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36
ATSAM4C-EK [USER GUIDE]
11251A–ATARM–16-Dec-13
To measure the current consumption on VDDBU when in backup mode, JP9 (Shutdown control) must be opened and an
ammeter connected on JP8 (VDDBU) as described in the following procedure:
1.
Power off the board using SW1
2.
Insert the 3V lithium battery provided in the battery holder
3.
Place an ammeter (with sufficient capacity to measure current lower than 1µA) on JP8
4.
Power on the board using SW1
5.
(
optional
) Set the RTC as described above
6.
Press the push button BP5 (SCROLL-DOWN) to place the board in low-power mode
Before shutdown, the following messages are displayed on the LCD:
“ENTERING BACKUP MODE”
“PRESS FWUP BP1 TO WAKE UP”
“USE BP3 TO GENERATE TAMPER EVENTS”
Blinking “BYE”
At this point, the current consumption on the ammeter should be less than 1µA @ 25°C @ 3V.
Once in backup mode, the Anti-tamper pin 0 (TMP0) is enabled. BP3 (TMP0) push button can be used to generate
tamper events before waking up the board. Tamper events are registered without waking up the board. Up to 15 tamper
events can be registered. To wake up the board, press BP1 (FWUP). Upon start-up, the number of tamper events and
time-stamping of the tamper events are displayed on the LCD.
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