AT42QT2640-AUR

Overview

The AT42QT2640-AUR is a digital burst-mode touch sensor IC designed for QMatrix layouts, supporting up to 64 keys and eight sliders or wheels with 8-bit resolution. It utilizes patented transverse charge-transfer technology with frequency hopping for robust sensing. The device operates on a 4.75 V to 5.25 V supply and features an SPI slave interface with a maximum clock of 4 MHz. Packaged in a 44-pin 10 × 10 mm TQFP, it includes self-calibration, auto drift compensation, noise filtering, and Adjacent Key Suppression (AKS). It supports IEC/EN/UL60730 compliance through FMEA-compliant design features.

Feature Summary

• Supports QMatrix layouts with up to 64 keys and eight independent sliders or wheels.
• Incorporates patented transverse charge-transfer technology with frequency hopping.
• Includes signal processing functions such as self-calibration, auto drift compensation, and noise filtering.
• Features FMEA-compliant design capabilities for safety-critical product applications.

Applications

• Class B and Class C safety-critical products requiring IEC/EN/UL60730 compliance.
• Domestic appliances utilizing grounded metal adjacent to keys.
• Touch panels with panel thicknesses up to 50 mm glass or 20 mm plastic.

Procurement Notes

Verify the component against official Microchip Technology datasheet documentation to confirm authenticity. Ensure the ordering suffix matches the required tape and reel packaging configuration. Cross-reference the part number with authorized distributor records to validate current availability status and manufacturing origin details.

Selection Notes

Select this IC for designs requiring high channel counts and complex electrode geometries. Ensure the host system can manage the SPI interface and interpret FMEA test results for safety compliance. Verify that the power supply provides clean voltage within the specified range to maintain analog reference stability.

Part Context

This component belongs to the AT42QT2640 series, which is specifically engineered for QMatrix touch control applications. It represents a generation of sensors capable of scanning the touch matrix at higher speeds than previous devices, enhancing performance under heavy noise conditions while maintaining low power consumption.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.