Table of Contents
Advertisement
Chapter 3
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
1
+5V
2
GND
3
GND
4
+12V
5
+3.3V
6
GND
7
+5V
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
1
Fan_Tach
2
VCC
3
GND
Note: The shaded area denotes power or ground.
58
Description
+5.0 Volts – This +5.0 volts DC +/- 5% is the only voltage required for operation.
Ground
Ground
+12 Volts – This +12 volts is for the PC/104, PC/104-Plus, and LVDS power only
+3.3 Volts – This +3.3 volts is for PC/104-Plus Bus power only (optional)
Ground
+5.0 Volts – This +5.0 volts DC +/- 5% is the only voltage required for operation.
Description
Fan Tachometer – This signal indicates Fan speed
+5.0 volts DC +/- 5%
Ground
Reference Manual
Hardware
LittleBoard 800
Advertisement
Table of Contents
