Power Header - Atmel ATMEGA256RFR2 Xplained Pro User Manual

Table 3-4. Xplained Pro extension header
Pin number Name
1 ID
2 GND
3 ADC(+)
4 ADC(-)
5 GPIO1
6 GPIO2
7 PWM(+)
8 PWM(-)
9 IRQ/GPIO
10 SPI_SS_B/GPIO
11 TWI_SDA
12 TWI_SCL
13 USART_RX
14 USART_TX
15 SPI_SS_A
16 SPI_MOSI
17 SPI_MISO
18 SPI_SCK
19 GND
20 VCC
3.4.2

Power header

The power header can be used to connect external power to the ATMEGA256RFR2 Xplained Pro kit. The
kit will automatically detect and switch to the external power if supplied. The power header can also be used
as supply for external peripherals or extension boards. Care must be taken not to exceed the total current
limitation of the on-board regulator for the 3.3V regulated output. To locate the current measurement header,
please refer to Figure 1-1, "ATMEGA256RFR2 Xplained Pro evaluation kit overview."
Table 3-5. Power header PWR
Pin number PWR header
1
2
3
4
Note If the board is powered from a battery source it is recommended to use the PWR header. If there
is a power source connected to EDBG USB, the EDBG is activated and it will consume more
power.
Description
Communication line to the ID chip on extension board.
Ground
Analog to digital converter , alternatively positive part of differential
ADC
Analog to digital converter , alternatively negative part of
differential ADC
General purpose IO
General purpose IO
Pulse width modulation , alternatively positive part of differential
PWM
Pulse width modulation , alternatively positive part of differential
PWM
Interrupt request line and/or general purpose IO.
Slave select for SPI and/or general purpose IO.
Data line for two wire interface. Always implemented, bus type.
Clock line for two wire interface. Always implemented, bus type.
Receiver line of Universal Synchronous and Asynchronous serial
Receiver and Transmitter
Transmitter line of Universal Synchronous and Asynchronous
serial Receiver and Transmitter
Slave select for SPI. Should be unique if possible.
Master out slave in line of Serial peripheral interface. Always
implemented, bus type
Master in slave out line of Serial peripheral interface. Always
implemented, bus type
Clock for Serial peripheral interface. Always implemented, bus
type
Ground
Power for extension board
Pin name
VEXT_P5V0
GND
VCC_P5V0
VCC_P3V3
Atmel ATMEGA256RFR2 Xplained Pro [USER GUIDE]
Description
External 5V input
Ground
Unregulated 5V (output, derived
from one of the input sources)
Regulated 3.3V (output, used as
main power for the kit)
42079C-MCU-05/2013
8