ACPI features
17
Environmental temperature control
The thermal control sensor monitors the CPU temperature in real time and turns on the thermal
control fan whenever the CPU temperature exceeds a user-defined threshold. The overheat
circuitry runs independently from the CPU. Once the sensor detects that the CPU temperature is
too high, it automatically turns on the thermal fan control to prevent any overheat damage to
the CPU. The onboard chassis thermal circuitry can monitor the overall system temperature and
alert users when the chassis temperature is too high.
W
ARNING! To avoid system overheating, be sure to provide adequate air flow to the
system.
ACPI features
The ACPI (Advanced Configuration and Power Interface) specification defines a flexible and
abstract hardware interface that provides a standard way to integrate power management
features throughout a PC system, including its hardware, operating system and application
software. This enables the system to automatically turn on and off peripherals such as
CD-ROMs, network cards, hard disk drives, and printers.
In addition to enabling operating system-directed power management, ACPI provides a generic
system event mechanism for plug and play and an operating system-independent interface for
configuration control. ACPI leverages the plug-and-play BIOS data structures while providing a
processor architecture-independent implementation that is compatible with operating systems
that implement some form of ACPI.
Slow blinking LED for suspend-state indicator
When the CPU goes into a suspend state, the chassis power LED starts blinking to indicate that
the CPU is in suspend mode. When the user presses any key, the CPU wakes up and the LED
automatically stops blinking and remains on.
Main switch override mechanism
When an ATX power supply is used, the power button can function as a system suspend button
to make the system enter a SoftOff state. The monitor is suspended and the hard drive spins
down. Pressing the power button again causes the whole system to wake up. During the SoftOff
state, the ATX power supply provides power to keep the required circuitry in the system alive. In
case the system malfunctions and you want to turn off the power, press and hold the power
button for four seconds. This option can be set in the Power section of the BIOS Setup routine.
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