AT42QT1481-ANR

Overview

The AT42QT1481-ANR is a 48-key QMatrix touch sensor IC from Microchip Technology, housed in a 44-pin TQFP package. It supports up to 48 keys using patented charge-transfer technology with frequency hopping. The device operates on a supply voltage of +4.75 V to +5.25 V and features SPI slave (max 4 MHz) and UART interfaces. It includes self-calibration, auto drift compensation, noise filtering, and adjacent key suppression. Designed for FMEA and IEC/EN/UL60730 compliance, it detects key failures and supports panel thicknesses up to 50 mm glass or 20 mm plastic.

Feature Summary

• Patented transverse charge-transfer sensing technology with frequency hopping for robust performance
• Integrated signal processing including self-calibration, auto drift compensation, and adjacent key suppression
• Dual interface support via SPI slave and UART for flexible host communication
• FMEA compliant design features with key failure detection capabilities

Applications

• Safety-critical products requiring IEC/EN/UL60730 compliance
• Multi-key touch control panels with mixed electrode shapes and sizes
• Interfaces behind thick panels such as glass or painted surfaces
• Systems requiring high noise immunity and adjacent metal compatibility

Procurement Notes

Verify the specific suffix 'ANR' against official Microchip documentation to confirm exact packaging and tape/reel specifications. Ensure the component source provides valid RoHS compliance data and matches the 44-pin TQFP physical dimensions. Cross-reference the part number with current datasheet revisions to avoid obsolete variants.

Selection Notes

Select this IC for applications requiring up to 48 independent touch keys with high reliability standards. It is suitable for designs needing FMEA compliance and operation under varying environmental conditions. Consider the required interface protocol (SPI or UART) and power supply constraints (+4.75V to +5.25V) during system architecture planning.

Part Context

The AT42QT1481 belongs to the AT42QT1481 series of capacitive touch sensor ICs by Microchip Technology. It is designed specifically for QMatrix layouts, offering a solution for complex touch interfaces. The device integrates all necessary signal processing functions to provide stable sensing across a wide variety of changing conditions.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing firmware and hardware interfaces if considering alternative sensors from the same manufacturer.