EBC-C413/Configuration
v1.2
www.winsystems.com
Page 24
WINSYSTEMS cable CBL-236-G-2-1.5 simplifies this connection to the
board.
7.12.2 ATXAUX - ATX/Auxiliary Power Connector
Connect to the ATX signals for the power button, 5 V standby, and power
good through this connector.
The EBC-C413 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-C413 power circuit detects 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,
connect a power switch (momentary contact) between pin 2 (power
button) and pin 1 (ground) of ATXAUX. The +5 VSB signal provides the
standby voltage to the EBC-C413, but does not power any other features
of the board. When the power button is pressed, the EBC-C413 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. Because this is software driven, it is possible that a software lockup
could prevent the power button from functioning properly. The EBC-C413
detects an ATX power supply, if +5 VSB is present at startup.
Layout and Pin Reference
Additional Information
This connection is a Molex 22-11-2042 (or equivalent).
Pin
Name
Description
1
GND
Ground
2
FRT_PWRON# (PWRBTN)
Power button
3
+5VSB
+5 V Standby Input
4
ATX_PSON# (PSON)
Momentary contact (normally open)
1
