Connectors; Xplained Pro Standard Extension Headers - Microchip Technology ATmega4809 Xplained Pro Manual

(regulated) or 5.0V (USB/external voltage). The voltage is selectable using a jumper on the power selection header
J105.
An on-board power switch is used to turn power to the ATmega4809 ON and OFF. This power switch is controlled by
the EDBG. When the kit is powered up, the EDBG reads the ID chip information from all connected Xplained Pro
extension boards and checks that they are compatible with the voltage selected by the power selection header J105.
If the selected voltage is within the connected extensions ranges, the switch will open. If not, the EDBG power LED
will blink rapidly and the switch will stay closed resulting in no power provided to ATmega4809, the on-board
peripherals, and the connectors.
As ATmega4809 Xplained Pro can be powered by 5.0V, care must be taken not to connect any Xplained
CAUTION
Pro extensions that do not support this voltage, doing so may result in permanent damage. Check the
respective extension kit's user guide to see which voltages are acceptable.
Info: The EDBG reads the ID information from Xplained Pro extensions and controls the power switch
when the kit is powered up. This mechanism does not check hot-plugging of extension boards.
Figure 4-2. Power Supply Block Diagram
EDBG USB
External 5V input
Power source
Power switch/
Jumper/Header
Power converter
Power consumer
4.2

Connectors

4.2.1

Xplained Pro Standard Extension Headers

The Xplained Pro extension headers EXT1, EXT2, and EXT3 offer access to the I/O of the microcontroller to expand
the board, for example, by connecting extensions to the board. These headers are based on the standard Xplained
Pro extension header specification. The connections are shown in the table below. The headers have a pitch of 2.54
mm.
©
2020 Microchip Technology Inc.
Regulator 3.3V
Auto MUX
Regulator 3.3V
J105
Power Select
(Jumper)
P S
TARGET_VCC_ ENABLE
J207
JP
mikroBUS
J209
HD
User Guide
ATmega4809 Xplained Pro
EDBG
VCC_P3V3
Power Switch
P S
VCC_TARGET
J204
JP
Socket Peripherals
™
J208
HD
Hardware User Guide
J103
Jumper
VCC_MCU
ATmega4809
DS50002716C-page 12