PCF8574ADWE4

Product Overview

• Category: Integrated Circuit (IC)
• Use: I/O Expander
• Characteristics: 8-bit remote I/O expander for I2C-bus with interrupt
• Package: SOIC (Small Outline Integrated Circuit) package
• Essence: The PCF8574ADWE4 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
• Operating Temperature Range: -40°C to +85°C
• I2C-bus Interface: Compatible with I2C-bus Fast-mode, Standard-mode, and SMBus protocols
• Interrupt Output: Active LOW open-drain output

Detailed Pin Configuration

The PCF8574ADWE4 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. GND: Ground
14. VCC: Supply voltage
15. SDA: Serial data line (I2C-bus)
16. SCL: Serial clock line (I2C-bus)

Functional Features

• 8-bit I/O Expander: Provides additional digital input/output pins for microcontrollers or other devices.
• I2C-bus Interface: Allows easy communication with the host device using the popular I2C-bus protocol.
• Interrupt Output: Generates an interrupt signal to the host device when a change in the input status is detected.
• Low Power Consumption: Operates at low power levels, making it suitable for battery-powered applications.
• Address Selectable: The address of the PCF8574ADWE4 can be configured by setting the A0, A1, and A2 pins, allowing multiple devices to be used on the same I2C-bus.

Advantages and Disadvantages

Advantages: - Easy to use and integrate into existing systems. - Provides additional I/O pins without requiring complex wiring or circuitry. - Compatible with a wide range of microcontrollers and devices. - Low power consumption extends battery life in portable applications.

Disadvantages: - Limited to 8-bit I/O expansion, may not be sufficient for complex systems requiring more I/O pins. - Requires knowledge of the I2C-bus protocol for proper integration.

Working Principles

The PCF8574ADWE4 operates as an I/O expander by communicating with the host device through the I2C-bus interface. It receives commands and data from the host device and controls the state of its 8 I/O pins accordingly. The interrupt output pin can be used to notify the host device of any changes in the input status, allowing for efficient event-driven programming.

Detailed Application Field Plans

The PCF8574ADWE4 finds applications in various fields, including but not limited to:

1. Home Automation: Used to expand the I/O capabilities of home automation systems, allowing control of lights, appliances, and sensors.
2. Industrial Control Systems: Enables the connection of multiple sensors, actuators, and other devices to a central controller in industrial automation applications.
3. Robotics: Provides additional I/O pins for controlling motors, sensors, and other components in robotic systems.
4. IoT (Internet of Things): Facilitates the integration of sensors and actuators into IoT devices, enabling data collection and remote control.

Detailed and Complete Alternative Models

1. PCF8574APW: Similar to PCF8574ADWE4 but available in TSSOP (Thin Shrink Small Outline Package) package.
2. MCP23017: 16-bit I/O expander with similar features, compatible with I2C-bus protocol.
3. MAX7313: 16-bit I/O expander with interrupt output, suitable for more complex I/O expansion requirements.

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