PCA9555PW,118

The PCA9555PW,118 is an I2C-bus controlled 16-bit I/O expander optimized for a wide range of applications. This IC provides GPIO expansion with interrupt output for various microcontroller systems, enabling flexible I/O configuration and control.

Pinout

(Note: The pin configuration below is a general representation. Refer to the specific datasheet for precise details.)

• GND: Ground connection
• VCC: Positive power supply
• SCL: I2C-bus clock signal input
• SDA: I2C-bus data signal input/output
• P00-P07: I/O ports 0-7
• P10-P17: I/O ports 8-15
• INT: Interrupt output

Circuit Diagram

Include a circuit diagram illustrating the connections and operation of the PCA9555PW,118 IC for a visual representation.

Key Features

• 16-Bit I/O Expander: Provides 16 I/O ports for flexible GPIO expansion.
• I2C-Bus Controlled: Allows easy interfacing with microcontrollers via the I2C communication protocol.
• Interrupt Output: Features an interrupt pin for notifying the microcontroller of input changes.
• Wide Operating Voltage Range: Supports operation from 2.3V to 5.5V, making it versatile for various systems.
• High-Speed I2C Interface: Supports I2C clock frequencies up to 400 kHz for efficient data transfer.

Note: For detailed technical specifications, please refer to the PCA9555PW,118 datasheet.

Application

• Microcontroller I/O Expansion: Ideal for expanding the I/O capabilities of microcontrollers with limited GPIO pins.
• Sensor Interfaces: Suitable for interfacing with sensors and input devices in embedded systems.
• LED Control: Can be used to control multiple LEDs individually through the I2C interface.

Functionality

The PCA9555PW,118 serves as a convenient I/O expansion solution for microcontroller-based systems. It provides a seamless interface for managing additional I/O ports and supports interrupt-driven input changes.

Usage Guide

• Power Supply: Connect VCC (Pin 8) to the supply voltage (2.3V to 5.5V).
• I2C Interface: Connect SCL (Pin 7) and SDA (Pin 6) to the microcontroller's I2C bus.
• I/O Configuration: Configure the I/O pins for input or output mode based on system requirements.

Frequently Asked Questions

Q: Can the PCA9555PW,118 be used with 3.3V microcontrollers?
A: Yes, the PCA9555PW,118 supports operation from 2.3V to 5.5V, making it compatible with 3.3V microcontrollers.

Q: How many devices can be connected in parallel on the I2C bus?
A: The number of devices on the I2C bus is limited by the device addressing scheme, allowing multiple PCA9555PW,118 devices to be connected in parallel.