ADS7846EG4

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The ADS7846EG4 is a fully integrated, low power consumption touch screen controller designed to provide direct connectivity to a single- and multi-function touch screen panel with minimal external components. This application field and working principle is suitable for use in a wide variety of applications, including digital TV, desktop systems, internet access, mobile computing, and retail point-of-sale equipment.

Overview

The ADS7846EG4 touch controller contains an integrated ARM Cortex-M4 core and dedicated hardware to provide a high level of performance and power efficiency. It supports single- and multi-function user interfaces and supports a variety of configurations, including multiple display resolutions, multiple bus interfaces, and low-power modes for embedded applications. With multiple LCD connection options, the ADS7846EG4 is designed to reduce the total BOM count.

Technical Specifications

• Operating Voltage: 2.7V to 3.6V
• Interface: TS/I2C
• Input Resolution: 13-bit
• Scan Frequency: up to 80kHz
• BUS Output: 8/16/24/32-bit
• Power Consumption: 10 mW (Sleep Mode)
• Standby Current: 2.5 μA (Typ.)

Features

• Secure access to touch sensing data
• Low power operation for portable devices
• Integrated lock-in amplifier for noise filtering
• High scan rate to achieve fast response time
• Flexible control settings for custom performance
• Multiple LCD connection support

Application Field and Working Principle

The working principle of the ADS7846EG4 is based upon capacitive sensing, where a conductive plate of electrode material is placed on the outer surface of a display or touch screen. When a finger touches the plate, the capacitance of the plate is changed by the finger and a change in voltage is measured. This voltage change is then converted into digital data points and sent to a controller for further action.

The ADS7846EG4 is ideally suited for a wide range of touch screen applications, including industrial, medical, retail, and consumer. In industrial applications, the touch controller can be used to power automation tasks, such as controlling machinery and the like. Medical devices can also benefit from this technology, as the controller is capable of accurately monitoring and collecting data from touches along different points on the display. Additionally, the touch controller is also capable of providing tactile feedback to the user.

The ADS7846EG4 also offers great flexibility for retail and consumer applications, including point-of-sale systems, interactive displays, and mobile computing devices, such as tablets and smartphones. With multiple LCD connection options, the controller is designed to reduce the total BOM count and make it easy to accommodate a wide range of designs.

In order to ensure a low power consumption, the ADS7846EG4 features a number of power saving techniques, such as a sleep mode, idle mode, and deep sleep mode. Additionally, the controller can be configured to enter different power saving modes depending on the system\'s needs. This greatly reduces the overall power consumption and increases the battery life of any device that uses the ADS7846EG4.

Conclusion

The ADS7846EG4 touch screen controller is designed to provide direct connectivity to a single- and multi-function touch screen panel with minimal external components. It features a high level of performance and power efficiency, while supporting a variety of configurations and a number of power saving features. The controller is ideally suited for a wide range of touch screen applications, including industrial, medical, retail, and consumer, and is designed to reduce the total BOM count and make it easy to accommodate a wide range of designs.

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