PCF8574ADGVRG4

Overview

• Category: Integrated Circuit (IC)
• Use: I/O Expander
• Characteristics: 8-bit remote I/O expander for I2C-bus with interrupt
• Package: TSSOP-20
• Essence: The PCF8574ADGVRG4 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 tape and reel packaging, with 2500 units per reel.

Specifications

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

Pin Configuration

The PCF8574ADGVRG4 has a total of 20 pins, which are assigned as follows:

1. P0: I/O Port 0
2. P1: I/O Port 1
3. P2: I/O Port 2
4. P3: I/O Port 3
5. P4: I/O Port 4
6. P5: I/O Port 5
7. P6: I/O Port 6
8. P7: I/O Port 7
9. GND: Ground
10. SDA: Serial Data Line (I2C-bus)
11. SCL: Serial Clock Line (I2C-bus)
12. INT: Interrupt Output 13-20: NC (No Connection)

Functional Features

• Bidirectional I/O Ports: Each of the 8 ports can be individually configured as input or output.
• Interrupt Output: The INT pin can be used to generate an interrupt signal to the microcontroller when any of the I/O ports change state.
• Low Standby Current: The PCF8574ADGVRG4 has a low standby current consumption, making it suitable for battery-powered applications.
• Address Select Pins: The device supports up to 8 different addresses, allowing multiple PCF8574ADGVRG4 devices to be connected on the same I2C-bus.

Advantages and Disadvantages

Advantages: - Easy to use and interface with microcontrollers using the I2C-bus protocol. - Provides additional I/O pins, expanding the capabilities of the host device. - Low power consumption in standby mode. - Multiple devices can be connected on the same bus.

Disadvantages: - Limited maximum output and sink current per channel. - Requires external pull-up resistors for the I2C-bus lines.

Working Principles

The PCF8574ADGVRG4 is controlled through the I2C-bus interface. It acts as a slave device, receiving commands and data from the master device (e.g., microcontroller). The I/O ports can be configured as either inputs or outputs by writing appropriate values to the corresponding control registers. The device can also generate an interrupt signal to the microcontroller when any of the I/O ports change state.

Application Field Plans

The PCF8574ADGVRG4 finds applications in various fields, including but not limited to:

1. Industrial Automation: Used to expand the number of I/O pins in PLCs (Programmable Logic Controllers) and industrial control systems.
2. Home Automation: Enables the control of multiple devices and sensors in smart home systems.
3. Automotive Electronics: Used for I/O expansion in automotive control units and infotainment systems.
4. Consumer Electronics: Integrated into devices such as remote controls, gaming consoles, and audio equipment to provide additional I/O capabilities.

Alternative Models

1. PCF8574APW: Same functionality but available in a different package (TSSOP-24).
2. MCP23008: Similar I/O expander with 8-bit I/O ports and I2C-bus interface.
3. MAX7313: 16-bit I/O expander with I2C-bus interface and higher maximum output current per channel.

Note: This is not an exhaustive list, and there are other alternative models available in the market.

In conclusion, the PCF8574ADGVRG4 is a versatile I/O expander that provides additional input/output pins using the I2C-bus protocol. Its compact package, low power consumption, and interrupt capability make it suitable for various applications in industrial automation, home automation, automotive electronics, and consumer electronics.