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SAMA5D27 Datasheet(PDF) 38 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) 38 Page - Microchip Technology

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In this configuration mode, the two following timing sequences are applied.
Figure 6-11. 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
DYNAMIC VDDSDHC LEVEL (3.3V)
DYNAMIC VDDSDHC LEVEL (1.8V)
SDMMC0_VDDSEL
INT_VDD
INTERNAL SUPPLIES GENERATION
SHDN
VDDBU LEVEL / SOFTWARE RELEASE
nRST
Tmain
Ton2
Ton1
Tstart
Tpor
Tsys
b
d
c
g
e
a
f
Figure 6-12. 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
VDDSDHC LEVEL (1.8V)
VDDSDHC LEVEL (3.3V)
SDMMC0_VDDSEL
INT_VDD
INTERNAL SUPPLIES SWITCH-OFF
SOFTWARE IS RUNNING
SOFTWARE SHUTDOWN
SOFTWARE
SHDN
SOFTWARE REQUEST
nRST
Tsoft
Tmain_off
Toff1
Toff2
Tstop
c
d
e
f
a
b
Table 6-4. Timing Values
Symbol
Description
Min.
Typ.
Max.
Unit
tmain
Main 3.3V Start-up Time (From regulator available on
the mother board)
–
–
1
ms
ton1
VDDISC Regulator Start-up Time (From regulator
available on the mother board)
–
–
800
µs
ton2
VDDSDHC Regulator Start-up Time (From regulator
available on the mother board)
–
–
800
µs
tstart
Internal Delay before starting System Core Supplies
1
–
3
ms
tpor
Power-on Reset Delay
–
10
11
ms
tsys
Low-speed to High-speed Card Timing(1)
Depending on system on
time
ms
tsoft
Software Shutdown Time
Depending on system off
time
ms
tmain_off
Main 3.3V Power-off Time (From regulator available
on the motherboard)
–
–
1
ms
toff1
VDDISC Regulator Power-off Time (From regulator
available on the motherboard)
–
–
1
ms
toff2
VDDSDHC Regulator Power-off Time (From regulator
available on the motherboard)
–
–
1
ms
tstop
Internal Delay before switching off System Core
Supplies
1
–
3
ms
Note: 
1.
Timing depends on the system boot time. No particular recommendations to apply.
SAMA5D27 SOM1
Power Supply Connections and Timing ...
© 2020 Microchip Technology Inc.
Datasheet
DS60001521D-page 38



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