Specifications

Chapter 3 Hardware
ReadyBoard 800 Reference Manual 53
Power Interfaces (J1, J2)
The ReadyBoard 800 uses various voltages onboard, but only one voltage is required externally (+5
volts) through the external connector, which uses a 4-pin header with 0.200" (5.08 mm) spacing. The
optional +12V volts is also provided on the input connector, but is not used on the board except for LCD
panel power and for PCI or optional ISA bus power. All other onboard voltages, including the CPU core
voltages, are derived from the externally supplied +5 volts DC +/- 5%.
Power In Interface (J2)
Table 3-27 list the pin outs and signals for Power interface connector (J2).
Table 3-22. Power In Interface Pin/Signal Descriptions (J2)
Pin # Signal Description
1 +5V +5.0 volts DC +/- 5%
2 GND Ground
3 GND Ground
4 +12V This +12V is for PCI-104 bus power and LCD power only (optional).
Notes: The shaded area denotes power or ground. The +12V on the Power Interface connector (J2) is
used for the LCD panel, PCI Bus, and optional ISA Bus power, but may also be supplied externally.
Power-On Interface (J1)
The signals on this connector allow the ATX power supply to be turned off (soft off) by the
ReadyBoard. If you use a non-ATX power supply (lab supply or AT power supply) you must connect J1
pin-1 to +5V (pin-1 on J2) to enable the ReadyBoard 800 to power on completely. However, if you use
a non-ATX power supply, then you won’t have the soft off feature normally provided by ATX power
supplies.
Table 3-23. Power-On Header Pin/Signal Descriptions (J1)
Pin # Signal Description
1 VCCSB +5V suspend voltage (+5V, 100mA Standby) – This voltage is supplied from
ATX power supply. This voltage is required for normal operation.
2 GND Ground
3 PS_ON* Power Supply On – This signal is sent to the ATX power supply by the
ReadyBoard 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.
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.
NOTE If the +5V suspend voltage is not present on the Power-On header (J1, pin-1)
the ReadyBoard 800 will not completely power on. The board will have
power (+5V), but it will not start the boot process and will never power up
completely.