AT42QT2100-AUR

Overview

The AT42QT2100-AUR is a capacitance touch sensor IC from Microchip Technology, part of the QTouch series. It supports up to seven independent keys and one slider or wheel using patented spread-spectrum charge-transfer technology. The device operates on a 2.0 V to 5.5 V supply and features an SPI interface with DRDY and CHANGE status pins. It includes self-calibration, autodrift compensation, noise filtering, and Adjacent Key Suppression (AKS). Available in 32-pin MLF and TQFP packages, it is designed for robust operation through dielectrics up to 15 mm thick.

Feature Summary

• Patented spread-spectrum charge-transfer technology for superior noise rejection
• Integrated signal processing including self-calibration, autodrift compensation, and noise filtering
• Supports up to seven discrete keys plus one spatially interpolated slider or wheel
• Hardware-based moisture tolerance and hand proximity sensing capabilities

Applications

• Portable electronic devices requiring low-power capacitive interfaces
• Domestic appliances and audio/video equipment control panels
• PC peripherals and office equipment user interfaces

Procurement Notes

Verify the specific package variant against project requirements, as the AT42QT2100 family includes both 32-pin 5x5 mm MLF and 32-pin 7x7 mm TQFP options. Confirm that the ordering suffix corresponds to the desired physical footprint and RoHS compliance status before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring multiple touch inputs alongside a scroll function. Ensure the host microcontroller supports full-duplex SPI communication. Evaluate the required panel thickness and electrode size to determine appropriate Cs capacitor values for optimal sensitivity tuning across all channels.

Part Context

This component belongs to the AT42QT1xxx/AT42QT2xxx QTouch family of dedicated capacitive touch controllers. These ICs are engineered to offload complex touch sensing algorithms from the main processor, providing a cost-effective solution for implementing reliable human-machine interfaces in embedded applications.

Replacement Considerations

Public confirmed substitute part numbers: AT42QT2100-MUR.