PCF8574T I2C to 8 Bit Digital I/O Port Expander Module

This module allows you to connect up to 8 digital I/O ports to a single device on the I2C Bus, this means you can gain up to 6 digital I/O ports (or 8 if the 12C bus is already being used) so you can connect more devices to your project. This module also features 3-dip switches to change the I2C address this means up to 8 of these devices can be connected on the I2C bus to gain up to 64 additional I/O ports on your project.

Specification:
Voltage: 2.5-6 VDC
Power Consumption: 100 µA(active), 10 µA (Stand-By)
Logic level: 3.3 -or- 5VDC(Dependent on Power Voltage)

Connection Pinout:
VCC: Supply Voltage
GND: Ground
SDA: I2C Data
SDL: I2C Clock
P0-P7: Digital I/O
/INT: Interrupt Output
A0-A2: I2C Address Configuration