All the native GPIO pins on the XU4 operate at 1.8V. However, many devices support only 3.3V or 5V.
This level shifter board contains 3 x TSX0108E bi-directional level shifter ICs. The 30-pin and 12-pin GPIO ports on the XU4 are converted to the more common 0.1inch (2.54mm) pitch 40-pin header. All the signals can be level shifted to 3.3V or 5V. You can choose the voltage with a small hardware slide switch on the board.
The 40-pin header pin map is compatible with the ODROID-C1 and Raspberry Pi/Pi 2.
We are working on the WiringPi compatible libraries to simplify development.
* The XU3/XU3-Lite requires modification or removal of the 12-pin socket on the XU4 Shifter Shield