PCA8574D,518

Product Overview

• Category: Integrated Circuit (IC)
• Use: I/O Expander
• Characteristics:
  • 8-bit remote I/O port with I2C-bus interface
  • Low standby current consumption
  • Schmitt trigger input
  • Open-drain interrupt output
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: The PCA8574D,518 is a highly integrated I/O expander designed for use in various applications that require additional I/O ports.
• Packaging/Quantity: Available in tape and reel packaging, with 2500 units per reel.

Specifications

• Supply Voltage: 2.3V to 5.5V
• I/O Voltage: 1.8V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• I2C-bus Frequency: Up to 400 kHz
• Number of I/O Ports: 8
• Interrupt Output: Open-drain

Detailed Pin Configuration

The PCA8574D,518 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. GND: Ground
5. P0: I/O Port 0
6. P1: I/O Port 1
7. P2: I/O Port 2
8. P3: I/O Port 3
9. P4: I/O Port 4
10. P5: I/O Port 5
11. P6: I/O Port 6
12. P7: I/O Port 7
13. INT: Interrupt Output
14. SDA: I2C-bus Serial Data Line
15. SCL: I2C-bus Serial Clock Line
16. VCC: Supply Voltage

Functional Features

• Provides 8-bit remote I/O port expansion through the I2C-bus interface.
• Can be used as inputs or outputs individually.
• Supports interrupt capability to indicate changes in input states.
• Low standby current consumption, making it suitable for battery-powered applications.
• Schmitt trigger inputs ensure robust and noise-immune operation.

Advantages and Disadvantages

Advantages: - Easy integration with existing systems using the I2C-bus interface. - Flexible configuration of I/O ports based on application requirements. - Low power consumption for energy-efficient designs. - Robust operation with Schmitt trigger inputs.

Disadvantages: - Limited number of I/O ports (8) may not be sufficient for complex applications requiring a large number of I/Os. - Requires additional components (microcontroller, I2C-bus master) for full functionality.

Working Principles

The PCA8574D,518 is controlled through the I2C-bus interface, allowing communication with a microcontroller or other I2C-bus master devices. The device acts as an I/O expander, providing additional digital I/O ports that can be configured as inputs or outputs. Changes in the input states can be detected using the interrupt output pin (INT). The device operates at low power consumption levels, making it suitable for various battery-powered applications.

Detailed Application Field Plans

The PCA8574D,518 finds applications in various fields, including but not limited to:

1. Home Automation: Controlling and monitoring multiple devices such as lights, fans, and sensors.
2. Industrial Automation: Expanding the number of I/O ports in control systems and PLCs.
3. Automotive Electronics: Adding extra I/O ports for controlling peripheral devices in vehicles.
4. Internet of Things (IoT): Enabling connectivity and control of multiple sensors and actuators.
5. Robotics: Expanding the I/O capabilities of robotic systems for enhanced functionality.

Detailed and Complete Alternative Models

1. PCA8574D,112: Similar to PCA8574D,518 but available in a different package (TSSOP).
2. MCP23008: 8-bit I/O expander with I2C-bus interface from Microchip Technology.
3. PCF8574: 8-bit I/O expander with I2C-bus interface from NXP Semiconductors.
4. MAX7313: 16-bit I/O expander with I2C-bus interface from Maxim Integrated.

These alternative models offer similar functionality and can be considered based on specific requirements and availability.

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