Specifications

Chapter 3 Hardware
34 Reference Manual LittleBoard 800
Note: The shaded area denotes power or ground. The +12V and +3.3V on the Power Supply Input
connector (J19) are used for the PCI, ISA bus, and LVDS power, which are supplied externally
and not generated on the LittleBoard 800. The -5V and -12V used for the PC/104 bus are supplied
through the PC/104 bus or from an external power supply through the Utility 1 connector (J15).
ATX Power
Table 3-15 lists the pin signals for the J29 Power On Button and Reset Switch header, which uses 5 pins,
single row with 0.100" (2.54mm) pitch.
• Power On Switch – This control signal is provided externally through a button by connecting ground to
pin 1 on the J29 header.
• Reset Switch – This signal is provided externally through a switch by connecting ground to pin 3 on the
J29 header.
Table 3-16 lists the pin signals for the J30 Power On header, which uses 3 pins, single row with 0.100"
(2.54mm) pitch.
Table 3-14. Power Supply Input Pin/Signal Descriptions (J19)
Pin # Signal Description
1
+5V +5.0 Volts – This +5.0 volts DC +/- 5% is the only voltage required for operation.
2 GND Ground
3
GND Ground
4
+12V +12 Volts – This +12 volts is for the PC/104, PC/104-Plus, and LVDS power only.
5
+3.3V +3.3 Volts – This +3.3 volts is for PC/104-Plus Bus power only (optional).
6
GND Ground
7
+5V +5.0 Volts – This +5.0 volts DC +/- 5% is the only voltage required for operation.
Table 3-15. Power On Button and Reset Switch Header Pin/Signal Descriptions (J29)
Pin # Signal Description
1 PWRBTN Power On input (connect between pins 1 & 2)
2
GND Ground
3 RESET_IN Reset Switch input or output (connect between pins 2 & 3)
4NC NA
5
-12V VCC
Note: The shaded areas denote power or ground.
Table 3-16. Power On Header Pin/Signal Descriptions (J30)
Pin # Signal Description
1 PS_ON* Power Supply On – This signal is sent to the ATX power supply by the
LittleBoard 800 to turn On the ATX power supply. This signal can also be used
to turn Off the ATX power supply or go into a suspended or standby state.
2
GND Ground
3
VCCSB +5V suspend voltage (+5V, 100mA Standby) – This voltage is supplied from
ATX power supply. This voltage is required for normal operation.
Note: The shaded areas denote power or ground. The signals marked with * = Negative true
logic.