Microchip provides a recommended PCB layout in the AT42QT2640-AUR datasheet, which includes guidelines for component placement, routing, and grounding. Additionally, it's recommended to follow general PCB design best practices for capacitive touch sensors, such as using a solid ground plane, minimizing noise, and keeping sensitive signals away from high-frequency signals.
Calibration of the AT42QT2640-AUR involves adjusting the sensitivity and threshold settings to optimize touch performance. Microchip provides a calibration procedure in the datasheet, which involves measuring the sensor's output voltage and adjusting the settings accordingly. Additionally, the AT42QT2640-AUR has an auto-calibration feature that can be enabled to simplify the calibration process.
The AT42QT2640-AUR supports up to 26 touch points, making it suitable for a wide range of touch-based applications, including touchpads, touchscreens, and gesture-recognition systems.
The AT42QT2640-AUR has built-in noise filtering and interference rejection capabilities, including a noise cancellation algorithm and a spread-spectrum clocking scheme. Additionally, the device has a high signal-to-noise ratio (SNR) and a low noise floor, making it suitable for use in noisy environments.
The AT42QT2640-AUR has a low power consumption of typically 12.5 mA in active mode and 1.5 μA in sleep mode, making it suitable for battery-powered applications. The device also has a power-down mode that can be used to further reduce power consumption.
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About Microchip
Microchip Technology Inc. is a leading manufacturer of microcontrollers and semiconductor devices for a wide range of applications in the aerospace, automotive, consumer electronics, industrial, and medical industries. Alongside a comprehensive product portfolio, Microchip Technology Inc. also provides easy-to-use development tools that enable engineers to create optimal designs quickly with minimal iterations to reduce risk while lowering total system costs to market. Headquartered in Chandler, Arizona, th
