Freescale provides some reference designs and commonly there are good start point for custom board development, for MKW2x devices there are two reference designs:
- TWR-KW2x, is the development tool for the Kinetis KW2x MCU devices, on a Tower System Module.
- USB-KW24D512, Packet sniffers are essential for wireless network development allowing over-the-air traffic monitoring.
You may find in the following links.
- USB
- TWR