dude...i will mostly rely on the format of these chips do the IR communications between us.....so...take a look how the data send format...compare to the MIT ones....this one at least do use the MOrSE code...****...
Using the MCP2120 for Infrared Communications
http://www.microchip.com/download/appnote/infrared/00756a.pdf
Using the MCP2150 To Add IrDAŽ Standard Wireless Connectivity
http://www.microchip.com/download/appnote/infrared/00758a.pdf