AT42QT2100-MUR

Overview

The AT42QT2100-MUR is a Microchip Technology capacitive touch sensor IC supporting up to seven independent keys and one slider or wheel. It operates on a 2.0 V to 5.5 V supply within a -40°C to 85°C temperature range. The device utilizes a full-duplex SPI interface with a maximum clock rate of 750 kHz, supplemented by DRDY and CHANGE status pins for efficient host communication. Key technical features include patented spread-spectrum charge-transfer technology, self-calibration, automatic drift compensation, and Adjacent Key Suppression (AKS). The component is housed in a 32-pin 5 x 5 mm MLF package.

Feature Summary

• Patented spread-spectrum charge-transfer technology provides superior noise rejection and robust operation.
• Integrated signal processing includes self-calibration, automatic drift compensation, and noise filtering.
• Supports configurable proximity sensing and hardware-based moisture tolerance improvements.
• Features Adjacent Key Suppression (AKS) to prevent false triggers from closely spaced electrodes.

Applications

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

Procurement Notes

Verify the specific ordering suffix against official Microchip documentation to confirm package type and reel specifications. Ensure compatibility with standard SPI master controllers and validate that the 32-pin MLF footprint matches the target PCB layout. Confirm RoHS compliance status through current manufacturer declarations prior to procurement.

Selection Notes

Select this component when designing systems requiring multiple discrete touch keys combined with linear or rotary scroll functionality. It is suitable for applications needing high noise immunity through spread-spectrum techniques. Consider external Cs capacitor values to tune sensitivity for specific panel thicknesses and electrode sizes.

Part Context

This part belongs to the QTouch family of capacitive sensing solutions from Microchip Technology. It serves as a dedicated ASIC for human-machine interfaces, offloading complex signal processing tasks from the main microcontroller. The device simplifies design by integrating advanced algorithms for drift and noise management directly into the silicon.

Replacement Considerations

Consult Microchip's official product selector for direct pin-compatible alternatives within the AT42QT series. Verify channel counts and interface requirements when evaluating substitutes such as the AT42QT1070 or AT42QT1245 families.