AT42QT1050-MMH

Overview

The AT42QT1050-MMH is a five-channel QTouchADC capacitive touch sensor IC manufactured by Microchip Technology. It supports configurations of one to five keys or up to four keys plus a guard channel. The device operates on a 1.8 V to 5.5 V supply and features an I2C slave interface with a maximum clock rate of 400 kHz. It utilizes patented spread-spectrum technology for noise suppression and includes signal processing functions such as self-calibration, auto-drift compensation, and Adjacent Key Suppression (AKS). The component is available in a 20-pin VQFN package.

Feature Summary

• Patented spread-spectrum QTouchADC charge-transfer technology provides enhanced noise immunity and suppresses RF emissions.
• Integrated signal processing includes self-calibration, auto-drift compensation, and configurable detection integrators.
• Supports Adjacent Key Suppression (AKS) technology allowing tightly spaced keys without loss of selectability.
• Features programmable Low Power modes supporting both Low Power and Deep Sleep states for energy efficiency.

Applications

• Consumer electronics requiring capacitive button interfaces
• Industrial control panels needing high noise immunity
• Appliances utilizing single-layer panel materials

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and temperature range. Ensure compatibility with I2C bus voltage levels and check for any recent Product Change Notifications regarding manufacturing sites or materials before finalizing procurement.

Selection Notes

Select this component when a solution supporting up to five independent touch inputs is required. Consider the 20-pin VQFN package for board space constraints. Evaluate the need for AKS groups and guard channels based on keypad density and environmental noise conditions.

Part Context

This part belongs to the AT42QT10xx series of QTouch sensor drivers from Microchip Technology. It is designed to replace mechanical switches in embedded systems, offering a software-configurable alternative to discrete touch sensing circuits while maintaining robust performance in electrically noisy environments.

Replacement Considerations

Direct replacements within the same family include the AT42QT1040 for reduced channel counts. Verify pinout compatibility and register map differences when substituting with other QTouch devices.