PCF8574APWG4

Overview

• Category: Integrated Circuit (IC)
• Use: I/O Expander
• Characteristics: 8-bit remote I/O expander for I2C-bus with interrupt
• Package: TSSOP-16
• Essence: The PCF8574APWG4 is a versatile IC that allows for easy expansion of input/output (I/O) capabilities in various applications.
• Packaging/Quantity: Available in reels of 2500 units

Specifications

• Supply Voltage Range: 2.5V to 6V
• Input/Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• I2C-bus Interface: Compatible with I2C-bus Fast-mode, Standard-mode, and SMBus protocols
• Interrupt Output: Active LOW open-drain output
• Maximum Sink Current: 25mA per I/O pin
• Standby Current Consumption: 10µA

Pin Configuration

The PCF8574APWG4 has a total of 16 pins arranged as follows:

___________ | | 1 | 16 | VCC 2 | 15 | SDA 3 | 14 | SCL 4 | 13 | INT 5 | 12 | P7 6 | 11 | P6 7 | 10 | P5 8 | 9 | GND |___________|

Functional Features

• Bidirectional I/O Expansion: Provides 8 additional I/O pins that can be used as inputs or outputs.
• I2C-bus Interface: Allows easy communication with microcontrollers and other devices supporting the I2C protocol.
• Interrupt Output: Generates an interrupt signal to the microcontroller when any of the I/O pins change state.
• Low Standby Current: Consumes minimal power in standby mode, making it suitable for low-power applications.

Advantages and Disadvantages

Advantages: - Easy I/O Expansion: Simplifies the process of adding more I/O pins to a microcontroller or system. - Versatility: Can be used in various applications that require additional I/O capabilities. - Low Power Consumption: Operates efficiently in low-power scenarios.

Disadvantages: - Limited Number of I/O Pins: The PCF8574APWG4 provides only 8 additional I/O pins, which may not be sufficient for certain complex systems. - Requires I2C-bus Support: The host microcontroller or device must support the I2C-bus protocol for communication.

Working Principles

The PCF8574APWG4 is designed to expand the I/O capabilities of a microcontroller or system using the I2C-bus interface. It acts as a bridge between the host device and external peripherals by providing 8 additional bidirectional I/O pins. These pins can be configured as inputs or outputs based on the application requirements.

The I2C-bus interface allows for easy communication between the PCF8574APWG4 and the host device. The host device sends commands and data to the IC, which then controls the state of the I/O pins accordingly. The interrupt output pin (INT) can be used to notify the host device when any of the I/O pins change state, enabling efficient event-driven programming.

Detailed Application Field Plans

The PCF8574APWG4 finds applications in various fields, including but not limited to:

1. Home Automation: Used to control and monitor devices such as lights, sensors, and actuators.
2. Industrial Automation: Enables expansion of I/O capabilities in industrial control systems.
3. Robotics: Provides additional I/O pins for controlling motors, sensors, and other peripherals.
4. IoT (Internet of Things): Facilitates connectivity and control of devices in IoT applications.
5. Automotive Electronics: Used for I/O expansion in automotive control units and infotainment systems.

Detailed and Complete Alternative Models

1. PCF8574A: Similar to PCF8574APWG4 but available in a DIP package.
2. MCP23017: I/O expander with 16 I/O pins and I2C-bus interface.
3. MAX7313: 16-bit I/O expander with interrupt output and serial interface.
4. PCA9538: 8-bit I/O expander with interrupt and reset functions.

These alternative models offer similar functionality and can be considered based on specific requirements and availability.

In conclusion, the PCF8574APWG4 is a versatile I/O expander IC that provides easy expansion of I/O capabilities in various applications. Its compact package, low power