AT42QT1481-AN

Overview

The AT42QT1481-AN is a 48-key QMatrix FMEA IEC/EN60730 touch sensor IC manufactured by Microchip Technology. It supports up to 48 keys using patented transverse charge-transfer technology with frequency hopping. The device operates on a +4.75 V to +5.25 V supply and features SPI (4 MHz max) and UART interfaces. It includes self-calibration, auto drift compensation, noise filtering, and adjacent key suppression. The component is housed in a 44-pin 10 × 10 mm TQFP package.

Feature Summary

• Supports up to 48 keys with individually settable sensitivity via serial interface commands.
• Incorporates FMEA compliant design features for safety-critical applications.
• Provides signal processing including self-calibration, auto drift compensation, and noise filtering.
• Compatible with grounded metal immediately next to keys.

Applications

• Class B and Class C safety-critical products
• IEC/EN/UL60730 compliant designs
• FMEA compliant systems

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and environmental ratings. Confirm that the selected variant matches the required interface and compliance standards for your application. Ensure compatibility with the host system's voltage levels and communication protocols before finalizing procurement.

Selection Notes

Select this component when designing systems requiring high reliability and safety certification such as IEC/EN60730 or FMEA compliance. Consider the 48-key capacity and the need for robust signal processing under varying environmental conditions. Evaluate the power supply requirements of +4.75 V to +5.25 V and the available interface options.

Part Context

The AT42QT1481 belongs to the AT42QT1481 series of capacitive touch sensor ICs from Microchip Technology. It is designed specifically for QMatrix layout touch controls and integrates all necessary signal processing functions. The device allows for stable sensing across a wide variety of changing conditions with minimal external components.

Replacement Considerations

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