I noticed the USB interface on the CC2540 USB dongle has some additional resistors and caps.
As shown in the enclosed diagram, I can see R21 and R31, along with C21 and C31, are standard for USB interface. But I also see R32, R92 and R91 connected to P1_0. I think these are used for some control purposes.
So if I just want to use standard USB interface, these R32, R91, R92 are not needed?