User's Manual

12
AVR2044
8339A-AVR-09/10
EXT1
Pin# RCB128RFA1
Function
1281V RCB
Function
Pin# RCB128RFA1
Function
1281V RCB
Function
1 PB1 PB1 (SCK) 2 GND GND
3 PE7 PE7 4 PE6 PE6
5 TST
(connect for
parallel
programming
only)
PE5 6 RSTON PE4
7 PE3 PE3 8 PE2 PE2
9 PE1 PE1 (PDO) 10 PE0 PE0 (PDI)
11 GND AGND 12 AREF AREF
13 PF0 PF0 14 PF1 PF1
15 PF2 PF2 16 PF3 PF3
17 PF4 PF4 (TCK) 18 PF5 PF5 (TMS)
19 PF6 PF6 (TDO) 20 PF7 PF7 (TDI)
21 V_RCB V_RCB 22 GND GND
23 PB0 PA0 24 PB1 PA1
25 PB2 PA2 26 PB3 PA3
27 PB4 PA4 28 PB5 PA5
29 PB6 PA6 30 PB7 PA7
The connector pin out mapping enables operation with almost all peripheral elements
on existing base boards, except external SRAM support.
5.7 PCB Layout Description
This section discusses critical layout details, important for derived PCB designs. A
derived design should carefully consider the following details:
• Establish a solid ground plane for the antenna. The PCB area has to be
considered as a counterpart of the antenna. The PCB interacts with the radiated
electromagnetic wave.
• Isolate digital noise from the antenna and the RF and analog radio transceiver
sections to ensure maximum possible radio transceiver performance.
• Isolate digital noise from the reference crystal to ensure maximum possible
transmit signal purity and receiver performance, especially operating high data
rate ISM modes.
• Reduce any kind of spurious emissions well below the limits set by the individual
regulatory organizations.
The RCB128RFA1 demonstrates a low cost, 2-layer PCB design. Performance is
achieved without using additional inner ground and supply planes.
Layout details 1 to 9 as shown in Figure 5-4 and Figure 5-5 are described particularly
in the following sub-sections.