PCF8575DW

Product Overview

• Category: Integrated Circuit (IC)
• Use: I/O Expander
• Characteristics: 16-bit remote I/O expander for I2C-bus with interrupt
• Package: SO20 (Small Outline 20 pins)
• Essence: PCF8575DW is a versatile integrated circuit that expands the input/output (I/O) capabilities of microcontrollers or other devices through the I2C-bus communication protocol.
• Packaging/Quantity: Available in reels, with 2500 units per reel.

Specifications

• Supply Voltage Range: 2.5V to 6V
• Input/Output Voltage Range: 0V to VDD
• Maximum Output Current: 25mA per pin
• Maximum Total Current: 200mA
• I2C-bus Interface: Compatible with I2C Fast-mode and Standard-mode
• Interrupt Output: Active-low open-drain output
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The PCF8575DW has a total of 20 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. GND: Ground
10. A0: Address Input 0
11. A1: Address Input 1
12. A2: Address Input 2
13. SDA: Serial Data Line (I2C-bus)
14. SCL: Serial Clock Line (I2C-bus)
15. INT: Interrupt Output
16. VDD: Supply Voltage
17. P8: I/O Port 8
18. P9: I/O Port 9
19. P10: I/O Port 10
20. P11: I/O Port 11

Functional Features

• Expandable I/O: The PCF8575DW provides 16 additional I/O ports, which can be used as inputs or outputs.
• I2C-bus Communication: It utilizes the popular I2C-bus protocol for communication with microcontrollers or other devices.
• Interrupt Capability: The device has an interrupt output that can be used to notify the host controller of changes on the I/O ports.
• Low Power Consumption: The PCF8575DW is designed to operate with low power consumption, making it suitable for battery-powered applications.

Advantages and Disadvantages

Advantages: - Easy Integration: The PCF8575DW can be easily integrated into existing systems using the I2C-bus interface. - Versatility: It offers flexibility in expanding the I/O capabilities of various devices. - Interrupt Functionality: The interrupt output allows for efficient event-driven programming.

Disadvantages: - Limited Current Capacity: The maximum output current per pin is limited to 25mA, which may not be sufficient for some high-power applications. - Addressing Limitation: The device supports only three address inputs, limiting the number of devices that can be connected on the same bus.

Working Principles

The PCF8575DW works by receiving commands and data from a microcontroller or host device through the I2C-bus interface. It then translates these commands into appropriate actions on the I/O ports. The device can function as either an input expander or an output expander, depending on the configuration set by the host device.

Detailed Application Field Plans

The PCF8575DW finds applications in various fields, including but not limited to:

1. Industrial Automation: It can be used to expand the I/O capabilities of programmable logic controllers (PLCs) or industrial control systems.
2. Home Automation: The device enables the control and monitoring of multiple sensors, switches, or actuators in smart home systems.
3. Automotive Electronics: It can be utilized for expanding the I/O ports in automotive control units or infotainment systems.
4. Internet of Things (IoT): The PCF8575DW facilitates the integration of multiple sensors or actuators in IoT devices, enhancing their functionality.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the PCF8575DW are:

1. MCP23017: 16-bit I/O expander with I2C-bus interface.
2. MAX7313: 16-bit I/O expander with serial interface.
3. PCA9538: 8-bit I/O expander with I2C-bus interface.
4. SX1509: 16-channel GPIO expander with I2C