The PCF8574 IO Expansion Board is an 8-bit remote I/O expander for the I2C-bus. It provides a simple solution when you need additional inputs or outputs for your microcontroller. This is the same chip often found on the back of I2C LCD modules, but in a standalone format that allows you to trigger relays, read switches, or drive LEDs. Because it supports I2C cascading, you can connect multiple boards in series to create a massive I/O matrix without wasting your controller’s precious pins.
Key Features
I2C Interface: Only uses 2 pins (SDA/SCL) to control 8 separate digital ports.
Bidirectional I/O: Each of the 8 pins can be used as either an input or an output.
Daisy-Chain Support: Features pin headers that allow you to plug one module into another to expand up to 64 I/O points.
Address Jumpers: Integrated jumpers/dip-switches to easily change the I2C address (0×20 to 0×27).
Interrupt Output: Includes an “INT” pin that alerts your microcontroller when an input state changes, saving CPU power.
Technical Specifications
Feature
Specification
Operating Voltage
2.5V to 6.0V DC
Interface
I2C (Standard & Fast mode)
I/O Pins
8 Bits (Bidirectional)
Max Current per Pin
25mA (Sink) / 10mA (Source)
Standby Current
10µA (Ultra-low power)
Logic Type
Open-drain interrupt output
Dimensions
48mm x 16mm
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