AT42QT1244-AUR

Overview

The AT42QT1244-AUR is a 24-key QMatrix FMEA touch sensor IC from Microchip Technology. It utilizes patented transverse charge-transfer technology with frequency hopping for stable sensing. The device supports up to 24 keys in a matrix layout and features an I2C slave interface operating at speeds up to 400 kHz. It operates on a power supply of +3 V to 5 V and includes self-calibration, auto drift compensation, noise filtering, and Adjacent Key Suppression (AKS). The component is housed in a 32-pin 7 × 7 mm TQFP package and is compliant with IEC/EN/UL60730 safety standards.

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
• Features FMEA compliant design with key failure detection and IEC/EN/UL60730 compliance
• Provides individual key sensitivity adjustment via I2C communication interface

Applications

• Class B and class C safety-critical products requiring FMEA compliance
• Domestic appliances utilizing plastic, glass, or composite panels
• Industrial control interfaces needing robust noise filtering and drift compensation

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm packaging type and RoHS status. Ensure the supplier provides valid traceability documents. Confirm that the component matches the required pinout and package dimensions before integration into the production line.

Selection Notes

Select this component when a high number of touch inputs are required within a single integrated circuit. It is suitable for designs demanding strict safety compliance and robust performance in electrically noisy environments. Consider the available I/O pins and matrix configuration requirements during the initial hardware architecture phase.

Part Context

This part belongs to the AT42QT1244 series of capacitance touch sensor ICs manufactured by Microchip Technology. It is designed specifically for matrix layout touch controls and integrates all necessary signal processing functions for stable operation under varying environmental conditions.

Replacement Considerations

Consult official Microchip documentation for verified substitute part numbers. Do not assume cross-compatibility with other series without verifying pinouts, electrical characteristics, and software support.