MCHPAT42QT1040-MMHR
Overview
The AT42QT1040-MMHR is a dedicated four-channel capacitive touch controller designed for creating reliable touch buttons with minimal external components. It utilizes Microchip patented spread-spectrum charge-transfer technology to provide high noise immunity and features Adjacent Key Suppression (AKS) to prevent false triggers from closely spaced sensors. Operating over a wide 1.8V to 5.5V range, it provides direct pin-per-key outputs for easy integration into existing digital logic without complex serial communication.
Why Choose This Part
This IC offers automatic self-calibration and drift compensation, ensuring consistent sensitivity even as environmental conditions or surface contaminants change. Its Adjacent Key Suppression (AKS) technology is a significant advantage for compact designs, as it intelligently determines which sensor has the strongest signal to avoid multiple key presses.
Applications
Key Specifications
Getting Started
To evaluate this sensor, use the AT42QT1040 evaluation kit or prototype with the 20-VQFN package by connecting up to four sense electrodes to the SNS pins using series resistors for ESD protection. No firmware development is required for basic operation as the device uses a simple pin-per-key output hardware interface. Ensure the thermal pad is correctly soldered and the bypass capacitor is placed close to the VDD pin for stable performance.
