ADS7846N/2K5

Product Overview

Category

The ADS7846N/2K5 belongs to the category of integrated circuits (ICs).

Use

This product is commonly used in touch screen applications, specifically for resistive touch screens.

Characteristics

• The ADS7846N/2K5 is a 12-bit analog-to-digital converter (ADC) with a built-in touch screen controller.
• It supports both single-touch and multi-touch functionality.
• This IC offers high precision and accuracy in converting analog signals from the touch screen into digital data.
• It operates on a low power supply voltage, making it suitable for portable devices.
• The ADS7846N/2K5 has a fast conversion rate, enabling real-time touch response.

Package

The ADS7846N/2K5 is available in a small outline package (SOP) or a thin shrink small outline package (TSSOP).

Essence

The essence of the ADS7846N/2K5 lies in its ability to accurately convert touch screen inputs into digital data, facilitating user interaction with electronic devices.

Packaging/Quantity

This product is typically packaged in reels or tubes, with a quantity of 2500 units per package.

Specifications

• Resolution: 12-bit
• Input Voltage Range: 0V to VCC
• Conversion Time: 50µs per channel
• Operating Temperature Range: -40°C to +85°C
• Supply Voltage: 2.7V to 5.25V
• Interface: SPI (Serial Peripheral Interface)

Detailed Pin Configuration

The ADS7846N/2K5 has the following pin configuration:

1. VCC: Power supply voltage
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. BUSY: Conversion status output
8. PENIRQ: Touch screen interrupt request

Functional Features

• Touch Screen Controller: The ADS7846N/2K5 integrates a touch screen controller, eliminating the need for an external controller.
• Multi-Touch Support: This IC can handle multiple touch points simultaneously, enabling advanced touch gestures.
• Low Power Consumption: The ADS7846N/2K5 operates on a low power supply voltage, conserving energy in portable devices.
• High Accuracy: With its 12-bit resolution, this IC provides precise and accurate touch screen data conversion.
• Fast Conversion Rate: The ADS7846N/2K5 offers a fast conversion time of 50µs per channel, ensuring real-time touch response.

Advantages and Disadvantages

Advantages

• Integrated touch screen controller reduces external component count.
• Supports multi-touch functionality for enhanced user experience.
• Low power consumption extends battery life in portable devices.
• High accuracy ensures accurate touch input recognition.
• Fast conversion rate enables real-time touch response.

Disadvantages

• Limited to resistive touch screens, not compatible with capacitive touch screens.
• Requires additional external components for complete touch screen implementation.
• May require calibration for optimal performance.

Working Principles

The ADS7846N/2K5 works by sampling the analog voltages generated by a resistive touch screen. It converts these analog signals into digital data using its built-in ADC. The touch screen controller within the IC processes the digital data and communicates it to the host device through the SPI interface. The host device interprets the data to determine touch positions and perform appropriate actions.

Detailed Application Field Plans

The ADS7846N/2K5 is widely used in various applications, including: 1. Mobile phones and tablets: Enables touch input for user interaction. 2. Industrial control panels: Facilitates touch-based control and monitoring. 3. Automotive infotainment systems: Allows intuitive touch screen operation. 4. Portable gaming devices: Enhances user experience with touch-based controls. 5. Medical equipment: Enables touch input for user interface navigation.

Detailed and Complete Alternative Models

1. ADS7846E: Similar to the ADS7846N/2K5, but operates at a lower temperature range (-40°C to +70°C).
2. ADS7846M: Offers additional features such as on-chip temperature sensor and programmable interrupt controller.
3. ADS7846R: Designed specifically for automotive applications, with extended temperature range and enhanced ESD protection.

These alternative models provide similar functionality to the ADS7846N/2K5, catering to different temperature requirements and offering additional features based on specific application needs.

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