ON Semiconductor PCA9655EDWR2G Overview

The PCA9655EDWR2G is a robust I/O expander from ON Semiconductor, designed to provide additional I/O capabilities to microcontroller-based systems. This product is particularly useful for applications where the number of I/O pins on the microcontroller is insufficient. It utilizes the I²C bus to facilitate communication between the microcontroller and the expander, thus minimizing the need for extensive wiring and simplifying the design process.

Key Features

• I²C Interface: The device supports a fast I²C-bus interface with speeds up to 400 kHz, allowing for quick and efficient data transfer between the expander and the host controller.
• 16-bit I/O Ports: It expands the I/O capabilities by providing 16 additional I/O ports that can be configured either as inputs or outputs, offering great flexibility for a wide range of applications.
• High Drive Capability: The outputs can sink or source up to 25 mA, making it suitable for driving LEDs or other high-current loads directly.
• Interrupt Output: An interrupt output pin is available to notify the host microcontroller of changes on the input pins, allowing for efficient use of resources by only polling the I/O expander when necessary.
• Power Supply: The PCA9655EDWR2G operates over a wide voltage range from 2.3V to 5.5V, making it compatible with most microcontroller logic levels and suitable for battery-operated devices.
• Packaging: It is offered in a compact, surface-mount SOIC-24 wide body package, ideal for space-constrained applications.

Applications

The PCA9655EDWR2G is an excellent choice for expanding I/O ports in a variety of applications, including:

• Industrial control systems
• Servers and networking equipment
• Gaming consoles
• Home automation systems
• Medical equipment

With its ease of use, flexibility, and ON Semiconductor's reputation for reliability, the PCA9655EDWR2G is a go-to solution for designers looking to enhance their system's I/O capabilities without a significant increase in footprint or complexity.