PCF8574NG4

Product Overview

• Category: Integrated Circuit
• Use: I/O Expander
• Characteristics: Low-power, 8-bit remote I/O expander for I2C-bus with interrupt
• Package: DIP (Dual In-line Package)
• Essence: PCF8574NG4 is a versatile integrated circuit that expands the input/output capabilities of microcontrollers or other devices.
• Packaging/Quantity: Available in tubes or reels, quantity varies based on manufacturer.

Specifications

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

Detailed Pin Configuration

The PCF8574NG4 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. GND: Ground
14. VCC: Supply Voltage
15. SDA: Serial Data Line (I2C-bus)
16. SCL: Serial Clock Line (I2C-bus)

Functional Features

• Expandable I/O: PCF8574NG4 provides 8 additional I/O ports, allowing the connection of multiple devices to a microcontroller using only two wires.
• Interrupt Capability: The interrupt output pin (INT) can be used to notify the microcontroller when an input changes state.
• Low Power Consumption: The IC operates at low power, making it suitable for battery-powered applications.
• I2C-bus Compatibility: It supports various I2C-bus modes, enabling easy integration with different microcontrollers and devices.

Advantages and Disadvantages

Advantages: - Simplifies circuit design by reducing the number of required I/O pins on the microcontroller. - Allows for easy expansion of I/O capabilities without consuming additional microcontroller resources. - Supports interrupt functionality for efficient event-driven programming.

Disadvantages: - Limited to 8-bit I/O expansion, may not be sufficient for complex projects requiring more I/O ports. - Requires understanding and implementation of the I2C-bus protocol.

Working Principles

The PCF8574NG4 is controlled through the I2C-bus interface. It communicates with the microcontroller or host device using serial data (SDA) and clock (SCL) lines. The microcontroller sends commands and data to the PCF8574NG4, which in turn controls the state of its I/O ports. The interrupt output (INT) can be configured to trigger an interrupt on the microcontroller when any of the input states change.

Detailed Application Field Plans

1. Home Automation: PCF8574NG4 can be used to expand the I/O capabilities of a home automation system, allowing control of various devices such as lights, sensors, and actuators.
2. Industrial Control: It can be employed in industrial control systems to interface with sensors, switches, and other peripheral devices.
3. Robotics: PCF8574NG4 enables the connection of multiple sensors and actuators to a microcontroller, facilitating the development of robotic systems.
4. IoT Devices: The IC can be utilized in Internet of Things (IoT) devices to expand their input/output capabilities, enabling communication with various sensors and actuators.

Detailed and Complete Alternative Models

1. PCF8574: Similar to PCF8574NG4, but without the interrupt output feature.
2. MCP23017: Another I/O expander IC with 16-bit I/O capability and I2C-bus interface.
3. MAX7313: Provides 16 I/O ports with LED driver functionality, suitable for applications requiring control of LEDs.

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