Pin Number
Pin Name
Description
18
SPI_SCK
SPI clock pin. Always connected, bus type.
19
GND
Ground pin for extension boards.
20
VCC
Power pin for extension boards.
3.6.2
Xplained Pro Power Header
The power header can be used to connect external power to the SAM B11ZR Xplained Pro kit. The kit
automatically detects and switches to any external power if supplied. The power header can also be used
to supply power to external peripherals or extension boards. Ensure that the total current does not
exceed the recommended current limit of the on-board regulator when using the 3.3V pin.
Table 3-6. Xplained Pro Power Header
Pin Number
Pin Name
Description
1
VEXT_P5V0
External 5V input pin
2
GND
Ground pin
3
VCC_P5V0
Unregulated 5V pin (an output, derived from one of
the input sources)
4
VCC_P3V3
Regulated 3.3V pin (an output, used as main power
supply for the kit)
ATSAMB11ZR
©
2017 Microchip Technology Inc.
User Guide
DS70005334A-page 11
