PCF8575CDWR

Product Overview

• Category: Integrated Circuit (IC)
• Use: I/O Expander
• Characteristics: 16-bit remote I/O expander for I2C-bus with interrupt
• Package: SOIC (Small Outline Integrated Circuit) package
• Essence: The PCF8575CDWR is a versatile I/O expander that allows users to increase the number of input/output pins on a microcontroller or other devices using the I2C-bus protocol.
• Packaging/Quantity: Tape and reel, 2500 units per reel

Specifications

• Supply Voltage Range: 2.3V to 5.5V
• I2C-bus Interface: Compatible with I2C-bus Fast-mode and Standard-mode
• Number of I/O Pins: 16
• Interrupt Output: Active LOW open-drain interrupt output
• Input/Output Current: ±10mA
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The PCF8575CDWR has a total of 24 pins. The pin configuration is as follows:

1. A0: Address input bit 0
2. A1: Address input bit 1
3. A2: Address input bit 2
4. GND: Ground
5. P0-P7: I/O Port 0-7
6. INT: Interrupt output
7. SDA: Serial data input/output
8. SCL: Serial clock input

Functional Features

• Remote I/O Expansion: The PCF8575CDWR provides 16 additional I/O pins that can be controlled through the I2C-bus interface.
• Interrupt Functionality: The device features an interrupt output that can be used to notify the microcontroller when any of the I/O pins change state.
• Low Power Consumption: The PCF8575CDWR is designed to operate with low power consumption, making it suitable for battery-powered applications.
• Wide Operating Voltage Range: The device can be powered from 2.3V to 5.5V, allowing compatibility with a wide range of systems.

Advantages and Disadvantages

Advantages: - Easy I/O Expansion: The PCF8575CDWR simplifies the process of expanding the number of I/O pins on a microcontroller without the need for complex wiring. - Interrupt Capability: The interrupt functionality allows for efficient handling of I/O events, reducing the need for continuous polling. - Low Power Consumption: The device's low power consumption makes it suitable for energy-efficient applications.

Disadvantages: - Limited I/O Voltage Range: The PCF8575CDWR operates at the same voltage level as the VCC supply, which may limit its compatibility with devices that require different voltage levels. - I2C-bus Dependency: The device relies on the I2C-bus protocol for communication, which may introduce additional complexity in system design.

Working Principles

The PCF8575CDWR works by utilizing the I2C-bus protocol to communicate with the microcontroller or host device. It acts as an I/O expander by providing 16 additional bidirectional I/O pins. The device can be addressed using three address input pins (A0, A1, A2), allowing up to eight devices to be connected on the same bus.

When an I/O pin changes state, the PCF8575CDWR generates an interrupt signal on the INT pin, which can be used to trigger an interrupt routine in the microcontroller. This allows for efficient event-driven programming and reduces the need for continuous polling of the I/O pins.

Detailed Application Field Plans

The PCF8575CDWR finds applications in various fields, including:

1. Industrial Automation: The device can be used to expand the number of I/O pins in industrial control systems, allowing for efficient monitoring and control of sensors, actuators, and other devices.
2. Home Automation: It can be utilized in home automation systems to increase the number of available I/O pins for controlling lights, appliances, and security systems.
3. Robotics: The PCF8575CDWR can be integrated into robotic systems to provide additional I/O capabilities for controlling motors, sensors, and communication interfaces.
4. IoT (Internet of Things): The device is suitable for IoT applications where multiple sensors and actuators need to be connected to a microcontroller with limited I/O pins.

Detailed and Complete Alternative Models

1. MCP23017: 16-bit I/O expander with I2C-bus interface and interrupt functionality.
2. MAX7313: 16-bit I/O expander with serial interface and interrupt output.
3. PCA9555: 16-bit I/O expander with I2C-bus interface and interrupt capability.

These alternative models offer similar functionality and can be considered as alternatives to the PCF857