User's Manual

32
AVR2043
8345A-AVR-11/10
9 Table of contents
Features............................................................................................... 1
1 Introduction ...................................................................................... 1
2 Disclaimer......................................................................................... 2
3 Overview........................................................................................... 2
4 Functional description..................................................................... 3
4.1 Interface connector specification......................................................................... 3
4.1.1 ATmega1281 configuration ....................................................................................... 4
4.1.2 ATmega644 configuration ......................................................................................... 4
4.2 ID EEPROM ........................................................................................................ 5
4.3 Supply current sensing........................................................................................ 6
4.4 Radio transceiver reference clock ....................................................................... 7
4.5 RF section ........................................................................................................... 8
5 PCB Layout Description.................................................................. 9
5.1 PCB detail 1 – balanced RF pin fan out ............................................................ 10
5.2 PCB detail 2 – RF switch................................................................................... 11
5.3 PCB detail 3 – crystal routing ............................................................................ 11
5.4 PCB – analog GND routing ............................................................................... 13
5.5 PCB – digital GND routing................................................................................. 14
5.6 PCB – GND plane ............................................................................................. 14
5.7 Ceramic antenna ............................................................................................... 14
5.7.1 Antenna design study .............................................................................................. 14
5.7.2 Antenna design-in ................................................................................................... 17
5.7.3 Antenna tuning ........................................................................................................ 18
6 Mechanical description ................................................................. 23
7 Electrical characteristics............................................................... 24
7.1 Absolute maximum ratings ................................................................................ 24
7.2 Recommended operating range........................................................................ 24
7.3 Current consumption ......................................................................................... 24
8 Abbreviations ................................................................................. 25
A.1 Schematic..................................................................................................... 26
A.2 Assembly drawing ........................................................................................ 27
A.3 Bill of materials ............................................................................................. 28
A.4 – Radio certification .......................................................................................... 29
References......................................................................................... 30
EVALUATION BOARD/KIT IMPORTANT NOTICE ........................... 31
9 Table of contents ........................................................................... 32