J100 pin Signal name
Description
4
VCC_BOARD
ATmega32U4 V
CC
(J301 pin 2)
5
TMS
6
RESET
Connected to ATmega32U4 only
7
NC
8
NC
9
TDI
10
GND
4.6
Extension Header Area
The marked area on the grid I7 to R8 can be used for strapping in an Xplained Pro extension header or a
10-pin legacy Xplained/RZ600 header.
Figure 4-6. Extension Header Area
The SPI bus signals are available close to the header at row J and K, enabling easy connection to header
pin 15 to 18.
Using pin 11 to 20 enables connection of the 10-pin legacy header used on the RZ600 wireless modules
and the 10-pin Xplained sensor modules.
The general bus connections for an Xplained Pro Extension board are indicated in the table below.
Detailed wiring can be found in the selected extension board documentation.
Table 4-9. Extension Header Typical Signals
Pin
Signal name
Signal description
1
ID
Communication line to the ID chip on the Xplained extension board
2
GND
Ground
3
ADC(+)
Analog to digital converter, alternatively positive part of differential ADC
4
ADC(-)
Analog to digital converter, alternatively negative part of differential ADC
5
GPIO1
General purpose I/O
ATmega168PB Xplained Mini
©
2017 Microchip Technology Inc.
User Guide
DS50002636A-page 22
