110113 PRODUCT MANUAL EBC-Z5xx 20
LEDs located at D14 (+5 VSB Power LED), D15 (+5V Power LED) indicate the state of the system.
NOTE: D14 and D15 will always be illuminated during normal operation. When using an ATX power supply and only D14
is illuminated, the system is in suspend mode.
D14 (+5 VSB Power LED), D15 (+5V Power LED)
Visual
Index
The EBC-Z5xx supports either AT (standard power supply) or ATX type power supplies. Zero load supplies are
recommended. J28 species the style of supply connected to the single board computer (SBC). 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.
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, J28 should be set accordingly and a power button (momentary contact) connected between pin 3
(power button) and pin 4 (ground) of J24. The +5 VSB signal provides the standby voltage to the EBC-Z5xx but does not
power any other features of the board. When the power button is pressed, the EBC-Z5xx 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. For the BIOS to
report the ATX supply to ACPI-compatible operating systems, J28 must be setup correctly.
J28 - Power Supply Selection
Visual
Index
D14 GREEN +5VSB
D15 RED VCC (+5V)
AT Power 1-2, 3-4, 5-6, 7-8 (default)
ATX Power 1 2, 3 4, 5 6, 7 8
□ □
□ □
□ □
□ □
2
4
6
8
J28
1
3
5
7