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MITSUBISHI ELECTRIC MOTHERBOARD DIVISION PAGE 23 OF 45
There are three main elements to the optional system management hardware.
MAX1617 Thermal Monitor
PC87366 Super I/O
Processor thermal diode ADCs
A precise digital thermometer that reports both the CPU temperature and the temperature of
itself – system temperature. It is accessed via the ICH SMbus interface.
The National Semiconductor PC87366 provides the system monitor functions as described
below. It provides the following functions.
Fan monitoring. The two inputs to the PC87366 device monitor the first two ATX
“fantach” signals.
Monitoring of system +12V, -12V, +5V, +3.3V, VCPU, +2.5V, +1.8V and +1.5V power
rails
Monitoring of chassis intrusion (top cover)
The system fan is controlled by the motherboard such that it stops rotating when the system is in
‘Suspend’ mode. FC810 microATX motherboard supports variable fan speed control in which
the speed of the fan is raised as the temperature of the processor increases. This considerably
reduces fan noise in normal operation.
The variable fan speed option can only be used with an ACPI-aware operating system (such as
Windows 98). This feature requires separate programming and you should contact Mitsubishi
Electric Motherboard Division for further details.
Four PCI bus master slots are available.