The SparkFun logic level converter is a small device that safely steps down 5V signals to 3.3V and steps up 3.3V to 5V. This level converter also works with 2.8V and 1.8V devices.
What really separates this Logic level converter from the previous versions is that you can successfully set your high and low voltages and step up and down between them safely on the same channel.Each level converter has the capability of converting 4 pins on the high side to 4 pins on the low side with two inputs and two outputs provided for each side.
The level converter is very easy to use. The board needs to be powered from the two voltages sources (high voltage and low voltage) that your system is using. High voltage (5V for example) to the ‘HV’ pin, low voltage (3.3V for example) to ‘LV’, and ground from the system to the ‘GND’ pin.
Dimensions: 0.63 x 0.52" (16.05 x 13.33mm)
Breadboard friendly! Can be used with normal serial, I2C, SPI, and any other digital signal. Note: Does not work with an analog signal.
Pins are labeled as Inputs and Outputs. These are relative to the board. A digital one going into the RXI pin on the 5V side will show up on the RXO pin on the 3.3V side as 3.3V. A digital one going into the TXI pin on the 3.3V side will show up on the TXO pin on the 5V side as 5V.
This revision of the Logic Level Converter fixes the issue with the board not stepping down from 5V to 3.3V correctly.