16x2 LCD Backpack Module - I2C expansion for LCD - PCF8574 TWI/I2C Port Expansion 

This PCF8574 based module is a versatile I/O port expansion module. It is basically a I2C based port enpansion module which can convert any 8 bit data from I2C serial to 8-bit parallel. LCD if used with this module will require only 2 GPIO lines that will save a lot of hardware resources.

PCF8574 Datasheet [NXP]

Features

1. Onboard trimpot for LCD contrast adjustment.
2. Standard 2 Wire Interface, I2C/TWI
3. Backlight enable through Jumper
4. On board Power LED
5. Works at 5V DC.

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