26
Table 2–3 Power connector: J8
Pin Function Function Pin
1
nc
nc
6
2
GND
+5v
7
3
GND
+5v
8
4
+12V
–12V
9
5
+3V
GND
10
XE
–900 SBC power supply requirements
The XE–900 SBC is designed to operate from a 5 VDC supply, connected at
J8. If you are using the PC/104 or PC/104
-Plus
interface, you may also require
±
12
VDC and/or +3V. The connector is a 10-pin ATX PC power supply connector, and
connects to a 10-pin ATX power supply, or with an adapter cable, to a standard 20-
pin ATX power supply. The typical current requirement for the XE–900 SBC is
listed in the
Technical Data
appendix. For the XE–900 SBC the power supply must
be able to meet the 10A inrush current.
The user should consider factors such as the power cable conductor gauge, number
and length of conductors, mating connectors, and the power requirements of
external devices such as hard drives, floppy drives, displays, mouse, and keyboard.
It is important that a quality power supply be used with the XE–900 SBC that has
sufficient current capacity, line and load regulation, hold up time, current limiting,
and minimum ripple. The power supply for the XE–900 must meet the startup
risetime requirements specified in the ATX Power Design Guide, version 1.1,
section 3.3.5. This assures that all the circuitry on the CPU control card sequences
properly and avoids system lockup.
Also, select a power supply that discharges quickly. If large power supply output
capacitors are used, powering the system down and then up may lock up the XE–
900 SBC. If the power supply does not drain below 0.7V, the CMOS components on
the XE–900 SBC will act like diodes and forward bias, potentially damaging the
XE–900 SBC circuitry.
The proper selection of a quality power supply ensures reliability and proper
functioning of the XE–900 SBC.
Содержание XE-900
Страница 19: ...19 Figure 2 1 XE 900 SBC component diagram top ...
Страница 20: ...20 Figure 2 2 XE 900 SBC component diagram bottom ...
Страница 21: ...21 Figure 2 3 XE 900 SBC dimensions without Integrated Conductive Cooling System ...
Страница 38: ...38 ...
Страница 91: ...91 Figure 15 2 Dimensions for the Integrated Conductive Cooling System ...