PCF8575CDWE4

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 PCF8575CDWE4 is a versatile IC that expands the number of input/output (I/O) pins available in a microcontroller or microprocessor-based system.
• Packaging/Quantity: Available in tape and reel packaging, with 2500 units per reel.

Specifications

• Number of I/O Pins: 16
• Supply Voltage Range: 2.3V to 6V
• I2C-bus Interface Compatibility: Standard-mode, Fast-mode, Fast-mode Plus
• Interrupt Output Pin: Yes
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The PCF8575CDWE4 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. P0-P7: I/O Port 0-7
5. INT: Interrupt Output
6. SDA: Serial Data Line
7. SCL: Serial Clock Line
8. VSS: Ground
9. P15-P8: I/O Port 15-8
10. VDD: Supply Voltage

Functional Features

• Remote I/O Expansion: The PCF8575CDWE4 allows for expanding the number of I/O pins available in a system, providing flexibility in connecting various peripherals.
• I2C-bus Interface: It utilizes the I2C-bus protocol for communication, enabling easy integration with microcontrollers and microprocessors.
• Interrupt Functionality: The IC has an interrupt output pin that can be used to notify the host system of any changes in the input status, reducing the need for continuous polling.
• Low Power Consumption: The PCF8575CDWE4 is designed to operate with low power consumption, making it suitable for battery-powered applications.

Advantages and Disadvantages

Advantages: - Increased I/O Flexibility: Allows for easy expansion of I/O pins in a system without the need for additional microcontroller pins. - Simplified Communication: Utilizes the widely adopted I2C-bus protocol for communication, ensuring compatibility with various devices. - Interrupt Capability: Provides an interrupt output pin, reducing the need for constant polling and improving system efficiency.

Disadvantages: - Limited Number of I/O Pins: The PCF8575CDWE4 offers 16 additional I/O pins, which may not be sufficient for applications requiring a large number of peripherals. - Dependency on I2C-bus: The IC relies on the I2C-bus interface for communication, which may limit its use in systems that do not support this protocol.

Working Principles

The PCF8575CDWE4 operates as an I/O expander by connecting to a microcontroller or microprocessor through the I2C-bus interface. It uses the address inputs (A0, A1, A2) to set its unique address on the bus, allowing multiple PCF8575CDWE4 devices to coexist on the same bus. The I/O ports (P0-P7, P8-P15) can be configured as either inputs or outputs, providing flexibility in connecting various peripherals. The interrupt output pin (INT) can be used to signal the host system when there are changes in the input status, reducing the need for continuous polling.

Detailed Application Field Plans

The PCF8575CDWE4 finds applications in various fields, including: 1. Industrial Automation: Used for expanding the number of I/O pins in control systems, allowing for easy integration of sensors, actuators, and other peripherals. 2. Home Automation: Enables the connection of multiple devices, such as switches, sensors, and displays, to a central control unit. 3. Automotive Electronics: Provides additional I/O pins for connecting various components in automotive systems, such as lighting controls, climate control modules, and dashboard displays. 4. Internet of Things (IoT): Facilitates the expansion of I/O capabilities in IoT devices, enabling seamless integration with sensors, actuators, and communication modules.

Alternative Models

• PCF8574: 8-bit remote I/O expander for I2C-bus without interrupt functionality.
• MCP23017: 16-bit I/O expander with I2C-bus/SPI interface and interrupt capability.
• MAX7313: 16-bit I/O expander with serial interface and interrupt output.

Note: The above alternative models are provided as examples and may have different specifications and features. It is recommended to refer to their