AT42QT1481-AU

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AT42QT1481-AU capacitive touch controller is a single-pin QT device specifically designed for applications requiring compact, low-pin-count and cost effective solutions. It interfaces with a single-pin I/O to measure changes in capacitance close to the surface of the sensing area, then translates them into digital output.

The main application field of AT42QT1481-AU is its use on low-cost handsets or wearables to enable capacitive touch buttons. It can also be used in various consumer goods such as appliances, lighting and white goods. It is also suitable for medical and medical-related systems, making it an ideal choice for a broad range of consumer and industrial applications, where cost and compactness are important.

The AT42QT1481-AU includes all necessary hardware and software functions needed to detect and debounce capacitive touch-control with input capacitance ranging from 0.250pF to 15.0nF. It features an integrated dutycycle control system that significantly reduces power consumption and improves responsiveness.

In terms of working principle, AT42QT1481-AU is based on a charge transfer technique. The controller uses a precisely controlled integrated oscillator, which generates an AC signal that is modulated by the change in capacitance as a result of a touch action. The controller then digitizes the capacitance change via a high-resolution integrator, and detects the finish of the charge transfer when the oscillator signal has been modulated by the same amount that it has been initially set to.

Once the charge transfer is finished, the controller produces a finger-down output signal, which can be used to trigger an action specified by the user. To ensure robustness, the controller also improves noise immunity by periodically averaging the capacitance values. It also has adjustable sensitivity that can be optimized depending on the application, as well as configurable operation modes.

AT42QT1481-AU is thus a cost-effective, low-power and easy-to-use capacitive touch controller solution that can be adapted to various consumer, industrial and medical applications. This makes it a suitable choice for those applications that require reliable and accurate touch detection with minimum power consumption.

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