PCF8574DGVR

Product Overview

• Category: Integrated Circuit
• Use: I/O Expander
• Characteristics: 8-bit remote I/O expander for I2C-bus with interrupt
• Package: TSSOP (Thin Shrink Small Outline Package)
• Essence: PCF8574DGVR is a versatile integrated circuit that expands the number of input/output (I/O) pins available to a microcontroller or other digital device. It communicates with the host device through the I2C-bus protocol and provides 8 additional I/O pins.
• Packaging/Quantity: PCF8574DGVR is typically sold 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
• Operating Temperature Range: -40°C to +85°C
• I2C-bus Interface: Compatible with standard-mode, fast-mode, and high-speed mode

Pin Configuration

The PCF8574DGVR 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. SDA: Serial Data Line
14. SCL: Serial Clock Line
15. GND: Ground
16. VDD: Supply Voltage

Functional Features

• I/O Expansion: PCF8574DGVR provides 8 additional I/O pins, allowing the host device to control more external components or read more input signals.
• Interrupt Functionality: The INT pin can be configured to generate an interrupt signal to the host device when a change in the state of any of the I/O pins is detected.
• Low Power Consumption: PCF8574DGVR operates at low power levels, making it suitable for battery-powered applications.
• I2C-bus Compatibility: It supports various I2C-bus modes, enabling easy integration with microcontrollers and other devices.

Advantages and Disadvantages

Advantages: - Simple and straightforward interface through the I2C-bus protocol. - Provides additional I/O pins without requiring complex wiring. - Low power consumption extends battery life in portable applications.

Disadvantages: - Limited number of I/O pins (8) compared to some other expanders. - Slower data transfer rate compared to some newer I/O expander ICs.

Working Principles

PCF8574DGVR communicates with the host device using the I2C-bus protocol. The host device acts as the master and initiates communication by sending commands and data to the PCF8574DGVR. The PCF8574DGVR, acting as the slave, receives these commands and data and performs the requested operations on its I/O pins.

The I2C-bus allows multiple devices to be connected together, and each device has a unique address. PCF8574DGVR has three address inputs (A0, A1, A2), which can be set to different logic levels to assign a unique address to each device on the bus.

Detailed Application Field Plans

PCF8574DGVR finds applications in various fields, including but not limited to:

1. Industrial Automation: It can be used to expand the number of I/O pins available to programmable logic controllers (PLCs) or industrial control systems.
2. Home Automation: PCF8574DGVR enables the control of multiple devices and sensors in smart home systems.
3. Robotics: It can be utilized to interface with various sensors, actuators, and peripheral devices in robotic systems.
4. Automotive Electronics: PCF8574DGVR can be employed for expanding I/O capabilities in automotive control units and infotainment systems.
5. IoT (Internet of Things): It facilitates the connection of multiple sensors and actuators to IoT devices, enabling data acquisition and control.

Detailed and Complete Alternative Models

• MCP23017: 16-bit I/O expander with I2C-bus/SPI interface
• MAX7313: 16-bit I/O expander with serial interface
• PCA9538: 8-bit I/O expander with I2C-bus interface
• SX1509: 16-channel I/O expander with LED driver