User's Manual

Atmel AVR2080
25
8479A-AVR-01/12
9 Table of contents
1 Introduction ...................................................................................... 1
2 Disclaimer......................................................................................... 2
3 Overview........................................................................................... 2
4 Functional description..................................................................... 3
4.1 Interface connector specification......................................................................... 3
4.1.1 REB-CBB (Atmel ATxmega256A3) and Atmel STK501 (Atmel ATxmega1281)
configuration....................................................................................................................... 4
4.1.2 Atmel ATmega644 configuration ............................................................................... 4
4.2 ID EEPROM ........................................................................................................ 5
4.3 Supply current sensing........................................................................................ 7
4.4 Radio transceiver reference clock ....................................................................... 7
4.5 RF section ........................................................................................................... 8
5 PCB layout description
................................................................. 10
5.1 PCB detail 1 – balanced RF pin fan out ............................................................ 11
5.2 PCB detail 2 – crystal routing ............................................................................ 11
5.3 PCB – analog GND routing ............................................................................... 12
5.4 PCB – digital GND routing................................................................................. 13
5.5 PCB – GND plane ............................................................................................. 13
5.6 Ceramic antenna design and tuning ................................................................. 13
6 Mechanical description ................................................................. 14
7 Electrical characteristics............................................................... 15
7.1 Absolute maximum ratings ................................................................................ 15
7.2 Recommended operating range........................................................................ 15
7.3 Current consumption ......................................................................................... 15
7.4 Transmitter characteristics ................................................................................ 16
7.5 Receiver characteristics .................................................................................... 16
8 Abbreviations
................................................................................. 17
Appendix A – PCB design data........................................................ 18
A.1 Schematic..................................................................................................... 18
A.2 Assembly drawing ........................................................................................ 19
A.3 Bill of materials ............................................................................................. 20
Appendix B – Radio certification..................................................... 21
B.1 United States (FCC) ..................................................................................... 21
B.2 Europe .......................................................................................................... 22
References......................................................................................... 23