AT42QT1481-AU

Overview

The AT42QT1481-AU is a 48-key QMatrix FMEA touch sensor IC from Microchip Technology. It operates on a +4.75 to 5.25 V supply and features SPI (max 4 MHz) and UART interfaces within a 44-pin TQFP package measuring 10 x 10 mm. The device supports up to 48 keys with individually settable sensitivity, self-calibration, auto drift compensation, and noise filtering. Designed for safety-critical applications, it includes FMEA and IEC/EN/UL60730 compliant design features, adjacent key suppression, and key failure detection.

Feature Summary

• Supports up to 48 keys using patented transverse charge-transfer technology with frequency hopping
• Includes FMEA and IEC/EN/UL60730 compliant design features for safety-critical products
• Features self-calibration, auto drift compensation, and adjacent key suppression
• Provides both SPI slave and UART communication interfaces

Applications

• Class B and Class C safety-critical products requiring EN60730 compliance
• Multi-key capacitive touch panels with mixed key sizes and shapes
• Industrial control interfaces utilizing grounded metal adjacent to keys

Procurement Notes

Verify the component against official Microchip datasheet specifications to ensure authenticity. Confirm that the package matches the 44-pin TQFP form factor and that the operating voltage range aligns with system requirements. Check for RoHS compliance status and ensure proper handling procedures are followed due to moisture sensitivity classification.

Selection Notes

Select this IC when designing systems requiring high channel counts up to 48 keys with robust noise immunity. Ensure the host microcontroller supports either SPI or UART protocols for configuration and data retrieval. Verify that the application panel thickness and material compatibility meet the specified constraints for reliable sensing performance.

Part Context

This component belongs to the AT42QT1481 series of digital burst mode sensors designed specifically for QMatrix layout touch controls. It integrates all necessary signal processing functions to provide stable sensing under varying environmental conditions, allowing operation with minimal external components.

Replacement Considerations

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