Elektra CPU User Manual V1.00
Page 14
Input Power – J11
1 +5V
In
2 Ground
3 Key
(Cut)
4 +12V
In
5 Ground
6 +5V
In
7 -12V
In
8 -5V
In
9 ATX
Control
Table 3: J11 – Input Power Connector Pin out
Input power may be supplied either through J11 from an external supply or directly through the
PC/104 bus power pins if a PC/104 power supply is used with the CPU.
The board requires only +5VDC input power to operate. All other required voltages are generated
on board with miniature switching regulators. However since the PC/104 bus includes pins for
±
5V and
±
12V, these voltages may be supplied through J11 if needed. The +5V and +12V
voltages are controlled by the ATX power manager switches, while -5V and -12V are routed
directly to the corresponding pins on PC/104 bus and are not controlled by the ATX function.
Mu5V and Ground pins are provided for extra current carrying capacity if needed. Each pin
is rated at 3A max. For the CPU, the panel I/O board, and a video board, 3A is sufficient, so +5
and Ground require only a single wire each. In this case the first 4 pins may be connected to a
standard 4-pin miniature PC power connector if desired. For a larger PC/104 stack the total power
requirements should be calculated to determine whether additional wires are necessary.
ATX control enables the +5V and +12V power to be switched on and off with an external
momentary switch. A short press on the switch will turn on power, and holding the switch on for 4
seconds or longer will turn off power.
Diamond Systems’ cable no.
6981009
mates with J11. It provides 9 color-coded wires with
stripped and tinned leads for connection to user-supplied power sources. This cable may also be
used with Diamond Systems’ Jupiter-MM series power supplies in vehicle-based applications. In
this configuration, the input power is supplied to the Jupiter-MM board, and the Jupiter-MM output
power is connected to J11 on the CPU using cable 6981009. When used in this way, make sure
the two red +5V wires are both connected to the +5V output screw terminal on Jupiter-MM and
the Jupiter-MM is not plugged onto the PC/104 stack.
Deleted:
(Needs to be assessed for
increased current with Vega – also
loading must be derated – i.e. 3A
rating and 3A load is bad practice)¶
