Chapter 3
Hardware
LittleBoard 735
Reference Manual
35
Note:
The shaded areas denote power or ground. The +12V and +3.3V on the Power Supply Input
header (J19) are used for the PCI, ISA bus, and LVDS power, which are supplied externally and
not generated on the LittleBoard 735. 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 header (J15).
ATX Power Interface
Table 3-18
lists the pin signals for the J30 Power-On header, which uses 3 pins, single row with 0.100"
(2.54mm) pitch.
Note:
The shaded areas denote power or ground. The signals marked with * = Negative true logic.
Power-On Button Interface
A Power-On Button signal is provided by connecting ground to pin-1 on this header (J46). A Reset Switch
signal is provided by connecting ground to pin 3 on this header.
Table 3-19
lists the pin signals for the J46 Power On Button header, which uses 5 pins, single row with
0.100" (2.54mm) pitch.
Note:
The shaded area denotes power or ground.
Table 3-18. ATX Power Header Pin Signals (J30)
Pin #
Signal
Description
1
PS_ON*
Power Supply On – This signal is sent to the ATX power supply by the
LittleBoard 735 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
VCC5_AT5V suspend voltage (+5V, 500mA Standby) – This voltage is
supplied from ATX power supply. This voltage is required for normal
operation.
NOTE
If the +5V suspend voltage is not present on the Power On connector (J30, pin
1) the LittleBoard 735 will not completely power on. The board will have
power (+5V), but it will not start the boot process and will never completely
power up.
Table 3-19. Power-On Button Interface Pin Signals (J46)
Pin #
Signal
Description
1
PWRON
Power-On Button input (connect between pins 1 & 2)
2
GND
Ground
3
RST_SW
Reset Switch input or output (connect between pins 3 & 2)
4
NC
Not Connected
5
NC
Not Connected
Summary of Contents for LittleBoard 735
Page 1: ...LittleBoard 735 Single Board Computer Reference Manual P N 50 1Z020 1000 ...
Page 6: ...Contents vi Reference Manual LittleBoard 735 ...
Page 46: ...Chapter 3 Hardware 40 Reference Manual LittleBoard 735 ...
Page 50: ...Chapter 4 BIOS Setup 44 Reference Manual LittleBoard 735 ...
Page 52: ...Appendix A Technical Support 46 Reference Manual LittleBoard 735 ...