AT42QT2640-AU

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The AT42QT2640-AU is an application-specific integrated circuit (ASIC) targeted at capacitive touch sensing. It offers a standalone solution to detect changes in the electrostatic coupling between an input pad and an external environment (e.g. a human finger).

The AT42QT2640-AU is a touch-sensing input device which uses a capacitance sensing algorithm to measure the electrostatic coupling between an input and an external reference object. This can then be used to determine whether the contact is made with a finger or some other object. The device is optimised for the detection of finger movement on a sensing pad, so it can be used to detect finger presses, slides, flips and complex gestures. It has a unique \'adaptive threshold\' mode which is able to automatically adjust the detection sensitivity, so it can be used in applications which require precise movement detection.

The AT42QT2640-AU has a programmable 8-bit SAR ADC and a 16-bit CRC processor at its core. These are used to perform complex signal processing algorithms, such as sample and compare mean, noise reduction, signal multipling and hysteresis. These algorithms allow the device to accurately measure the capacitance change of an external reference object. The device also has a flexible GPIO system with the ability to be programmed through a dedicated I2C interface for a broad range of applications.

The AT42QT2640-AU is well suited for applications which require dependable and precise touch sensing such as mobile phones, tablet PCs and media players. It is a highly integrated device which offers low power consumption and a small board footprint, making it ideal for handheld and portable applications. The device can also be used in industrial and automotive applications, such as vending machines and automotive infotainment systems.

The AT42QT2640-AU is a simple, cost-effective and reliable solution for capacitive touch sensing applications. It provides designers with a standalone solution for finger movement detection. With its advanced signal processing algorithms and flexible GPIO system, the device offers a high level of accuracy and precision. This makes it suitable for a broad range of capacitive sensing applications in both the consumer and industrial markets.

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