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SAMA5D27 Datasheet(PDF) 35 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) 35 Page - Microchip Technology

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In this configuration, the two following timing sequences are applied.
Figure 6-5. Power-On Sequence Timing Diagram
SYSTEM IN BACKUP
SYSTEM IS POWERED-UP
RESET IS RELEASED
VDDIN_3V3
MAIN 3.3V IS PRESENT
VDDBU
VDDBU ALWAYS PRESENT
VDDISC
VDDIN_3V3 LEVEL
VDDSDHC
VDDIN_3V3 LEVEL
INT_VDD
INTERNAL SUPPLIES GENERATION
SHDN
VDDBU LEVEL / SOFTWARE RELEASE
nRST
Tmain
Tstart
Tpor
b
c
d
e
a
f
Figure 6-6. 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
VDDIN_3V3 LEVEL
VDDSDHC
VDDIN_3V3 LEVEL
INT_VDD
INTERNAL SUPPLIES SWITCH-OFF
SOFTWARE IS RUNNING
SOFTWARE SHUTDOWN
SOFTWARE
SHDN
SOFTWARE REQUEST
nRST
Tsoft
Tmain_off
Tstop
c
d
a
b
Table 6-2. Timing Values
Symbol Description
Min.
Typ.
Max.
Unit
tmain(1)
Main 3.3V Start-up Time
–
–
1
ms
tstart
Internal Delay before starting System Core Supplies
1
–
3
ms
tpor
Power-on Reset Delay
–
10
11
ms
tsoft
Software Shutdown Time
Depending on system off time
ms
tmain_off Main 3.3V Power-off Time
–
–
1
ms
tstop
Internal Delay before switching-off System Core Supplies
1
–
3
ms
Note: 
1.
The three supplies VDDIN_3V3, VDDISC and VDDSDHC must be applied at the same time. If a delay is
implemented, it must be lower than tstart.
6.3
Power Supply Configuration #3
Some power inputs of the SAMA5D27 SOM1 are grouped and others are supplied by a separated power supplies.
• Backup domain is connected to a coin cell.
• Camera sensor power input (VDDISC) is connected to a separate power supply set at one of the following
voltage levels (1.8V/2.5V/2.8V/3.0V or 3.3V) depending on the camera sensor technology used in the
application.
• The remaining power inputs are connected to the main 3.3V supply.
SAMA5D27 SOM1
Power Supply Connections and Timing ...
© 2020 Microchip Technology Inc.
Datasheet
DS60001521D-page 35



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