AT42QT1245-MUR

Overview

The AT42QT1245-MUR is a 24-key capacitive touch sensor IC from Microchip Technology's QMatrix series. It utilizes patented transverse charge-transfer technology with frequency hopping for robust sensing. The device supports up to 24 keys via an SPI interface and operates on a +3 V to +5 V power supply. It features self-calibration, auto drift compensation, noise filtering, and Adjacent Key Suppression (AKS). Designed for safety-critical applications, it includes FMEA compliant design features and IEC/EN/UL60730 compliance. The component is available in a 32-pin 7x7 mm TQFP package.

Feature Summary

• Supports up to 24 keys using patented transverse charge-transfer technology with frequency hopping
• Includes signal processing functions such as self-calibration, auto drift compensation, and Adjacent Key Suppression
• Designed for safety-critical products with FMEA and IEC/EN/UL60730 compliance features
• Detects and reports key failures including line shorts and capacitor faults

Applications

• Class B and class C safety-critical products
• Domestic appliances requiring FMEA compliance
• Touch control interfaces with mixed key sizes and shapes
• Applications requiring detection of electrode or wiring faults

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and reel specifications. Ensure compatibility with host system voltage levels and SPI interface requirements. Confirm RoHS compliance status and moisture sensitivity level prior to assembly. Check for any recent Product Change Notifications regarding marking or assembly site changes.

Selection Notes

Select this component for designs requiring up to 24 independent touch inputs with high noise immunity. Consider the 32-pin TQFP package for board space constraints. Evaluate the need for FMEA and safety certification features if deploying in regulated environments. Ensure PCB layout allows for short traces between the chip and matrix components to minimize EMC issues.

Part Context

The AT42QT1245 belongs to the AT42QT12xx series of capacitive touch sensors. It is part of Microchip's QMatrix family, which specializes in matrix-based touch sensing solutions. This series is designed to replace mechanical switches in various consumer and industrial applications, offering reliable touch detection through digital signal processing.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.