– When inserting the USB cable (J7) or the DC jack (J1), the system starts up on its own without any action
on the nSTART button. See event "1" in the diagram below.
• The backup battery is partially or fully charged.
– The backup battery is charged above the value of V
threshold
.
– When inserting the USB cable (J7) or DC jack (J1), the system does not start automatically and a short
action on the nSTART button is necessary to start the system. See event "2" in the diagram below.
Figure 4-2. Start-Up Behavior Diagram
_
Notes:
1.
The system can be powered off by a long pressure (> 4 seconds) on the nSTART button.
2.
It is possible to setup an automatic startup at each power insertion by mounting a C240 capacitor. With this
configuration, the system starts automatically when the USB cable (J7) or the DC jack (J1) is connected. This
is not the factory configuration.
SAMA7G54-EK
Installation and Operation
©
2022 Microchip Technology Inc.
and its subsidiaries
User Guide
DS50003273A-page 68
