Desktop Board Features
23
Fan Speed, Thermal, and Voltage Monitoring and
Control
Features of the board’s fan speed, thermal, and voltage monitoring and control
subsystem include:
• Monitoring of power supply voltages to detect levels above and below acceptable
values.
• Smart fan control provided by the legacy I/O controller, delivering acoustically-
optimized thermal management. Fan speed controllers and sensors are integrated
into the legacy I/O controller.
• Thermally monitored closed-loop fan control, for all onboard fans, that can adjust
fan speed according to thermal conditions.
• Two thermal sensors (processor and a remote thermal sensor).
Chassis Intrusion
The board supports a chassis security feature that detects if the chassis cover has
been removed. The security feature uses a mechanical switch on the chassis that can
be connected to the chassis intrusion header on the Desktop Board. See Figure 21 for
the location of the c
h
assis intrusion header.
Power Management Features
Power management is implemented at several levels, including:
• Software support through the Advanced Configuration and Power Interface (ACPI)
• Hardware support:
⎯ Power connectors
⎯ Fan headers
⎯ LAN wake capabilities
⎯ Instantly Available PC technology (Suspend to RAM)
⎯ +5 V standby power indicator LED
⎯ Wake from USB
⎯ Wake from serial
⎯ Power Management Event signal (PME#) wakeup support
⎯ WAKE# signal wake-up support
⎯ Wake from PS/2
ACPI
ACPI gives the operating system direct control over the power management and Plug
and Play functions of a computer. The use of ACPI with the Desktop Board requires an
operating system that provides full ACPI support.
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