Product Description
The PCF8575 16-Channel I²C I/O Expansion Module is a compact and efficient solution for projects requiring additional digital I/O ports. Using the I²C communication interface, it allows developers to easily expand microcontroller or single-board computer GPIO capabilities without increasing pin usage.
Each PCF8575 module provides 16 configurable digital I/O channels, and with 3 address select pins, up to 8 modules can be used on the same I²C bus, enabling a total of 128 I/O lines. With low power consumption and wide voltage compatibility, this module is ideal for automation, robotics, IoT, and other electronics projects where multiple sensors, LEDs, or relays need to be controlled.
Specifications
Interface: I²C (Inter-Integrated Circuit)
Number of Channels: 16 digital I/O ports
Operating Voltage: 2.5V – 6V
Input/Output Voltage: Same as operating voltage
Current Consumption: <1mA (active mode), <1µA (standby mode)
Pull-Up Resistors: Internal 10kΩ pull-ups for each I/O pin
Address Select Pins: 3 (support up to 8 unique I²C addresses)
Module Dimensions: 32.2 × 21 mm
Datasheet: https://www.ti.com/lit/gpn/PCF8575
Key Features
Expands microcontroller I/O pins by 16 channels per module
Compatible with Arduino, Raspberry Pi, STM32, ESP8266/ESP32, and other I²C-enabled devices
Stackable: up to 8 modules on one bus (128 I/O lines total)
Internal pull-up resistors for stable signal handling
Ultra-low standby current for power-sensitive applications
Wide operating voltage range (2.5V – 6V) for flexible integration
Compact PCB design, easy to mount and integrate
Applications
I/O expansion for Arduino, Raspberry Pi, STM32, ESP32, and other MCUs
Robotics projects with multiple sensors or actuators
LED matrix and display driving
Relay and switch control in automation systems
IoT projects requiring additional GPIO lines
Data acquisition systems
Package Includes
Why Choose This Module?
The PCF8575 I²C I/O Expander is a simple yet powerful way to overcome the GPIO limitations of your microcontroller. With low power usage, stackable design, and flexible compatibility, it’s the perfect choice for projects that demand more connections without extra complexity.
