Specifications

Chapter 3 Hardware
54 Reference Manual ReadyBoard 800
Optional CPU Fan (J7)
Table 3-24 lists the pins and signals of the optional CPU Fan and it has 3 pins, single row, with
0.100" pin spacing.
Table 3-24. Optional CPU Fan (J7)
Pin # Signal Description
1 Fan_Tach Fan Tachometer – This signal indicates Fan speed.
2 +12V +12.0 volts DC +/- 5%
3 GND Ground
Note: The shaded area denotes power or ground.
Power and Sleep States
The following information only applies if an ATX power supply is used to provide power to the
ReadyBoard 800. If a non-ATX power supply is used, then the ReadyBoard 800 is only controlled by
the Power On/Off switch on the power supply and the various sleep states are not available. The sleep
states are OS dependent and not available if your OS does not support power management based on the
ACPI standard.
Power On Switch
The Power On switch turns the ReadyBoard 800 and its attached power supply to a fully On condition, if
you are using an ATX power supply. Normally, if the operating system (OS) supports sleep states, the
OS will turn Off the ReadyBoard and its power supply during the OS shut down process. If the OS
supports sleep states, the Power On button typically, will also transition the ReadyBoard and its power
supply between a fully Powered On state, various sleep states depending on the OS control setting, and a
fully Powered Off state. If the OS does not support sleep states, then the Power On button only turns
power On or Off to the ReadyBoard 800.
An OS supporting ACPI, typically allows the Power-On switch to be configured through a user
interface. The Power-On switch for the ReadyBoard 800 is provided externally by connecting a
momentary switch between pins-1 and -2 on the Utility connector (J12). The power on signal occurs
when ground is placed on pin-1 of J12.
Sleep States (ACPI)
The ReadyBoard 800 supports the ACPI (Advanced Configuration and Power Interface) standard, which
is a key component of certain Operating Systems’ (OS’s) power management. The supported features
(sleep states) listed here are only available when an ACPI-compliant OS is used for the ReadyBoard,
such as Windows 98/2000/ME/XP. The term “sleep” state refers to a low latency (reduced power
consumption) state, which can be re-started (awakened) restoring full operation to the ReadyBoard 800.
In these various sleep states, the ReadyBoard 800 appears to be off, indicated by such things as no
display on the attached monitor and no activity for the connected CD-ROM or hard drives. Normally,
when a computer detects certain activity (i.e. power switch, mouse, keyboard, or certain types of LAN
activity), it returns to a fully operational state.
NOTE Currently, the Power-On switch is the only activity that will wake the
ReadyBoard 800 from a powered down state, such as Standby (S1),
Hibernate (S4) and Power Off (S5).
The ReadyBoard 800 supports at least four ACPI power states, depending on the operating system used
and its ability to manage sleep states. Typically, the power on switch is used to wake up from a sleep
state, or transition from one state to another, but this is dependent on the operating system.