PCF8574APWR

Product Overview

• Category: Integrated Circuit (IC)
• Use: I/O Expander
• Characteristics: 8-bit remote I/O expander for I2C-bus with interrupt
• Package: TSSOP (Thin Shrink Small Outline Package)
• Essence: The PCF8574APWR 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 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 Total Output Current: 100mA
• Operating Temperature Range: -40°C to +85°C
• I2C-bus Frequency: Up to 400kHz

Detailed Pin Configuration

The PCF8574APWR 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. VCC: Supply Voltage

Functional Features

• Bidirectional I/O Ports: Each of the 8 I/O 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.
• I2C-bus Interface: The PCF8574APWR communicates with the microcontroller or other devices using the I2C-bus protocol, allowing for easy integration into existing systems.

Advantages and Disadvantages

Advantages: - Simple and straightforward I/O expansion solution. - Low power consumption. - Easy integration with microcontrollers using the I2C-bus protocol.

Disadvantages: - Limited number of I/O ports (8 in total). - Slower data transfer rate compared to some other communication protocols.

Working Principles

The PCF8574APWR works by utilizing the I2C-bus protocol to communicate with a microcontroller or other devices. It acts as an I/O expander, allowing the microcontroller to control or read the state of up to 8 additional I/O ports. The device can be addressed using the A0, A1, and A2 pins, enabling multiple PCF8574APWR ICs to be connected to the same I2C-bus.

Detailed Application Field Plans

The PCF8574APWR is commonly used in various applications where additional I/O ports are required. Some examples include:

1. Keypad Interfaces: The IC can be used to interface with a matrix keypad, providing a simple way to detect key presses.
2. LED Control: It can be used to control multiple LEDs, allowing for dynamic lighting effects or status indicators.
3. LCD Displays: The PCF8574APWR can be used to interface with LCD displays, enabling the microcontroller to send data and commands to the display.
4. Sensor Interfaces: It can be used to interface with various sensors, allowing for easy integration into sensor-based systems.

Detailed and Complete Alternative Models

1. PCF8574A: Similar to PCF8574APWR, but available in different package options such as PDIP (Plastic Dual In-line Package) and SO (Small Outline) package.
2. MCP23008: Another I/O expander IC with similar functionality, but offers 8 additional I/O ports compared to PCF8574APWR.
3. MAX7313: I/O expander IC with more advanced features such as programmable I/O port configurations and higher maximum output current.

These alternative models provide similar functionality to the PCF8574APWR and can be considered based on specific requirements or availability.

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