Kontron COMe Starterkit Eval T2 - Manual (Page 164)

Power and Reset
3.4. Reference Schematics
3.4.1. ATX Power Supply
ATX power supplies are used in millions of desktop PCs and are often used in OEM equipment
as well. They are inexpensive and are readily available. An ATX power supply provides more
power rails (two separate +12V rails, +5V, +3.3V, -12V and +5V Suspend) than are required by a
COM Express Module, but often the Carrier Board and other system components make use of
the additional rails.
The following figure shows the ATX power Carrier Board circuitry using a 24 pin ATX main power
connector. For systems with power-hungry CPUs or Graphics Cards, two additional +12V power
pins may be implemented using an auxiliary 4 pin (2x2) +12V/GND power connector.
PICMG ® COM Express ® Carrier Board Design Guide Rev. 2.0 / December 6, 2013
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