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Chapter 3
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" (5.08mm) 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 ISA bus power. All other onboard voltages are derived from the
externally supplied +5 volts DC +/- 5%. The onboard voltages also provide the CPU core.
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
1
+5V
2
GND
3
GND
4
+12V
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 ISA Bus power, and is usually 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
J2 pin-1 to +5V (from the power interface connector, J1) 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
1
VCCSB
2
GND
3
PS_ON*
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 therefore will never power up completely.
54
Description
+5.0 volts DC +/- 5%
Ground
Ground
This +12V is for PCI-104 bus power and LCD power only (optional).
Description
+5V suspend voltage (+5V, 100mA Standby) – This voltage is supplied
from ATX power supply. This voltage is required for normal operation.
Ground
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.
Reference Manual
Hardware
ReadyBoard 800
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