So, i can't see under the chip for what pin goes where and I'm not at home to test points...but it appears as though they are using multiple pins...granted, three of them would have to be devoted to push pin. it does look like the pins are devoted to the blatantly obvious components. Unless they are treating the din pin as both input and output. (possible?) if it is an input then the current draw check would be logical from there. anyway...It would be cool to pull current draw. 
the rf version has dual grounds...I should look at that closer again and see if that second ground goes elsewhere. on the small adapter it has a large ground connection so maybe that is going to a resistor on one of the input pins. Great idea to check! I did post the images for both boards...but a better image is of the small one (which is the one mostly in question) it does have three resistors