread-spectrum operation for optimal EMC compliance and noise immunity
• Compatible with clear ITO overlays on LCD constructions

Applications

• Automotive controls
• Climate controls
• Appliance controls
• Personal electronics

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific ordering suffix matches the required package variant. Check for Product Change Notifications regarding manufacturing updates. Ensure compliance with RoHS3 specifications as indicated in official documentation. Validate that the part status aligns with current availability constraints.

Selection Notes

Select this component for applications requiring linear position sensing via a resistive element. Ensure the host controller supports SPI slave mode communication. Verify that the panel thickness and dielectric constant allow for adequate capacitive coupling. Consider the power supply stability requirements to prevent acquisition errors during sleep mode transitions. Evaluate the need for spread-spectrum modulation to mitigate environmental noise interference.

Part Context

The QT411-ISSG belongs to the QSlide™ family of touch sensor ICs designed by Quantum Research Group and distributed by Microchip Technology. It serves as an enhanced replacement for the QT401, offering improved stability against temperature variations and environmental influences. The device eliminates the need for special endpoint calibration while maintaining high positional accuracy through mathematical analysis of synchronous sensing channels.

Replacement Considerations

The QT411 is explicitly designed to replace the QT401. Note that the QT411 lacks the proximity detection function present in the QT401. Designers must adjust firmware to accommodate the absence of proximity sensing and ensure compatibility with the new calibration and drift compensation behaviors.