QT1101-ISG

Overview

The QT1101-ISG is a ten-key capacitive touch sensor IC utilizing patented charge-transfer technology. It supports up to ten independent sensing fields through dielectric materials like glass or plastic. The device operates on a single supply voltage ranging from 2.8V to 5.5V and features automatic self-calibration upon power-up. It includes Adjacent Key Suppression (AKS) to prevent multiple key activation and spread spectrum burst technology for noise rejection. Communication is handled via a serial interface with auto baud rate detection, supporting one-wire or two-wire configurations.

Feature Summary

• Patented charge-transfer design enables robust touch detection through various dielectrics
• Integrated AKS function suppresses adjacent key interference for accurate input
• Spread spectrum operation provides superior noise immunity and low emissions
• Automatic self-calibration ensures reliable performance without manual adjustment

Applications

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

Procurement Notes

Verify the specific suffix ISG corresponds to the required package type and temperature range before ordering. Confirm that the component status aligns with long-term availability requirements, as older sensor models may have limited production runs. Ensure all option resistors are correctly selected to match the desired operating mode.

Selection Notes

Select this model when a high channel count of ten keys is required in a compact form factor. Consider the simplified mode if fewer configuration resistors are preferred for board space reduction. Evaluate the need for AKS functionality based on keypad density and potential for multi-touch errors. Verify compatibility with host microcontroller serial interfaces for either one-wire or two-wire data transmission.

Part Context

This component belongs to the QTouch family of capacitive sensor controllers from Microchip Technology. It represents an evolution in charge-transfer sensing, offering higher integration than earlier discrete solutions. The device is designed to replace mechanical switches in human-machine interfaces, providing durability and design flexibility for consumer electronics and industrial control panels.

Replacement Considerations

Direct replacements should be sought within the same QTouch series or newer generations with compatible pinouts. Verify that substitute parts support the required number of channels and similar voltage ranges. Check for updated packaging options if the original SOIC or SSOP packages are no longer available.