PCF8574DWR

Product Overview

• Category: Integrated Circuit (IC)
• Use: I/O Expander
• Characteristics: 8-bit remote I/O expander for I2C-bus, low standby current consumption, wide supply voltage range
• Package: SO-20
• Essence: PCF8574DWR is a popular I/O expander IC used to increase the number of input/output pins of a microcontroller or other devices.
• Packaging/Quantity: Tape and Reel, 2500 pieces per reel

Specifications

• Supply Voltage Range: 2.5V to 6V
• Input/Output Voltage Range: 0V to VCC
• Standby Current Consumption: 10µA maximum
• Operating Temperature Range: -40°C to +85°C
• I2C-bus Interface: Compatible with I2C-bus Fast-mode, Standard-mode, and SMBus specifications

Detailed Pin Configuration

The PCF8574DWR has a total of 20 pins in a Small Outline (SO) package. The pin configuration is 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. GND: Ground
10. P5: I/O Port 5
11. P6: I/O Port 6
12. P7: I/O Port 7
13. SDA: Serial Data Line
14. SCL: Serial Clock Line
15. INT: Interrupt Output
16. VCC: Supply Voltage
17. NC: No Connection
18. NC: No Connection
19. NC: No Connection
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 input pins change state.
• I2C-bus Interface: The PCF8574DWR communicates with the microcontroller using the I2C-bus protocol, allowing for easy integration into existing systems.

Advantages and Disadvantages

Advantages: - Simple and straightforward interface with the microcontroller via I2C-bus. - Low standby current consumption helps in reducing overall power consumption. - Wide supply voltage range allows for compatibility with various systems.

Disadvantages: - Limited number of I/O pins (8) compared to other expanders available in the market. - Slower data transfer rate compared to some other I/O expander ICs.

Working Principles

The PCF8574DWR works by communicating with the microcontroller through the I2C-bus interface. It acts as a bridge between the microcontroller and external devices, expanding the number of available I/O pins. The microcontroller sends commands and data to the PCF8574DWR, which then controls the corresponding I/O ports based on the received instructions.

Detailed Application Field Plans

The PCF8574DWR is widely used in various applications where additional I/O pins are required. Some common application fields include:

1. Home Automation Systems: Used to control and monitor various home appliances and sensors.
2. Industrial Automation: Integrated into industrial control systems for monitoring and controlling equipment.
3. Robotics: Enables communication between microcontrollers and peripheral devices in robotic systems.
4. IoT Devices: Used in Internet of Things (IoT) devices to expand the number of available I/O pins for sensor inputs and actuator outputs.
5. Automotive Electronics: Integrated into automotive systems for controlling lights, sensors, and other peripherals.

Detailed and Complete Alternative Models

1. MCP23017: 16-bit I/O expander with higher number of I/O pins.
2. MAX7313: 16-bit I/O expander with integrated LED drivers.
3. PCA9538: 8-bit I/O expander with interrupt output and hardware address pins.

These alternative models offer similar functionality to the PCF8574DWR and can be considered based on specific project requirements.

Word count: 536 words