Modules transceiver

RFLink CC2500 RFLink CC2500
CC2500 = description = Mega
Pin 1 = (Ground) = Ground
Pin 2 = (VCC) = VCC (3.3 volt) Warning: Max 3.6 volt, do NOT connect to 5 volt!
Pin 3 = (MOSI) = MEGA Pin 51 Warning: Max 3.6 volt, do NOT connect to 5 volt I/O pin!
Pin 4 = (SCK) = MEGA Pin 52 Warning: Max 3.6 volt, do NOT connect to 5 volt I/O pin!
Pin 5 = (MISO) = MEGA Pin 50 Warning: Max 3.6 volt, do NOT connect to 5 volt I/O pin!
Pin 6 = (GDO2) = not connected
Pin 7 = (GDO0) = not connected
Pin 8 = (CS) = MEGA Pin 47 Warning: Max 3.6 volt, do NOT connect to 5 volt I/O pin!
Any Ground = MEGA PIN 6 (to unlock CC2500 software support, see the notes below!)
Antenna: This module has an onboard antenna, no additional antenna is needed.
You need a proper level shifter for the signal lines that have the warning note.

RFLink CC2500 RFLink CC2500
CC2500 = description = Mega
Pin 1 = (Ground) = Ground
Pin 2 = (VCC) = VCC (3.3 volt) Warning: Max 3.6 volt, do NOT connect to 5 volt!
Pin 3 = (MOSI) = MEGA Pin 51 Warning: Max 3.6 volt, do NOT connect to 5 volt I/O pin!
Pin 4 = (SCK) = MEGA Pin 52 Warning: Max 3.6 volt, do NOT connect to 5 volt I/O pin!
Pin 5 = (MISO) = MEGA Pin 50 Warning: Max 3.6 volt, do NOT connect to 5 volt I/O pin!
Pin 6 = (GDO2) = not connected
Pin 7 = (GDO0) = not connected
Pin 8 = (CS) = MEGA Pin 47 Warning: Max 3.6 volt, do NOT connect to 5 volt I/O pin!
Any Ground = MEGA PIN 6 (to unlock CC2500 software support, see the notes below!)
Antenna: This module has an onboard antenna, no additional antenna is needed.
You need a proper level shifter for the signal lines that have the warning note.

RFLink CC2500 RFLink CC2500
CC2500 = description = Mega
Pin 1 = (Ground) = Ground
Pin 2 = (CS) = MEGA Pin 47 Warning: Max 3.6 volt, do NOT connect to 5 volt I/O pin!
Pin 3 = (MISO) = MEGA Pin 50 Warning: Max 3.6 volt, do NOT connect to 5 volt I/O pin!
Pin 4 = (SCK) = MEGA Pin 52 Warning: Max 3.6 volt, do NOT connect to 5 volt I/O pin!
Pin 5 = (MOSI) = MEGA Pin 51 Warning: Max 3.6 volt, do NOT connect to 5 volt I/O pin!
Pin 6 = (VCC) = VCC (3.3 volt) Warning: Max 3.6 volt, do NOT connect to 5 volt!
Any Ground = MEGA PIN 6 (to unlock CC2500 software support, see the notes below!)
Antenna: Note that this module does not have an antenna. You need to connect one to the antenna pin!
Without antenna you will most likely not receive anything.
If you do not have an antenna, use a piece of wire. The length of this wire should be between 26 and 32 millimeters.
You need a proper level shifter for the signal lines that have the warning note.

Note about the partially double use of connections/pins:
Indeed the CC2500 and NRF modules use partially the same pins, this is not a mistake but a feature!
Because of that we can talk to multiple modules.