PCF8574PWR

Product Overview

• Category: Integrated Circuit (IC)
• Use: I/O Expander
• Characteristics: 8-bit remote I/O expander for I2C-bus with interrupt
• Package: TSSOP (Thin Shrink Small Outline Package)
• Essence: The PCF8574PWR is a versatile IC that allows for easy expansion of input/output (I/O) capabilities of microcontrollers or other devices using the I2C-bus protocol.
• Packaging/Quantity: Available in reels of 2500 pieces

Specifications

• Supply Voltage: 2.5V to 6V
• Input/Output Voltage: 0V to VDD
• Maximum Output Current: 25mA per channel
• I2C-bus Interface: Compatible with standard-mode, fast-mode, and high-speed mode
• Interrupt Output: Active-low open-drain output
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The PCF8574PWR 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: I/O Port 0
5. P1: I/O Port 1
6. P2: I/O Port 2
7. P3: I/O Port 3
8. P4: I/O Port 4
9. P5: I/O Port 5
10. P6: I/O Port 6
11. P7: I/O Port 7
12. INT: Interrupt Output
13. SDA: Serial Data Line (I2C-bus)
14. SCL: Serial Clock Line (I2C-bus)
15. GND: Ground
16. VDD: Supply Voltage

Functional Features

• Bidirectional I/O Ports: Each of the 8 ports can be individually configured as input or output.
• Interrupt Functionality: The PCF8574PWR can generate an interrupt signal to the microcontroller when any of the input pins change state.
• I2C-bus Compatibility: It supports the widely used I2C-bus protocol, allowing for easy integration with various microcontrollers and devices.
• Low Power Consumption: The IC is designed to operate with low power consumption, making it suitable for battery-powered applications.

Advantages and Disadvantages

Advantages: - Easy I/O Expansion: The PCF8574PWR simplifies the process of expanding the I/O capabilities of microcontrollers without using multiple pins. - Versatility: It can be used in a wide range of applications that require additional I/O ports. - Interrupt Capability: The interrupt feature allows for efficient handling of input changes, reducing the need for continuous polling.

Disadvantages: - Limited Output Current: The maximum output current per channel is limited to 25mA, which may not be sufficient for certain high-power applications. - Addressing Limitation: The PCF8574PWR has a limited number of address combinations (up to 8 devices on the same I2C-bus), which may restrict its use in complex systems requiring more I/O expansion.

Working Principles

The PCF8574PWR operates by communicating with a microcontroller or other devices through the I2C-bus protocol. It acts as an I/O expander, allowing the microcontroller to control or read the status of up to 8 external devices connected to its I/O ports. The interrupt functionality enables the microcontroller to be notified immediately when any of the input pins change state, improving efficiency and responsiveness.

Detailed Application Field Plans

The PCF8574PWR finds applications in various fields, including but not limited to:

1. Home Automation: It can be used to control and monitor multiple sensors, switches, and actuators in a smart home system.
2. Industrial Automation: The IC enables expansion of I/O capabilities in industrial control systems, facilitating the connection of numerous devices.
3. Robotics: It can be utilized to interface with sensors, motors, and other peripherals in robotic systems.
4. IoT (Internet of Things): The PCF8574PWR is suitable for IoT applications where additional I/O ports are required for sensor integration and data acquisition.
5. Automotive Electronics: It can be employed in automotive systems for controlling lights, sensors, and other peripheral devices.

Detailed and Complete Alternative Models

1. MCP23017: Similar to PCF8574PWR, it offers 16-bit I/O expander functionality with interrupt support.
2. MAX7313: Provides 16-bit I/O expansion with higher output current capability and additional features like LED driver control.
3. PCA9555: Offers 16-bit I/O expansion