QT401-ISG

Overview

The QT401-ISG is a QSlide™ capacitive touch slider IC designed for one-dimensional human interface applications. It operates on a single supply voltage ranging from 2.5V to 5.5V and features a 7-bit binary integer positional output (0 to 127) derived from simultaneous sensing across a resistive element. The device utilizes an SPI slave-mode interface for host communication and supports both synchronized and free-run acquisition modes. It incorporates spread-spectrum modulation for noise immunity and includes dedicated PROX and DETECT output pins for proximity and touch detection.

Feature Summary

• Capacitive position sensing using patented charge-transfer methods across a resistive strip
• Spread-spectrum burst mode operation for superior electromagnetic compatibility
• Dual active-high outputs for proximity detection and touch status indication
• Host-controlled self-calibration with automatic drift compensation capabilities

Applications

• Appliance control interfaces such as volume or speed sliders
• Lighting controls including dimmer switches
• Automotive dashboard controls and menu bars
• Proximity wake-up sensors for displays in sleep mode

Procurement Notes

Verify the specific suffix ISG confirms the TSSOP-14 package and industrial temperature range (-40°C to +85°C). Confirm current availability status as this component may be subject to end-of-life notifications. Ensure ordering documentation matches the exact Microchip Technology part number to avoid substitution errors.

Selection Notes

Select this component for linear position sensing applications requiring low power consumption and high noise immunity. Evaluate the resistive slider element construction, ensuring appropriate capacitance values for the panel thickness. Consider the SPI interface requirements of the host controller and verify that the 7-bit resolution meets the application's precision needs.

Part Context

The QT401 belongs to the QSlide™ family of capacitive sensor ICs developed by Microchip Technology. This series focuses on creating simple, inexpensive one-dimensional touch interfaces without moving parts. The device integrates advanced signal processing to provide accurate finger tracking along a resistive strip, distinguishing it from standard button-based touch controllers.

Replacement Considerations

No public confirmed substitute part numbers are available.