Specifications

Chapter 3 Hardware
58 Reference Manual LittleBoard 800
Power Interfaces
Power Supply Input (J19)
The LittleBoard 800 uses five separate voltages on the board, but only one of the voltages is provided
externally (+5 volts) through the external connector, which uses a 7-pin vertical header with 0.156”
(3.96mm) spacing. Holes for a right angle mounting header are also available at J19. All the onboard
voltages are derived from the externally supplied +5 volts DC +/- 5%. The onboard voltages include the
CPU core voltages as well as the other voltages used on the board.
Table 3-25 lists the pin-outs and signals for Power supply input and it has 7 pins, single row, with 0.156"
pin spacing..
Table 3-25. 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.
Notes: 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 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 (J16).
Optional CPU Fan (J21)
Table 3-26 lists the pin-outs and signals of the optional CPU Fan and it has 3 pins, single row, with
0.100" pin spacing.
Table 3-26. Optional CPU Fan (J21)
Pin # Signal Description
1 Fan_Tach Fan Tachometer – This signal indicates Fan speed
2 VCC +5.0 volts DC +/- 5%
3 GND Ground
Note: The shaded area denotes power or ground.