PCF8574 PCF8574T MODULE IO EXTENSION I/O I2C CONVERTER BOARD

PCF8574T I2C I/O Extension Module is a versatile input/output expander that adds 8 additional digital I/O pins to your microcontroller via the I2C bus. This compact module is perfect for projects requiring extra GPIO pins while maintaining a simple two-wire interface, making it ideal for Arduino, Raspberry Pi, and other embedded systems.

Key Features of PCF8574T Module:

• • 8-Bit I/O Expansion: Adds 8 configurable digital pins
  • I2C Interface: Simple 2-wire communication (SDA, SCL)
  • Wide Voltage Compatibility: Works with 2.5V-6V systems
  • Interrupt Output: Pin-change notification capability
  • Cascadable: Up to 8 modules on a single I2C bus

Technical Specifications:

• • IC: PCF8574T (Texas Instruments)
  • I/O Pins: 8 bidirectional (quasi-bidirectional)
  • I2C Address Range: 0x20-0x27 (configurable with jumpers)
  • Voltage Range: 2.5V to 6V operation
  • Current Sink/Source: 25mA per I/O pin
  • Frequency: 100kHz standard I2C, 400kHz fast mode
  • Operating Temperature: -40°C to +85°C

Module Components:

• • PCF8574T I/O expander IC
  • I2C address selection jumpers (A0-A2)
  • Power indicator LED
  • 4-pin header (VCC, GND, SDA, SCL)
  • 8-pin header for I/O connections
  • 10kΩ pull-up resistors on I2C lines

Pin Configuration:

• • VCC: 2.5V-6V power input
  • GND: Ground connection
  • SDA: I2C data line
  • SCL: I2C clock line
  • INT: Interrupt output (active low)
  • P0-P7: 8 configurable I/O pins
  • A0-A2: I2C address selection pins

Typical Applications:

• • Button/LED Expansion: Add more buttons or LEDs to your project
  • Sensor Arrays: Connect multiple digital sensors
  • LCD Control: Interface with character LCD displays
  • Relay Control: Drive multiple relays with limited GPIO
  • DIY Projects: General-purpose I/O expansion

Wiring Example (Arduino):

• • VCC → 5V
  • GND → GND
  • SDA → A4 (or SDA pin)
  • SCL → A5 (or SCL pin)
  • P0-P7 → Connect to your devices

Equivalent Models:

• • MCP23017 I2C Expander: 16-bit I/O expander with more features
  • PCF8575 I2C Expander: 16-bit version of PCF8574

Datasheet:

• • Download PCF8574T Datasheet

Keywords:

• • PCF8574T Module
  • I2C I/O Expander
  • GPIO Extension Board
  • I2C Port Expander
  • Arduino I/O Expansion

Package Includes:

• • 1 × PCF8574 IO Expansion Board 8Bit Parallel Expander I2C-Bus Evaluation Development Module