PCF8574ANG4

Product Overview

• Category: Integrated Circuit (IC)
• Use: I/O Expander
• Characteristics: 8-bit remote I/O expander for I2C-bus with interrupt
• Package: SO16 (Small Outline 16-pin package)
• Essence: The PCF8574ANG4 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 units

Specifications

• Supply Voltage: 2.5V to 6V
• Input/Output Voltage: 0V to VDD
• 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 PCF8574ANG4 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

• I/O Expansion: The PCF8574ANG4 provides 8 additional I/O ports, which can be used as either inputs or outputs.
• Interrupt Functionality: The IC has an interrupt output (INT) that can be used to notify the microcontroller of changes in the input states.
• Low Power Consumption: The device operates at low power, making it suitable for battery-powered applications.
• Address Selectable: The address of the PCF8574ANG4 can be configured using the A0, A1, and A2 pins, allowing for up to 8 devices to be connected on the same I2C-bus.

Advantages and Disadvantages

Advantages: - Easy I/O expansion for microcontrollers - Simple integration with I2C-bus protocol - Interrupt functionality for efficient event handling - Low power consumption

Disadvantages: - Limited number of I/O ports (8) - Requires external pull-up resistors for I2C-bus communication

Working Principles

The PCF8574ANG4 is controlled through the I2C-bus interface. It acts as a slave device, receiving commands from the master (microcontroller) and responding accordingly. The I/O ports can be configured as inputs or outputs by writing appropriate values to the corresponding registers. Changes in the input states can trigger an interrupt, which can be used to prompt the microcontroller to take necessary actions.

Detailed Application Field Plans

The PCF8574ANG4 finds applications in various fields, including but not limited to:

1. Home Automation: Used to control and monitor various devices such as lights, fans, and sensors.
2. Industrial Automation: Enables expansion of I/O capabilities in industrial control systems.
3. Robotics: Provides additional I/O ports 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 systems, such as dashboard controls and sensors.

Detailed and Complete Alternative Models

1. PCF8574A: Similar to PCF8574ANG4, but with different package options (e.g., DIP16).
2. MCP23017: 16-bit I/O expander with similar features and I2C-bus interface.
3. MAX7313: 16-bit I/O expander with interrupt functionality and higher maximum output current.
4. SX1509: 16-channel I/O expander with advanced features like LED driver and keypad scanning.

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

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