ATSAMA5D41A-CU View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'ATSAMA5D41A-CU' PDF : 1808 Pages View PDF
4.2 Powerup Considerations
VDDBU must be set first and for a permanent duration.
The user must maintain NRST at ‘L’ prior to switching on the power supplies. Then VDDIOP and VDDANA are to
be switched on, followed by VDDCORE. Afterward, other power supplies can be switched on. After a delay of five
SLCK periods, the user can assert NRST to ‘H’ and make the system start.
Figure 4-1 illustrates the SAMA5D4 powerup sequence.
Figure 4-1. Recommended Powerup Sequence
VDDBU
VDDIOP0
VDDIOP1
VDDANA
VDDCORE
VDDOSC
VDDIOM
VDDUTMII
VDDIODDR
VDDFUSE
NRST
5 x tSLCK
time
4.3 Shut-down Considerations
When the SHDN pin is asserted, NRST must be maintained at ‘L’ prior to switching off the power supplies. After a
delay of five SLCK periods, VDDPLL, then VDDCORE, then VDDIOP and VDDANA can be switched off.
Afterward, other power supplies can be switched off.
VDDBU must never be switched off when other supplies are on.
4.4 Wakeup Considerations
When SHDN is rising, NRST is to be maintained at ‘L’ prior to switching on the power supplies. Then VDDIOP and
VDDANA are to be switched on, followed by VDDCORE and VDDPLL. Afterward, other power supplies can be
switched on. After a delay of five SLCK periods, the user can assert NRST to ‘H’ and make the system wakeup.
SAMA5D4 Series [DATASHEET]
29
Atmel-11238C-ATARM-SAMA5D4-Datasheet_12-Jul-16
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