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ADS7845E

Name: ADS7845E
Rating: 4.7 (12 reviews)

ADS7845 5-WIRE TOUCH SCREEN CONT

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規格

Part Status	Active
Touchscreen	5 Wire Resistive
Resolution (Bits)	12 b
Interface	Serial
Voltage Reference	External
Voltage - Supply	2.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	16-SSOP (0.154", 3.90mm Width)
Supplier Device Package	16-SSOP
Current - Supply	280 µA

概述

Description

The ADS7845E is a high-resolution, low-power, 4-wire touchscreen controller designed for interfacing with resistive touchscreens. It features a 12-bit analog-to-digital converter (ADC) for precise touch position measurements and operates within a supply voltage range of 2.7V to 5.5V. The device supports serial communication via SPI, making it suitable for various microcontroller applications.
Key features include fast conversion rates (up to 200 samples per second), programmable gain for enhanced sensitivity, and a built-in power management system to extend battery life in portable devices. The ADS7845E can handle multiple touch inputs, making it capable of distinguishing between different touch events.
Its compact design and integrated features make it ideal for handheld devices, industrial controls, and consumer electronics. The product is characterized by its ease of integration, allowing developers to quickly implement touch functionality in their projects.

Features

The ADS7845E is a precision, low-power, 4-wire resistive touch screen controller with the following key features:
1. Resolution: 12-bit resolution for accurate touch position measurement.
2. Interface: SPI (Serial Peripheral Interface) for easy integration with microcontrollers.
3. Low Power Consumption: Designed for battery-operated devices, offering low power modes.
4. Fast Sampling Rates: Capable of up to 200 samples per second for responsive touch detection.
5. Multiple Channels: Supports multiple touch channels (up to 4) for versatile application in touch screens.
6. Built-in Features: Includes programmable thresholds for noise filtering and touch detection.
7. Wide Supply Voltage Range: Operates from a supply voltage of 2.7V to 5.5V.
8. Temperature Range: Suitable for operation in a wide temperature range (-40°C to +85°C).
9. Compact Package: Available in a small TQFP package, conserving board space.
These features make the ADS7845E ideal for portable devices and applications requiring reliable touch input.

Package

The ADS7845E is available in a 48-pin TQFP (Thin Quad Flat Package) and a 48-pin LQFP (Low-profile Quad Flat Package). These packages are designed for surface mount applications, providing a compact solution for integrating the device into electronic systems.

Pinout

The ADS7845E is a 4-wire touchscreen controller with a total of 16 pins. Here’s a brief overview of its pin functions:
1. VDD: Power supply (typically +2.7V to +5.25V).
2. GND: Ground.
3. SCLK: Serial clock input for SPI communication.
4. DIN: Data input for SPI communication.
5. DOUT: Data output for SPI communication.
6. CS: Chip select, active low for SPI communication.
7. X/Y/Z: Analog input channels for measuring touch coordinates.
8. IRQ: Interrupt request output, indicates a touch event.
9. REF: Reference voltage input.
10. VREF: Voltage reference for ADC operation.
11. SENSE: Used for touch pressure sensing.
12. VCOM: Common voltage output.
13. NC: No connect, not used for internal functions.
14. AVDD: Analog power supply.
15. AVSS: Analog ground.
16. TEST: Test pin, typically not used in normal operation.
These pins facilitate touch detection and communication with microcontrollers or processors via SPI.

Manufacturer

The ADS7845E is manufactured by Texas Instruments (TI), a prominent American technology company. Founded in 1930 and headquartered in Dallas, Texas, TI specializes in designing and manufacturing semiconductors and various integrated circuits. The company is recognized for its innovation in analog and digital signal processing, offering a wide range of products including microcontrollers, processors, and sensors. TI serves a diverse array of industries, including automotive, industrial, communications, and consumer electronics, making it a key player in the global semiconductor market.

Application

The ADS7845E is primarily used in touch screen applications, such as smartphones, tablets, and embedded systems. It enables high-resolution analog-to-digital conversion for touch inputs. Additionally, it can be utilized in industrial automation, medical devices, and consumer electronics for precise position sensing, user interface control, and data acquisition in various applications requiring reliable multi-touch support and fast response times.

Equivalent

Equivalent products to the ADS7845E chip include the ADS7844, ADS7843, and ADS7846 from Texas Instruments. Other alternatives are the MCP3204 from Microchip and the LTC1865 from Analog Devices. These devices offer similar functionalities in terms of resolution, sampling rate, and interface compatibility. Always verify specific features and requirements for compatibility in your application.