Octagon Systems XE-700, Справочное руководство

Страница: 25 / 123

Table 2–3 Power connector: J13
Pin Function Function Pin
1 nc nc 6
2 GND +5v 7
3 GND +5v 8
4 +12V –12V 9
5 nc GND 10
XE–700 SBC power supply requirements
The XE–700 SBC is designed to operate from a 5 VDC supply, connected at
J13. If you are using the PC/104 interface, you may also require
±
12 VDC. 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–700 SBC is listed in the
Technical Data appendix.
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 that has sufficient current
capacity, line and load regulation, hold up time, current limiting, and minimum
ripple.
It is extremely important to select a supply that ramps up in 10ms or less . This
assures that all the circuitry on the XE–700 SBC 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–
700 SBC. If the power supply does not drain below 0.7V, the CMOS components on
the XE–700 SBC will act like diodes and forward bias, potentially damaging the
XE–700 SBC circuitry.
The proper selection of a quality power supply and power supply cable ensures
reliability and proper functioning of the XE–700 SBC.
25