QT118H-DG

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Interface - Sensor, Capacitive Touch

Capacitive touch sensors are a challenging yet popular way to input data from the environment. The capacitive sensing technology is mainly used for gesture detection, but it can also be used for other applications such as buttons and sliders. The QT118H-DG capacitive touch sensor module is a touch sensing solution based on the AD7278 touch controller developed by Texas Instruments. It is specifically designed for applications that require reliable sensing, high performance, low cost, and low power. The QT118H-DG module includes a touch sensor and an SPI interface. This application note reviews the application fields, advantages and working principle of the QT118H-DG sensor module.

Application Fields

The QT118H-DG sensor module is suitable for various applications, such as:

• Mobile phones
• Tablets
• Point of sale systems
• White goods
• Appliances
• Automotive systems

Advantages

The QT118H-DG touch sensing module offers some advantages over other touch sensing solutions. Some of the most important benefits include:

• Low power consumption: The QT118H-DG touch sensing module operates at low power consumption, which means that it can be used in mobile applications that require long battery life.
• High resolution: The QT118H-DG module offers high resolution touch sensing, allowing for accurate gesture recognition.
• Easy to use: The QT118H-DG module is easy to use and requires no additional programming or integration. It is plug and play.
• Low cost: The QT118H-DG module is a cost-effective solution compared to other capacitive touch solutions.

Working Principle

The QT118H-DG module uses the AD7278 touch controller developed by Texas Instruments to detect touch input. This controller is dedicated to capacitive touch sensing and works by measuring changes in capacitance. A capacitive touch sensor consists of several electrodes that are connected to an electronic circuit. When a user touches the surface of the sensor, their body capacitance mixes with the electrodes and changes the capacitance of the circuit. The AD7278 chip can sense these small changes in capacitance and accurately detect touch input.

The AD7278 chip is connected to the QT118H-DG module via an SPI interface. This interface is used to configure the chip and read out the touch data. The QT118H-DG will then send this data to the host processor, where it can be handled by the application software. The AD7278 touch controller also features a low power standby mode, allowing the host processor to be put into sleep mode if no touch input is detected for a certain period of time.

Conclusion

The QT118H-DG module is an excellent choice for applications that require reliable touch sensing. It is easy to set up, has low power consumption, is cost-effective, and offers high resolution touch sensing. The module is suitable for a wide range of applications, including mobile devices, point of sale systems, home appliances, automotive systems, and many others.

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