QT110A-ISG

Overview

The QT110A-ISG is a capacitive touch sensor IC from the QProx series, manufactured by Microchip Technology. It features an 8-SOIC package and operates on a single supply voltage ranging from 2.5V to 5.5V. The device consumes approximately 26µA of current during operation and supports a working temperature range of -40°C to 85°C. It provides one channel for button sensing with up to 1 LED drive output. The component is marked as Not Recommended for New Designs.

Feature Summary

• Projects a touch button interface through any dielectric material
• Provides 100% autocalibration throughout the device lifecycle without manual adjustments
• Includes direct drive capability for piezo sounders to generate tactile click feedback
• Features a HeartBeat health indicator on the output pin

Applications

• Replacement for legacy QT110 devices in existing designs
• Low power consumer electronics requiring simple touch interfaces
• Battery-operated appliances utilizing minimal active external components

Procurement Notes

Verify that the specific application does not require new design implementation, as this component is explicitly marked Not Recommended for New Designs. Confirm compatibility with existing QT110 layouts, noting that sensitivity differences may necessitate capacitance adjustments. Ensure local Quantum or Atmel representatives are consulted for migration plans if transitioning from older hardware versions.

Selection Notes

Select this part only when replacing obsolete QT110 units where form, fit, and function must remain identical. Evaluate electrode design carefully, as the QT110A exhibits higher sensitivity than its predecessor. Adjust Cs capacitance values downward by 10 to 60 percent or increase Cx loading to match previous performance levels. Avoid using this component for fresh product development cycles.

Part Context

This integrated circuit belongs to the QProx family of capacitive sensors produced by Microchip Technology. It serves as a Flash version replacement for the original QT110 model. While maintaining electrical compatibility, it offers improved cost efficiency but requires specific layout modifications due to increased sensitivity characteristics compared to the legacy device.

Replacement Considerations

Public confirmed substitute part numbers: QT110.