PCF8575CPWR

Overview

• Category: Integrated Circuit
• Use: I/O Expander
• Characteristics: 16-bit remote I/O expander for I2C-bus with interrupt
• Package: TSSOP (Thin Shrink Small Outline Package)
• Essence: The PCF8575CPWR is a 16-bit remote I/O expander designed for use in applications where additional I/Os are required. It provides general-purpose remote I/O expansion via the two-wire bidirectional I2C-bus (serial clock (SCL), serial data (SDA)).

Specifications

• Supply Voltage Range: 2.3V to 5.5V
• Input/Output Voltage Range: 0V to VDD
• Maximum Output Current: 25mA per bit
• Maximum Total Current: 200mA
• Operating Temperature Range: -40°C to +85°C
• I2C-bus Frequency: Up to 400kHz

Pin Configuration

The PCF8575CPWR has a total of 24 pins, which are assigned as follows:

1. SDA: Serial Data Input/Output
2. SCL: Serial Clock Input 3-10. P0-P7: General Purpose I/O Pins (Bit 0 to Bit 7) 11-18. P10-P17: General Purpose I/O Pins (Bit 8 to Bit 15)
3. INT: Interrupt Output
4. A0: Address Input Bit 0
5. A1: Address Input Bit 1
6. A2: Address Input Bit 2
7. GND: Ground
8. VDD: Supply Voltage

Functional Features

• Bidirectional I/O Lines: Each of the 16 I/O pins can be individually configured as an input or output.
• Interrupt Output: The INT pin can be configured to generate an interrupt signal when a change in input state is detected.
• I2C-bus Interface: The PCF8575CPWR communicates with the microcontroller or other devices via the I2C-bus, allowing for easy integration into existing systems.
• Low Standby Current: The device has a low standby current consumption, making it suitable for battery-powered applications.

Advantages and Disadvantages

Advantages: - Provides additional I/Os without the need for complex wiring - Easy integration into existing systems through the I2C-bus interface - Low standby current consumption

Disadvantages: - Limited maximum output current per bit (25mA) - Limited total current capacity (200mA)

Working Principles

The PCF8575CPWR works by communicating with a microcontroller or other devices through the I2C-bus. It acts as a remote I/O expander, allowing the microcontroller to control and monitor additional I/O pins without the need for complex wiring. The bidirectional I/O lines can be individually configured as inputs or outputs, providing flexibility in system design. The device also features an interrupt output that can be used to notify the microcontroller of changes in input states.

Application Field Plans

The PCF8575CPWR finds applications in various fields where additional I/O expansion is required. Some potential application areas include:

1. Industrial Automation: Used to expand the number of I/Os in industrial control systems, allowing for more sensors and actuators to be connected.
2. Home Automation: Enables the control of multiple devices and sensors in smart home systems, enhancing functionality and connectivity.
3. Automotive Electronics: Used for expanding I/O capabilities in automotive applications, such as controlling lights, switches, and sensors.
4. Internet of Things (IoT): Facilitates the connection of multiple devices in IoT applications, enabling data collection and control.

Alternative Models

• PCF8574: 8-bit remote I/O expander for I2C-bus
• MCP23017: 16-bit I/O expander with serial interface
• MAX7313: 16-bit I/O expander with interrupt output

These alternative models offer similar functionality and can be considered as alternatives to the PCF8575CPWR depending on specific requirements and system compatibility.

In conclusion, the PCF8575CPWR is a versatile 16-bit remote I/O expander designed for easy integration into various applications. Its bidirectional I/O lines, I2C-bus interface, and low standby current consumption make it a suitable choice for expanding I/O capabilities in different fields.