SAMA5D27 datasheet(36/55 Pages) MICROCHIP

36 / 55 page

In this configuration, the following PIOs have:

• VDDBU Power Rail as reference

– COMPP and COMPN

– PIOBU1 to PIOBU7

– RXD, SHDN and WKUP

• VDDISC Power Rail as reference

– PC9 to PC25

• All other PIOs have VDDIN_3V3 Power Rail as reference.

Figure 6-7. Power Configuration #3

SHDN

nRST

VDDSDHC

VDDISC

VDDBU

VDDIN_3V3

nRST

SHDN

3.3V

In this configuration mode, the two following timing sequences are applied.

Figure 6-8. Power-On Sequence Timing Diagram

SYSTEM IN BACKUP

WAKE UP

SYSTEM IS POWERED-UP

RESET IS RELEASED

VDDIN_3V3

MAIN 3.3V IS PRESENT

VDDBU

VDDBU ALWAYS PRESENT

VDDISC

EXTERNAL VDDISC LEVEL (1.8V/2.5V/2.8V/3.0V/3.3V)

VDDSDHC

VDDIN_3V3 LEVEL

INT_VDD

INTERNAL SUPPLIES GENERATION

SHDN

VDDBU LEVEL / SOFTWARE RELEASE

nRST

Tmain

Ton1

Tstart

Tpor

Figure 6-9. Power-Off Sequence Timing Diagram

SYSTEM IS ON

POWER-OFF PROCEDURE

SYSTEM IS POWER-DOWN

SYSTEM IN BACKUP

VDDIN_3V3

MAIN 3.3V IS PRESENT

VDDBU

VDDBU ALWAYS PRESENT

VDDISC

EXTERNAL VDDISC LEVEL (1.8V/2.5V/2.8V/3.0V/3.3V)

VDDSDHC

VDDIN_3V3 LEVEL

INT_VDD

INTERNAL SUPPLIES SWITCH-OFF

SOFTWARE IS RUNNING

SOFTWARE SHUTDOWN

SOFTWARE

SHDN

SOFTWARE REQUEST

nRST

Tsoft

Tmain_off

Toff1

Tstop

Table 6-3. Timing Values

Symbol Description

Min.

Typ.

Max.

Unit

tmain(1) Main 3.3V Start-up Time (From regulator available on the

motherboard)

–

ton1

VDDISC Regulator Start-up Time (From regulator available on the

motherboard)

–

800

µs

tstart

Internal Delay before starting System Core Supplies

–

SAMA5D27 SOM1

Power Supply Connections and Timing ...

Datasheet

DS60001521D-page 36

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