PCF8574RGYR

Product Overview

• Category: Integrated Circuit (IC)
• Use: I/O Expander
• Characteristics: 8-bit remote I/O expander for I2C-bus with interrupt
• Package: VQFN-16
• Essence: The PCF8574RGYR is a versatile I/O expander that allows users to increase the number of input/output pins on a microcontroller 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 I2C Fast-Mode, Standard-Mode, and SMBus protocols
• Interrupt Output: Active-low open-drain output

Detailed Pin Configuration

The PCF8574RGYR has a total of 16 pins arranged as follows:

1. SDA: Serial Data Input/Output pin for I2C communication
2. SCL: Serial Clock Input pin for I2C communication
3. A0: Address Bit 0 for device addressing
4. A1: Address Bit 1 for device addressing
5. A2: Address Bit 2 for device addressing
6. INT: Interrupt Output pin
7. P0-P7: General Purpose Input/Output pins

Functional Features

• Expandable I/O: The PCF8574RGYR provides 8 additional I/O pins, allowing for increased connectivity and flexibility in system design.
• I2C-bus Interface: The device communicates with the host microcontroller or other devices through the I2C-bus protocol, enabling easy integration into existing systems.
• Interrupt Functionality: The PCF8574RGYR supports an interrupt output pin that can be used to notify the host microcontroller of changes in input states, reducing the need for continuous polling.
• Low Power Consumption: The device operates at low power levels, making it suitable for battery-powered applications.

Advantages and Disadvantages

Advantages: - Easy Integration: Compatible with standard I2C-bus protocols, ensuring seamless integration into various systems. - Expandability: Provides additional I/O pins, allowing for increased connectivity options. - Interrupt Support: Built-in interrupt functionality reduces the need for constant polling, saving processing resources.

Disadvantages: - Limited Output Current: Each I/O pin has a maximum output current of 25mA, which may not be sufficient for certain high-power applications. - Addressing Limitation: The device supports up to 8 unique addresses, limiting the number of expanders that can be used in a single system.

Working Principles

The PCF8574RGYR functions as an I/O expander by communicating with the host microcontroller or other devices using the I2C-bus protocol. It acts as a bridge between the microcontroller and external peripherals, providing additional I/O pins for input and output operations. The device can be addressed using three address bits (A0, A1, and A2), allowing for multiple expanders to coexist on the same I2C-bus.

Detailed Application Field Plans

The PCF8574RGYR finds applications in various fields, including but not limited to:

1. Home Automation: Used to control and monitor various home appliances and sensors.
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 peripheral devices.
4. IoT Devices: Facilitates connectivity and control of IoT devices through the I2C-bus interface.
5. Automotive Electronics: Used for expanding I/O capabilities in automotive control systems.

Detailed and Complete Alternative Models

1. PCF8574APW: Similar to PCF8574RGYR but available in a TSSOP-16 package.
2. MCP23017-E/SP: 16-bit I/O expander with I2C-bus interface, available in a DIP-28 package.
3. MAX7313AUG+: 16-bit I/O expander with serial interface, available in a TSSOP-24 package.
4. PCA9555PW: 16-bit I/O expander with I2C-bus interface, available in a TSSOP-24 package.

These alternative models offer similar functionality and can be used as substitutes for the PCF8574RGYR depending on specific requirements and availability.

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