QT1080-ISG

Overview

The QT1080-ISG is an eight-key capacitive touch sensor IC based on Quantum’s patented charge-transfer technology. It operates on a single supply voltage ranging from 2.8V to 5.0V and features independent sensing fields for up to eight electrodes. The device includes AKS™ Adjacent Key Suppression, spread-spectrum burst technology for noise rejection, and a SYNC/LP pin for synchronization or low-power operation. It offers direct per-key outputs or binary-coded outputs and supports simplified configuration modes. Available in 32-QFN and 48-SSOP packages, it provides self-calibration and drift compensation for reliable human interface applications.

Feature Summary

• Patented charge-transfer sensing technology enables robust detection through dielectric materials like glass or plastic.
• AKS™ Adjacent Key Suppression prevents multiple key responses from single touches or water films.
• Spread-spectrum burst operation minimizes external noise susceptibility and limits RF emissions.
• Self-calibrating design with automatic drift compensation ensures long-term reliability without manual adjustments.

Applications

• Pointing devices
• Remote controls
• PC peripherals
• Television controls
• Mobile phones

Procurement Notes

Verify the specific package variant required, as the QT1080 family includes both 32-QFN and 48-SSOP options. Confirm that the ISG suffix corresponds to the correct temperature range and packaging specifications for your design. Ensure all option resistors are correctly placed if utilizing full options mode rather than simplified mode. Cross-reference the datasheet revision to confirm compatibility with existing schematic designs.

Selection Notes

Select this component when an eight-channel capacitive touch solution is needed with minimal host controller overhead. Choose direct output mode for simple interfaces or binary coded mode to reduce pin count. Utilize the simplified mode configuration to reduce external component count if advanced tuning is not required. Consider the LP mode for battery-operated applications requiring microamp-level current drain during idle states.

Part Context

The QT1080 belongs to the QTouch™ sensor IC family developed by Quantum Research Group and distributed by Microchip Technology. It utilizes proprietary charge-transfer principles distinct from older mutual capacitance technologies. The device is designed to replace mechanical switches in consumer electronics, offering high value through software-configurable sensitivity and robust environmental compensation features.

Replacement Considerations

Public confirmed substitute part numbers: None identified in verified documentation.