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J3 - ATX Signals
ATX signals for the power button, reset and power good are provided at
J3
. WinSystems offers the cable
PCB Connector:
MOLEX 22-11-2042 (J3)
Mating Connector:
MOLEX 22-01-2045 (Housing)
MOLEX 08-55-0110 or 08-55-0111 (Crimp)
J3
PSON_OUT
+5VSB_PWR
PWR_BTN
GND
□
□
□
□
1
2
3
4
The EBC-C384 supports either AT (standard power supply) or ATX type power supplies. Zero load supplies are
recommended. An AT power supply is a simple on/off supply with no interaction with the single board computer. Most
embedded systems use this type of power supply and it is the default setting. The EBC-C384 power circuit will detect an
AT power supply if +5 VSB is not present at startup.
ATX type power supplies function with a “soft” on/off power button and a +5 VSB (standby). If an ATX compatible power
supply is connected, a power button (momentary contact) connected between pin 3 (power button) and pin 4 (ground)
of
J3
. The +5 VSB signal provides the standby voltage to the EBC-C384, but does not power any other features of the
board. When the power button is pressed, the EBC-C384 pulls PSON (Power Supply On) low and the power supply turns
on all voltages to the single board computer. When the power button is pressed again, the BIOS signals the event so
ACPI-compliant operating systems can be shutdown before the power is turned off. In ATX mode, if the power button is
held for 4 seconds, the power supply is forced off, regardless of ACPI. Since this is software driven, it is possible that
a software lockup could prevent the power button from functioning properly. The EBC-C384 will detect an ATX power
supply, if +5 VSB is present at startup.