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SAMA5D27 Datasheet(PDF) 36 Page - Microchip Technology

Part # SAMA5D27
Description  SAMA5D27 MPU, 1Gbit (128MB) DDR2 SDRAM, 10/100 Ethernet PHY, 64Mbit (8MB) Flash, Power Management IC, 1Kbit EEPROM
PDF  55 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

SAMA5D27 Datasheet(HTML) 36 Page - Microchip Technology

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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
b
a
d
c
e
f
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
c
d
e
a
b
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)
–
–
1
ms
ton1
VDDISC Regulator Start-up Time (From regulator available on the
motherboard)
–
–
800
µs
tstart
Internal Delay before starting System Core Supplies
1
–
3
ms
SAMA5D27 SOM1
Power Supply Connections and Timing ...
© 2020 Microchip Technology Inc.
Datasheet
DS60001521D-page 36



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