PCF8574T 8-Bit I2C IO Expander Module

The PCF8574T I2C IO Expander Module is an essential component for expanding the input/output capabilities of your microcontroller projects. This compact module provides eight additional GPIO pins controlled through the I2C interface, requiring only two communication lines (SDA and SCL) from your main controller. Perfect for projects where GPIO pins are limited, such as Arduino, Raspberry Pi, ESP8266, and STM32 applications.

The module features onboard DIP switches that allow you to configure the I2C address, enabling you to connect up to eight PCF8574T modules on the same I2C bus for a total of 64 additional IO pins. Each pin can be configured as either input or output, providing maximum flexibility for your design needs. The module includes pull-up resistors and ensures reliable communication at standard I2C speeds.

Ideal applications include LCD display control, LED matrix driving, keypad scanning, relay control, sensor interfacing, and industrial automation systems. The module operates at 5V, making it compatible with most common microcontroller platforms. With its simple two-wire interface and easy-to-use library support, expanding your project’s IO capabilities has never been easier.

Specification :

• IC Chip: PCF8574T
• Interface: I2C/IIC (Two-Wire)
• IO Pins: 8-bit (P0-P7)
• Operating Voltage: 2.5V – 6V (5V recommended)
• I2C Address: Configurable via DIP switches (0x20-0x27)
• Maximum Current per Pin: 25mA
• I2C Speed: Up to 100 kHz (Standard Mode)
• Pull-up Resistors: Onboard (10kΩ)
• Address Configuration: 3-bit DIP switch (A0, A1, A2)
• Pin Configuration: Bidirectional (Input/Output)
• Operating Temperature: -40°C to +85°C
• Board Dimensions: 23mm × 16mm (approx.)
• Pin Headers: 2.54mm pitch
• Power Indicator: LED included
• Compatible Platforms: Arduino, Raspberry Pi, ESP8266, ESP32, STM32