2.3
External power
A mains supply in the range 100-240V AC powers the N1 SDP.
This section contains the following subsections:
•
2.3.1 Overview of power scheme
•
2.3.1
Overview of power scheme
A standard ATX power supply unit converts the mains power to low DC voltages which power the N1
board. On-board regulators supply power to the N1 board and to the power domains of the N1 SoC.
Power LEDs indicate the active power domains. See
2.11 LEDs, switches, and buttons
information on the power LEDs.
2.3.2
Power islands
The N1 board has the following power islands:
• ATX Always-On region:
— Operates in standby state.
— Powers the
Motherboard Configuration Controller
(MCC) and
Platform Controller Chip
(PCC)
subsystems only.
• Switched region:
— Main board VIO and all other non-MCC and non-PCC supplies, including the IOFPGA.
This arrangement enables the PCC to receive a request to place the board into standby state over its local
Ethernet connection. The following figure shows the N1 board power islands.
N1 board
IOFPGA
N1 SoC
Switched power domains
Switched
PSUs
MCC
PCC
SPI
Always-On power domain SB_3V3
5VSB to
3V3
ATX
I
2
C
UART
SMB
5VSB
ATXON
Low-voltage DC
ATX outputs
TLX-400
SCC
UART
SCC
Figure 2-3 N1 board power islands
2 Hardware description
2.3 External power
101489_0000_02_en
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