PCF8579H/1:118

Product Overview

• Category: Integrated Circuit (IC)
• Use: I/O Expander
• Characteristics: High-speed, 16-bit I/O expander with interrupt output
• Package: SO20 (Small Outline 20-pin package)
• Essence: The PCF8579H/1:118 is a versatile I/O expander IC that provides additional input/output ports for microcontrollers or other digital devices.
• Packaging/Quantity: Available in reels of 2500 units

Specifications

• Supply Voltage: 2.5V to 6V
• Input/Output Voltage Range: 0V to VDD
• Maximum Output Current: 25mA per channel
• Operating Temperature Range: -40°C to +85°C
• Interrupt Output: Open-drain active-low interrupt output

Detailed Pin Configuration

The PCF8579H/1:118 has a total of 20 pins. Here is the detailed pin configuration:

1. SDA: Serial Data Input/Output
2. SCL: Serial Clock Input
3. A0: Address Bit 0
4. A1: Address Bit 1
5. A2: Address Bit 2
6. RESET: Reset Input
7. INT: Interrupt Output
8. GND: Ground 9-16. P0-P7: Bidirectional I/O Ports 17-20. NC: No Connection

Functional Features

• High-speed I/O expansion: The PCF8579H/1:118 allows for easy expansion of I/O ports, providing flexibility in connecting multiple devices.
• Interrupt capability: The interrupt output can be used to notify the microcontroller when an input changes, reducing the need for continuous polling.
• Low power consumption: The IC operates at low power levels, making it suitable for battery-powered applications.
• Wide voltage range: The PCF8579H/1:118 can be powered by a wide range of supply voltages, enhancing its compatibility with different systems.

Advantages and Disadvantages

Advantages: - Easy integration with microcontrollers - Simplifies I/O expansion - Interrupt capability reduces processor load - Low power consumption

Disadvantages: - Limited number of I/O ports (16-bit) - Requires additional components for proper operation

Working Principles

The PCF8579H/1:118 is based on the I2C bus protocol. It communicates with the microcontroller using the SDA (Serial Data) and SCL (Serial Clock) lines. The microcontroller sends commands and data to the IC, which in turn controls the I/O ports accordingly. The interrupt output can be configured to trigger when a specific input changes, allowing the microcontroller to respond promptly.

Detailed Application Field Plans

The PCF8579H/1:118 finds applications in various fields, including but not limited to:

1. Industrial automation: Used for expanding I/O capabilities in control systems.
2. Automotive electronics: Enables additional inputs/outputs for vehicle control modules.
3. Home automation: Facilitates the connection of multiple sensors and actuators.
4. Consumer electronics: Provides extra I/O ports for devices like smart TVs and gaming consoles.
5. Internet of Things (IoT): Integrates with IoT devices to enhance connectivity options.

Detailed and Complete Alternative Models

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

These alternative models offer similar functionality and can be considered as alternatives to the PCF8579H/1:118.

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