I just used the 3.3V power supply since this chip does not require a 5V supply. I don't think Particle outputs a 5V line. I wanted to avoid an extra power regulator. The schematic is fairly straightforward from the datasheet:
I used split termination with two 60 ohm resistors.
I have not tested the board yet, as I am having a prototype built. Will keep you posted on the end result.