ADS7846IRGVT

Product Overview

Category

The ADS7846IRGVT belongs to the category of integrated circuits (ICs).

Use

This IC is primarily used for touch screen applications.

Characteristics

• High precision: The ADS7846IRGVT offers high accuracy in touch screen sensing.
• Low power consumption: It operates with low power requirements, making it suitable for portable devices.
• Wide temperature range: This IC can function reliably across a wide temperature range, enhancing its versatility.
• Fast conversion rate: The ADS7846IRGVT provides fast and efficient analog-to-digital conversion.

Package

The ADS7846IRGVT is available in a small form factor package, specifically the VQFN-16 package.

Essence

The essence of the ADS7846IRGVT lies in its ability to accurately convert analog touch screen signals into digital data.

Packaging/Quantity

This IC is typically packaged in reels, with each reel containing a specific quantity of ADS7846IRGVT units. The exact quantity may vary depending on the manufacturer's specifications.

Specifications

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

Detailed Pin Configuration

The ADS7846IRGVT features a total of 16 pins, each serving a specific purpose. Here is a detailed pin configuration:

1. X+ - Touch Screen X+ input
2. X- - Touch Screen X- input
3. Y+ - Touch Screen Y+ input
4. Y- - Touch Screen Y- input
5. IN3 - Analog input channel 3
6. IN2 - Analog input channel 2
7. IN1 - Analog input channel 1
8. IN0 - Analog input channel 0
9. AGND - Analog ground
10. VCC - Power supply voltage
11. DCLK - Serial clock input
12. DIN - Serial data input
13. DOUT - Serial data output
14. CS - Chip select input
15. BUSY - Busy indicator output
16. PENIRQ - Touch screen interrupt output

Functional Features

The ADS7846IRGVT offers the following functional features:

• Touch screen controller: It provides precise touch screen control capabilities.
• Serial interface: The IC utilizes a serial interface for communication with the microcontroller or host device.
• Interrupt output: The PENIRQ pin generates an interrupt signal to indicate touch screen events.
• Low power mode: The ADS7846IRGVT includes a low power mode to conserve energy when not in use.

Advantages and Disadvantages

Advantages

• High precision touch screen sensing
• Low power consumption
• Wide temperature range operation
• Fast analog-to-digital conversion

Disadvantages

• Limited number of analog input channels
• Requires an external microcontroller or host device for complete functionality

Working Principles

The ADS7846IRGVT operates based on the principle of resistive touch screen technology. When pressure is applied to the touch screen, the X+ and Y+ inputs sense the change in resistance. The IC then converts this analog resistance into digital data using its built-in ADC (Analog-to-Digital Converter). This digital data is then transmitted to the microcontroller or host device for further processing.

Detailed Application Field Plans

The ADS7846IRGVT finds applications in various fields, including but not limited to:

1. Mobile devices: Smartphones, tablets, and portable gaming consoles benefit from the accurate touch screen control provided by this IC.
2. Industrial control systems: The ADS7846IRGVT can be used in industrial touch screen panels for precise input and control.
3. Medical devices: Touch screen interfaces in medical equipment, such as patient monitors or diagnostic devices, can utilize this IC for accurate touch input.

Detailed and Complete Alternative Models

1. ADS7844: Similar to the ADS7846IRGVT, this IC offers 12-bit resolution and is suitable for touch screen applications.
2. ADS7843: This IC provides 10-bit resolution and is commonly used in touch screen devices requiring slightly lower precision.
3. ADS7845: With 8-bit resolution, this IC is suitable for applications where high precision is not critical.

These alternative models offer varying levels of resolution and functionality, allowing designers to choose the most appropriate option based on their specific requirements.

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