W83627DHG Nuvoton Technology Corporation of America, W83627DHG Datasheet - Page 54

• Manufacturer Part Number: W83627DHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627DHG

• Applications: PC's, PDA's
• Interface: LPC
• Voltage - Supply: 3.3V
• Package / Case: 128-XFQFN
• Mounting Type: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Thermal Cruise
range is defined in BIOS by a temperature and the interval (e.g., 55 °C ± 3 °C). As long as the current
temperature remains below the low end of this range (i.e., 52 °C), the fan is off. Once the temperature
exceeds the low end, the fan turns on at a speed defined in BIOS (e.g., 20% output). Thermal Cruise
mode then controls the fan output according to the current temperature. Three conditions may occur:
In general, Thermal Cruise
The following figures illustrate two examples of Thermal Cruise
(1) If the temperature still exceeds the high end, fan output increases slowly. If the fan is operating
at full speed but the temperature still exceeds the high end, a warning message is issued to protect
the system.
(2) If the temperature falls below the high end (i.e., 58 °C) but remains above the low end (e.g., 52
°C), fan output remains the same.
(3) If the temperature falls below the low end (e.g., 52 °C), fan output decreases slowly to zero or to
a specified “stop value”. This stop value is enabled by Bank0 Index 12h, bits 3 ~ 5, and the value
itself is specified in Bank0 Index 08h, Index 09h, Index 15h, and Index 64h. The fan remains at the
stop value for the period of time defined in Bank0 Index 0Ch, Index 0Dh, Index 17h, and Index 66h.
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•
•
if the current temperature is higher than the high end, increase the fan speed;
if the current temperature is lower than the low end, decrease the fan speed;
otherwise, keep the fan speed the same.
TM
mode controls the fan speed to keep the temperature in a specified range. First, this
TM
mode means
-42-
TM
Publication Release Date: Aug, 22, 2007
mode.
W83627DHG
Version 1.4
TM