🔌 PCF8574T I/O For I2C (IIC) Port Interface Support Cascading Extended Module

📖 Product Description

The PCF8574T I/O Expansion Module is a compact and efficient solution for extending the GPIO capabilities of microcontrollers via the I²C (IIC) bus. Based on the NXP PCF8574T chip, the module provides 8 additional digital input/output pins while using only two communication lines: SDA and SCL.

It is ideal for projects where available GPIO pins are limited, including Arduino, ESP8266, ESP32, STM32, Raspberry Pi and other embedded platforms.

Thanks to its address selection capability, multiple modules can be connected to the same I²C bus, allowing expansion up to 64 or even 128 additional I/O channels when combined with PCF8574A devices. :contentReference[oaicite:1]{index=1}

⭐ Key Features

✅ 8 additional programmable GPIO pins

✅ I²C (IIC) communication interface

✅ Requires only SDA and SCL signals

✅ Each pin configurable as input or output

✅ Address selection via A0, A1 and A2 pins

✅ Cascading support for multiple modules

✅ Interrupt output (INT)

✅ Ultra-low power consumption

✅ Direct LED driving capability

✅ Compatible with 3.3V and 5V logic systems

⚙️ Technical Specifications

Parameter	Value
IC Chip	PCF8574T
Interface	I²C (IIC)
Operating Voltage	2.5V – 6V DC
GPIO Channels	8
Bus Speed	Up to 100 kHz
Address Pins	A0, A1, A2
Available Addresses	8
Maximum Modules per Bus	8
Maximum Expansion	64 I/O
Interrupt Output	INT (Active LOW)
Logic Levels	3.3V / 5V
Current per Pin	Up to ±25 mA
Pin Pitch	2.54 mm

🔧 Applications

• Arduino projects
• ESP8266 / ESP32 development
• Raspberry Pi systems
• LCD interface expansion
• Keypad scanning
• Button monitoring
• Relay control
• LED control
• Smart home automation
• IoT devices

📦 Package Includes

• 1 × PCF8574T I²C GPIO Expansion Module

💡 Advantages

The module allows significant GPIO expansion using only two I²C communication lines. It offers easy integration, low power consumption and excellent compatibility with popular development platforms.