PCF8575CDBE4

Product Overview

• Category: Integrated Circuit (IC)
• Use: I/O Expander
• Characteristics: 16-bit remote I/O expander for I2C-bus with interrupt
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: The PCF8575CDBE4 is a versatile I/O expander that provides an easy way to increase the number of I/O pins available in a microcontroller-based system.
• Packaging/Quantity: The PCF8575CDBE4 is typically sold in reels of 2500 units.

Specifications

• Number of I/O Pins: 16
• Supply Voltage Range: 2.5V to 6V
• I2C-bus Interface: Compatible with standard-mode, fast-mode, and fast-mode plus
• Interrupt Output: Active-low open-drain output
• Operating Temperature Range: -40°C to +85°C
• Package Type: SOIC-24

Detailed Pin Configuration

The PCF8575CDBE4 has a total of 24 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. P7: I/O Port 7
6. P6: I/O Port 6
7. P5: I/O Port 5
8. P4: I/O Port 4
9. P3: I/O Port 3
10. P2: I/O Port 2
11. P1: I/O Port 1
12. P0: I/O Port 0
13. INT: Interrupt Output
14. SDA: I2C-bus Serial Data Line
15. SCL: I2C-bus Serial Clock Line
16. VCC: Supply Voltage
17. P15: I/O Port 15
18. P14: I/O Port 14
19. P13: I/O Port 13
20. P12: I/O Port 12
21. P11: I/O Port 11
22. P10: I/O Port 10
23. P9: I/O Port 9
24. P8: I/O Port 8

Functional Features

• Remote I/O Expansion: The PCF8575CDBE4 allows for easy expansion of I/O pins in a microcontroller-based system, enabling the connection of additional devices or sensors.
• Interrupt Functionality: The interrupt output pin (INT) can be used to notify the microcontroller when any of the I/O pins change their state, reducing the need for continuous polling.
• I2C-bus Interface: The PCF8575CDBE4 utilizes the popular I2C-bus interface, making it compatible with a wide range of microcontrollers and other I2C-bus devices.
• Low Power Consumption: The device operates at low power levels, making it suitable for battery-powered applications.

Advantages and Disadvantages

Advantages

• Easy I/O Expansion: The PCF8575CDBE4 simplifies the process of adding more I/O pins to a microcontroller system without the need for complex wiring or additional hardware.
• Interrupt Capability: The interrupt functionality reduces the burden on the microcontroller by providing a signal when I/O pin states change, allowing for efficient event-driven programming.
• Wide Compatibility: The I2C-bus interface ensures compatibility with various microcontrollers and other I2C-bus devices, offering flexibility in system design.
• Low Power Consumption: The device's low power consumption makes it suitable for energy-efficient applications.

Disadvantages

• Limited I/O Pins: The PCF8575CDBE4 provides 16 additional I/O pins, which may not be sufficient for complex systems requiring a large number of inputs and outputs.
• Dependency on I2C-bus: The device relies on the I2C-bus interface for communication, which may introduce additional complexity in system design and potential bus contention issues.

Working Principles

The PCF8575CDBE4 operates as an I/O expander by communicating with a microcontroller or other devices through the I2C-bus interface. It uses the address inputs (A0, A1, A2) to set its unique address, allowing multiple PCF8575CDBE4 devices to coexist on the same bus. The microcontroller can control the state of each I/O pin by writing to the corresponding register via the I2C-bus. The interrupt output (INT) can be configured to generate an interrupt signal when any of the I/O pins change their state, providing efficient event-driven functionality.

Detailed Application Field Plans