PCA8574D,512

Product Overview

• Category: Integrated Circuit
• Use: I/O Expander
• Characteristics: 8-bit remote I/O expander for I2C-bus with interrupt
• Package: SO16 (Small Outline 16-pin)
• Essence: The PCA8574D,512 is a versatile I/O expander that can be controlled through the I2C-bus interface. It provides an easy way to increase the number of I/O ports available in a microcontroller-based system.
• Packaging/Quantity: Available in tape and reel packaging, with 2500 units per reel.

Specifications

• Supply Voltage Range: 2.3V to 5.5V
• I2C-bus Interface: Compatible with I2C Fast-Mode (400 kHz) and Standard-Mode (100 kHz)
• Number of I/O Ports: 8
• Interrupt Output: Active-low open-drain output
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The PCA8574D,512 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. VCC: Supply Voltage

Functional Features

• I/O Expansion: The PCA8574D,512 provides 8 additional I/O ports that can be used for input or output operations.
• Interrupt Functionality: It supports an interrupt output that can be used to notify the microcontroller when any of the I/O ports change their state.
• Low Power Consumption: The device has a low standby current consumption, making it suitable for battery-powered applications.
• Address Selectable: The address inputs (A0, A1, A2) allow multiple devices to be connected on the same I2C-bus, expanding the number of available I/O ports even further.

Advantages and Disadvantages

Advantages: - Easy Integration: The PCA8574D,512 can be easily integrated into existing systems using the I2C-bus interface. - Versatility: It can be used in various applications that require additional I/O ports, such as industrial control systems, home automation, and automotive electronics. - Cost-effective: The device offers a cost-effective solution for expanding the I/O capabilities of microcontroller-based systems.

Disadvantages: - Limited Number of I/O Ports: The PCA8574D,512 provides only 8 additional I/O ports, which may not be sufficient for certain complex applications. - Dependency on I2C-bus: The device relies on the I2C-bus for communication, which may introduce additional complexity in the system design.

Working Principles

The PCA8574D,512 operates as a slave device on the I2C-bus. It communicates with the microcontroller by sending and receiving data through the SDA (Serial Data Line) and SCL (Serial Clock Line) pins. The microcontroller can read or write the state of the I/O ports by addressing the PCA8574D,512 using its unique I2C-bus address.

When an interrupt occurs (e.g., a change in the state of any I/O port), the PCA8574D,512 pulls the INT pin low to notify the microcontroller. The microcontroller can then read the current state of the I/O ports to determine the cause of the interrupt.

Detailed Application Field Plans

The PCA8574D,512 can be used in various applications, including:

1. Industrial Control Systems: It can be used to expand the number of I/O ports in PLCs (Programmable Logic Controllers) and other industrial control systems.
2. Home Automation: The device can be utilized in home automation systems to control and monitor various devices, such as lights, sensors, and actuators.
3. Automotive Electronics: It can be integrated into automotive electronics for tasks like controlling power windows, central locking systems, and dashboard displays.
4. IoT (Internet of Things): The PCA8574D,512 can be employed in IoT devices to provide additional I/O capabilities for sensor inputs and actuator outputs.

Detailed and Complete Alternative Models