ADS7845E

Product Overview

• Category: Integrated Circuit (IC)
• Use: Touch Screen Controller
• Characteristics:
  • High-resolution touch screen control
  • Low power consumption
  • Serial interface
  • Accurate touch position detection
• Package: 16-pin Small Outline Package (SOP)
• Essence: The ADS7845E is a touch screen controller IC that enables accurate touch position detection for high-resolution touch screens.
• Packaging/Quantity: Available in reels of 2500 units.

Specifications

• Resolution: 12-bit
• Interface: Serial Peripheral Interface (SPI)
• Operating Voltage: 2.7V to 5.25V
• Operating Temperature: -40°C to +85°C
• Conversion Time: 8μs per channel
• Touch Pressure: Up to 10g

Pin Configuration

The ADS7845E has a 16-pin Small Outline Package (SOP) with the following pin configuration:

1. VCC - Power supply voltage
2. GND - Ground
3. DOUT - Data output
4. DIN - Data input
5. CS - Chip select
6. BUSY - Busy indicator
7. PD - Power-down mode
8. REF+ - Positive reference voltage
9. REF- - Negative reference voltage
10. X+ - X-axis positive input
11. X- - X-axis negative input
12. Y+ - Y-axis positive input
13. Y- - Y-axis negative input
14. AUX - Auxiliary input
15. AGND - Analog ground
16. VREF - Reference voltage

Functional Features

• Accurate touch position detection
• Supports both single-touch and multi-touch gestures
• Low power consumption for extended battery life
• Serial interface for easy integration with microcontrollers
• High-resolution output for precise touch control

Advantages and Disadvantages

Advantages: - Accurate touch position detection - Low power consumption - Easy integration with microcontrollers - High-resolution output

Disadvantages: - Limited to touch screen applications - Requires external reference voltage

Working Principles

The ADS7845E operates by converting the analog signals from the touch screen into digital data. It uses a 12-bit resolution ADC (Analog-to-Digital Converter) to accurately measure the touch position. The controller communicates with a microcontroller through the SPI interface, enabling seamless integration into various systems.

Detailed Application Field Plans

The ADS7845E is widely used in various touch screen applications, including: - Smartphones and tablets - Industrial control panels - Point-of-sale terminals - Gaming devices - Medical equipment

Alternative Models

For those seeking alternative touch screen controller ICs, the following models can be considered: 1. ADS7846 - Similar features and specifications as ADS7845E, but with additional features for multi-touch support. 2. TSC2046 - Offers similar functionality with lower power consumption. 3. STMPE811 - Provides advanced touch screen control features with enhanced accuracy.

These alternative models offer different trade-offs in terms of features, power consumption, and cost, allowing users to choose the most suitable option for their specific application requirements.

In conclusion, the ADS7845E is a highly capable touch screen controller IC that offers accurate touch position detection and low power consumption. Its serial interface and high-resolution output make it an ideal choice for various touch screen applications.