Microchip Technology ATmega4809 Xplained Pro Manual page 26

Figure 6-1. Power Supply - Kit Revision 5, 4, and 3
EDBG USB
External 5V input
Power source
Power switch
Power converter
Power consumer
Work Around
Bypassing the power switch shown in the block diagram above will prevent the power-up problems. The work around
is to short-circuit J105 pin 2 and J103 pin 2, as shown in the image below.
This work around removes the Xplained Pro extension overvoltage protection feature. Make sure that the
WARNING
electrical specifications of the connected Xplained Pro extensions match the voltage configuration of the
ATmega4809 Xplained Pro (e.g., do not connect an Xplained Pro extension that does not support 5V to an
ATmega4809 Xplained Pro in a 5V configuration).
Figure 6-2. Power Supply Work Around
Revision 5 of ATmega4809 Xplained Pro already implements this hotfix.
Affected Kit Revisions
This design flaw affects revision 3, 4, and 5 of ATmega4809 Xplained Pro.
©
2020 Microchip Technology Inc.
Hardware Revision History and Known Issues
Regulator 3.3V
Auto MUX
Regulator 3.3V
Power Select
(Jumper)
J105
mikroBUS
™
User Guide
ATmega4809 Xplained Pro
EDBG
VCC_P3V3
Power Switch
VCC_TARGET
Socket Peripherals
Jumper
VCC_MCU
ATmega4809
DS50002716C-page 26