The hardware manual for this chip says that the shield is made to interface with arduino, and that the shield standard is 3.3V. However, the arduino uno is a 5V device. The IOREF pin on the arduino is set to 5V, but the IOREF pin on this shield is connected to 3.3V. Is there a different arduino aside from the uno that has the R3 pinout form factor but runs at 3.3V? It seems like there will be problems using it with an uno at present.