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SAMA5D27 Datasheet(PDF) 37 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) 37 Page - Microchip Technology

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Symbol Description
Min.
Typ.
Max.
Unit
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 (From regulator available on the
motherboard)
–
–
1
ms
toff1
VDDISC 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.
The supplies VDDIN_3V3 and VDDSDHC must be applied at the same time. If a delay is implemented, it must
be lower than tstart.
6.4
Power Supply Configuration #4
Each power input of the SAMA5D27 SOM1 is supplied by separate 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.
• SD Card power input (VDDSDHC) is connected to a separate power supply set at one of the following voltage
levels (1.8V or 3.3V) depending on the SD Card Technology/Speed used in the application.
• VDDIN_3V3 power input is connected to the main 3.3V supply.
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
• VDDSDHC Power Rail as reference
– PA0 to PA10
• All other PIOs have VDDIN_3V3 Power Rail as reference.
Figure 6-10. Power Configuration #4
SHDN
nRST
VDDSDHC
VDDISC
VDDBU
VDDIN_3V3
nRST
SHDN
3.3V
SDMMC0_VDDSEL
SAMA5D27 SOM1
Power Supply Connections and Timing ...
© 2020 Microchip Technology Inc.
Datasheet
DS60001521D-page 37



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