QT401-IS

Overview

The QT401-IS is a one-dimensional position sensor IC designed for human interfaces, utilizing Quantum’s patented charge-transfer methods. It operates on a single supply voltage ranging from 2.5V to 5.5V and features a SPI slave-mode interface for host communication. The device provides a 7-bit binary positional output (0 to 127) representing finger location along a resistive sensing strip. It supports synchronized and free-run acquisition modes with spread-spectrum modulation for noise immunity. Key outputs include DRDY, PROX, and DETECT pins. The component is housed in a 14-pin SOIC package.

Feature Summary

• Utilizes proprietary charge-transfer technology for capacitive sensing across a resistive element
• Supports both continuous slider tracking and discrete button interpretation via software mapping
• Features spread-spectrum burst mode operation to minimize electromagnetic interference
• Includes automatic self-calibration and drift compensation capabilities

Applications

• Automotive control panels
• Appliance user interfaces
• Lighting dimmer controls
• Menu bars for LCD displays

Procurement Notes

Verify the specific suffix IS against official Microchip Technology documentation to confirm the industrial temperature range and package variant. Confirm current availability status as distribution channels may list obsolete or end-of-life components. Ensure the ordering information matches the exact datasheet revision referenced in this summary.

Selection Notes

Select this component when a simple, low-cost linear touch interface is required without moving parts. It is suitable for designs using ITO overlays or custom resistive strips. Consider the power consumption trade-offs between synchronized and free-run modes based on system battery requirements and response time needs.

Part Context

The QT401 belongs to the QSlide family of touch controllers developed by QRG Ltd, now part of Microchip Technology. This series focuses on 1D position sensing rather than multi-touch matrix detection. It serves as a specialized solution for volume, speed, or menu navigation controls where standard potentiometers are impractical.

Replacement Considerations

Public confirmed substitute part numbers: None identified.