ADS7846E/2K5G4

Product Overview

Category

The ADS7846E/2K5G4 belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used for touch screen applications in various electronic devices.

Characteristics

• High precision: The ADS7846E/2K5G4 offers accurate touch screen sensing capabilities.
• Low power consumption: It operates efficiently, minimizing power usage.
• Compact package: The IC is available in a small form factor, making it suitable for space-constrained designs.
• Robust performance: It provides reliable touch screen functionality even in demanding environments.

Package and Quantity

The ADS7846E/2K5G4 is typically packaged in a surface mount package (SMD) such as QFN or TSSOP. The exact package type may vary depending on the manufacturer. It is usually supplied in reels or tubes containing multiple units.

Specifications

• Resolution: The IC supports high-resolution touch screen sensing.
• Communication Interface: It utilizes a serial interface for communication with the microcontroller or host device.
• Operating Voltage: The ADS7846E/2K5G4 operates within a specified voltage range.
• Temperature Range: It can function reliably within a specific temperature range.
• Sampling Rate: The IC has a defined sampling rate for touch screen data acquisition.

Pin Configuration

The ADS7846E/2K5G4 features a specific pin configuration that facilitates its integration into touch screen systems. The following table outlines the pin assignments:

| Pin Number | Pin Name | Description | |------------|----------|-------------| | 1 | VCC | Power supply voltage input | | 2 | GND | Ground reference | | 3 | DOUT | Serial data output | | 4 | DIN | Serial data input | | 5 | DCLK | Serial clock input | | 6 | CS | Chip select input | | 7 | AUX | Auxiliary input/output | | 8 | PENIRQ | Touch screen interrupt output | | 9 | REF+ | Positive reference voltage input | | 10 | REF- | Negative reference voltage input | | 11 | X+ | Touch screen X-axis input | | 12 | X- | Touch screen X-axis input | | 13 | Y+ | Touch screen Y-axis input | | 14 | Y- | Touch screen Y-axis input |

Functional Features

The ADS7846E/2K5G4 offers several functional features that enhance touch screen performance:

1. Touch Screen Sensing: The IC accurately detects touch inputs on the X and Y axes of the touch screen.
2. Communication Interface: It utilizes a serial interface to transmit touch screen data to the microcontroller or host device.
3. Reference Voltage Inputs: The ADS7846E/2K5G4 supports positive and negative reference voltage inputs for precise touch screen sensing.
4. Auxiliary Input/Output: The auxiliary pin can be used for additional functionality, such as temperature sensing or system control.
5. Touch Screen Interrupt: The PENIRQ pin provides an interrupt signal to the microcontroller when a touch event occurs.

Advantages and Disadvantages

Advantages

• High precision touch screen sensing.
• Low power consumption.
• Compact package size.
• Reliable performance in challenging environments.

Disadvantages

• Requires external reference voltage sources.
• Limited availability of alternative models from different manufacturers.

Working Principles

The ADS7846E/2K5G4 operates based on the principle of resistive touch screen sensing. When a user touches the screen, the X and Y coordinates of the touch point are determined by measuring the resistance at specific points on the touch screen. The IC converts these resistance values into digital data, which is then transmitted to the microcontroller or host device for further processing.

Application Field Plans

The ADS7846E/2K5G4 finds extensive application in various electronic devices that incorporate touch screen interfaces. Some common application fields include:

1. Smartphones and Tablets: The IC enables precise touch input detection in mobile devices.
2. Industrial Control Systems: It is used in control panels and human-machine interfaces for accurate touch screen operation.
3. Automotive Infotainment Systems: The ADS7846E/2K5G4 facilitates touch screen functionality in car multimedia systems.
4. Medical Devices: It is employed in medical equipment with touch screen interfaces, ensuring accurate user interaction.

Alternative Models

While the ADS7846E/2K5G4 is a widely used touch screen controller, there are alternative models available from different manufacturers. Some popular alternatives include:

• STMPE811: A touch screen controller from STMicroelectronics.
• TSC2046: An alternative