PCA8574PW,112

Basic Information 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 PCA8574PW,112 is a versatile I/O expander that allows users to increase the number of input/output pins of a microcontroller or other devices using the I2C-bus interface.
• Packaging/Quantity: Available in reels of 2500 units

Specifications

• Supply Voltage Range: 2.3V to 5.5V
• I/O Voltage Range: 0V to VDD
• Maximum Output Current: 25mA per I/O pin
• Maximum Sink Current: 25mA per I/O pin
• I2C-bus Interface: Compatible with I2C Fast-Mode (400kHz) and Standard-Mode (100kHz)
• Interrupt Output: Active-low open-drain output
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The PCA8574PW,112 has a total of 16 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. INT: Interrupt Output
10. SDA: Serial Data Line (I2C-bus)
11. SCL: Serial Clock Line (I2C-bus)
12. GND: Ground
13. A0: Address Input 0
14. A1: Address Input 1
15. A2: Address Input 2
16. VDD: Supply Voltage

Functional Features

• Expandable I/O: The PCA8574PW,112 provides 8 additional I/O pins, allowing for increased connectivity and flexibility in system design.
• I2C-bus Interface: The device communicates with the microcontroller or other devices through the I2C-bus interface, enabling easy integration into existing systems.
• Interrupt Functionality: The interrupt output pin (INT) can be used to notify the microcontroller of changes on the I/O ports, reducing the need for continuous polling.
• Low Power Consumption: The PCA8574PW,112 operates at low power levels, making it suitable for battery-powered applications.

Advantages and Disadvantages

Advantages: - Easy Integration: Compatible with standard I2C-bus interface, simplifying system design. - Expandability: Provides additional I/O pins, increasing the connectivity options. - Interrupt Function: Allows for efficient event-driven programming by utilizing the interrupt output.

Disadvantages: - Limited Current Handling: The maximum output and sink current per I/O pin is limited to 25mA, which may not be sufficient for certain high-power applications. - Addressing Limitation: The device supports only 3 address inputs (A0, A1, A2), limiting the number of devices that can be connected on the same I2C-bus.

Working Principles

The PCA8574PW,112 functions as a remote I/O expander by communicating with a microcontroller or other devices using the I2C-bus protocol. It acts as a bridge between the microcontroller and external devices, providing additional I/O pins for input and output operations. The device can be controlled and configured through the I2C-bus interface, allowing the microcontroller to read or write data to the I/O ports.

Detailed Application Field Plans

The PCA8574PW,112 finds applications in various fields, including but not limited to: 1. Home Automation: Controlling and monitoring multiple sensors and actuators. 2. Industrial Automation: Expanding the number of I/O pins for controlling machinery and equipment. 3. Automotive Electronics: Adding extra I/O ports for interfacing with different automotive systems. 4. Internet of Things (IoT): Enabling connectivity and control of multiple devices in IoT applications. 5. Robotics: Increasing the number of I/O pins for sensor integration and actuator control.

Detailed and Complete Alternative Models

• PCA8574APW,112: Similar to PCA8574PW,112 but available in a different package (TSSOP).
• PCA9674PW,112: 8-bit I2C-bus/SMBus I/O port with reset.
• MCP23008-E/P: 8-bit I/O expander with I2C-bus interface.

These alternative models offer similar functionality and can be considered as