Overview
The Texas Instruments ADS7846E/2K5 is a next-generation touch screen controller, designed to be 100% pin-compatible with the industry standard ADS7843. This controller is part of the resistive touch screen category and features a 4-wire interface. It operates within a wide supply voltage range of 2.2V to 5.25V, making it versatile for various applications. The ADS7846E/2K5 is fabricated on a 0.6µm CMOS process and includes an internal 2.5V reference voltage, which can be overdriven by an external low impedance source if needed.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Manufacturer | Texas Instruments | |
| Part Number | ADS7846E/2K5 | |
| Package | SSOP-16-150mil | |
| Interface | SPI | |
| Supply Voltage | 2.2V to 5.25V | |
| Operating Temperature | -40°C to +85°C | |
| Resolution | 12-bit | |
| Quiescent Current | 280 µA to 650 µA (Internal Reference OFF), 780 µA (Internal Reference ON) | |
| Power Dissipation | 1.8 mW at +VCC = +2.7V | |
| ROHS Status | ROHS Compliant |
Key Features
- 4-Wire Resistive Touch Screen Interface: Supports standard 4-wire resistive touch screens.
- Internal Reference Voltage: Includes an internal 2.5V reference voltage that can be overdriven by an external source.
- Wide Supply Voltage Range: Operates from 2.2V to 5.25V, making it suitable for a variety of applications.
- Low Power Consumption: Features low quiescent current and power dissipation, ideal for battery-powered devices.
- Temperature Measurement: Capable of measuring temperature without the need for absolute temperature calibration.
- Pin Compatibility: 100% pin-compatible with the ADS7843, simplifying upgrades and design changes.
Applications
- Touch Screen Displays: Ideal for resistive touch screen applications in various devices such as smartphones, tablets, and industrial control panels.
- Portable Electronics: Suitable for battery-powered devices due to its low power consumption.
- Industrial Automation: Used in touch screen interfaces for industrial control systems and human-machine interfaces (HMIs).
- Medical Devices: Can be used in medical devices that require touch screen interfaces, such as patient monitoring systems and medical tablets.
Q & A
- What is the operating supply voltage range of the ADS7846E/2K5?
The ADS7846E/2K5 operates within a supply voltage range of 2.2V to 5.25V.
- What is the resolution of the ADS7846E/2K5 touch screen controller?
The resolution of the ADS7846E/2K5 is 12-bit.
- Is the ADS7846E/2K5 ROHS compliant?
Yes, the ADS7846E/2K5 is ROHS compliant.
- What is the operating temperature range of the ADS7846E/2K5?
The operating temperature range is -40°C to +85°C.
- Does the ADS7846E/2K5 have an internal reference voltage?
Yes, it includes an internal 2.5V reference voltage that can be overdriven by an external source.
- What type of interface does the ADS7846E/2K5 use?
The ADS7846E/2K5 uses an SPI (Serial Peripheral Interface) for communication.
- Is the ADS7846E/2K5 pin-compatible with other models?
Yes, it is 100% pin-compatible with the ADS7843.
- What is the power dissipation of the ADS7846E/2K5 at 2.7V supply voltage?
The power dissipation is 1.8 mW at +VCC = +2.7V.
- Can the ADS7846E/2K5 measure temperature?
Yes, it can measure temperature without the need for absolute temperature calibration.
- What is the typical quiescent current of the ADS7846E/2K5?
The quiescent current ranges from 280 µA to 650 µA (Internal Reference OFF) and 780 µA (Internal Reference ON).
