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Chapter 2 Hardware Installation
24
Chapter 2
Use a power supply that complies with the ATX12V Power Supply Design Guide Version 1.1.
An ATX12V power supply unit has a standard 24-pin ATX main power connector that must be
inserted into the 24-pin connector. The 4-pin +12V power connector enables the delivery of
more +12VDC current to the COM express module board and carrier board’s PCIe device.
The power connectors from the power supply unit are designed to fit the 24-pin and 4-pin
connectors in only one orientation. Make sure to find the proper orientation before plugging
the connectors.
Power Connectors
1
ON
2 3 4
1 3
2 4
Ground
Ground
+12V
+12V
Important:
The system board consumes a minimal amount of power. Due to its low power
consumption, you only need a 120W to 150W power supply. Every power supply has
its minimum load of power. If you use a greater than 150W power supply, the power
consumed by the system board may not attain its minimum load causing instability to
the entire system.
13
12 24
1
+3.3VDC
+3.3VDC
+5VDC
PWR_OK
+5VSB
+12VDC
+12VDC
+3.3VDC
+3.3VDC
-12VDC
PS_ON#
GND
GND
NC
+5VDC
+5VDC
+5VDC
GND
GND
GND
GND
GND
+5VDC
GND
1
ON
2 3 4
Battery
The lithium ion battery (CR2032 coin cell) powers the real-time clock and CMOS memory. It is
an auxiliary source of power when the main power is shut off.
Safety Measures
• Danger of explosion if battery incorrectly replaced.
• Replace only with the same or equivalent type recommended by the manufacturer.
• Dispose of used batteries according to local ordinance
.
Connect to the
battery connector
Battery
Battery
Connector
1
+3.3V
GND
2
