AT42QT1011-MAHR

Overview

The AT42QT1011-MAHR is a single-channel capacitive touch sensor IC from Microchip Technology, utilizing patented spread-spectrum charge-transfer technology. It operates within a supply voltage range of 1.8 V to 5.5 V and features an active-high digital output. The device supports configurable operation as either a single key or a proximity sensor. It incorporates self-calibration, auto drift compensation, and noise filtering for stable sensing. The component is housed in an 8-pin UDFN/USON package with a bare pad.

Feature Summary

• Patented spread-spectrum charge-transfer technology reduces RF emissions and EMI susceptibility while maintaining excellent response times.
• Integrated signal processing includes self-calibration, asymmetric drift compensation, and a consensus filter requiring four consecutive detections before activation.
• Configurable run modes allow selection between Fast mode for maximum speed, Low Power mode for energy efficiency, and SYNC mode for external clock synchronization.
• HeartBeat health indicator superimposed on the output pin allows monitoring of device operational status.

Applications

• Control panels and industrial interfaces
• Consumer appliances and home automation
• Proximity sensor applications
• Toys and lighting controls

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and tape-and-reel specifications. Ensure compatibility with the required operating temperature range and supply voltage levels for the target application environment.

Selection Notes

Select this component for designs requiring a single-channel touch solution with minimal external components. Consider the trade-off between sensitivity and response time when choosing the sample capacitor value. Ensure PCB layout guidelines are followed to minimize stray capacitance and maximize noise immunity.

Part Context

This part belongs to the AT42QT1011 series of QTouch sensor ICs. It is designed to replace mechanical switches in human-machine interfaces. The MAHR suffix indicates the specific packaging configuration available for surface-mount assembly.

Replacement Considerations

Direct replacements include other parts within the AT42QT1011 family such as the AT42QT1011-MAH. Verify pinout compatibility and software configuration requirements when substituting variants.