PCF8574DWRE4

Overview

• Category: Integrated Circuit (IC)
• Use: I/O Expander
• Characteristics: 8-bit remote I/O expander for I2C-bus with interrupt
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: The PCF8574DWRE4 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: 2.5V to 6V
• Input/Output Voltage: 0V to VCC
• Input/Output Current: 25mA
• Operating Temperature Range: -40°C to +85°C
• I2C-bus Frequency: Up to 400kHz

Detailed Pin Configuration

The PCF8574DWRE4 has a total of 16 pins, which are assigned as follows:

1. A0: Address Input Bit 0
2. A1: Address Input Bit 1
3. A2: Address Input Bit 2
4. P0: General Purpose I/O Pin 0
5. P1: General Purpose I/O Pin 1
6. P2: General Purpose I/O Pin 2
7. P3: General Purpose I/O Pin 3
8. P4: General Purpose I/O Pin 4
9. P5: General Purpose I/O Pin 5
10. P6: General Purpose I/O Pin 6
11. P7: General Purpose I/O Pin 7
12. INT: Interrupt Output
13. SDA: Serial Data Line
14. SCL: Serial Clock Line
15. GND: Ground
16. VCC: Supply Voltage

Functional Features

• 8-bit bidirectional I/O port
• I2C-bus interface compatible with standard-mode and fast-mode (up to 400kHz)
• Interrupt output for efficient communication with the microcontroller
• Low standby current consumption
• Noise filter on SDA/SCL inputs for improved noise immunity

Advantages and Disadvantages

Advantages: - Allows expansion of I/O pins without using additional microcontroller pins - Easy integration with devices supporting the I2C-bus protocol - Interrupt feature enhances efficiency in data transfer - Low power consumption in standby mode

Disadvantages: - Limited number of I/O pins (8 in total) - Requires understanding and implementation of the I2C-bus protocol

Working Principles

The PCF8574DWRE4 operates as an I/O expander by communicating with a microcontroller or other devices through the I2C-bus protocol. It acts as a bridge between the microcontroller and external devices, providing additional input/output capabilities. The device can be addressed using three address input bits (A0, A1, A2), allowing up to eight PCF8574DWRE4 devices to be connected on the same I2C-bus.

Detailed Application Field Plans

The PCF8574DWRE4 finds applications in various fields, including:

1. Home Automation: Controlling multiple sensors and actuators in smart home systems.
2. Industrial Automation: Expanding the number of I/O pins in industrial control systems.
3. Robotics: Enabling communication with multiple peripheral devices in robotic systems.
4. Automotive Electronics: Integrating additional I/O functionality in automotive applications.
5. IoT Devices: Enhancing the connectivity and functionality of Internet of Things devices.

Alternative Models

1. MCP23008: 8-bit I/O expander with I2C interface.
2. MCP23S08: 8-bit I/O expander with SPI interface.
3. MAX7311: 16-bit I/O expander with I2C interface.
4. PCA9555: 16-bit I/O expander with I2C interface.

These alternative models offer similar functionality and can be used as substitutes for the PCF8574DWRE4 depending on specific requirements.

In conclusion, the PCF8574DWRE4 is a versatile I/O expander that provides additional input/output capabilities using the I2C-bus protocol. Its compact package, low power consumption, and interrupt feature make it suitable for various applications in different fields.