W83627EHF_0611 Datasheet, PDF (40/144 Pages) Winbond – WINBOND LPC I/O

W83627EHF/EF, W83627EHG/EG
Table 6.3-3 Relative Register-at Speed Cruise Mode of Smart Fan I control mode
THERMAL- TARGET-SPEED
CRUISE MODE
COUNT
TOLERANCE
KEEP MIN. FAN
OUTPUT VALUE
STEP-
DOWN
TIME
SYSFANOUT CR[05h]
CR[07h]
Bit0-3
CR[12h]
Bit5
CPUFANOUT0 CR[06h]
AUXFANOUT0 CR[13h]
CR[07h]
Bir4-7
CR[14h]
Bit0-3
CR[12h]
Bir4
CR[12h]
Bit3
CR[0Eh]
CPUFANOUT1 CR[63h]
CR[62h]
Bit0-3
CR[12h]
Bit6
STEP-UP
TIME
CR[0Fh]
SMART FAN^TM III
Concept
SMART FAN^TM III mode sets a target temperature through BIOS or application software and
W83627EHF/EHG controls the fan speed so that the temperature could meet the target temperature
set in the BIOS or software. Only Pin115 (CPUFANOUT0) and Pin120 (CPUFANOUT1) in
W83627EHF/EHG support SMART FAN^TM III. Pin115 (CPUFANOUT0) pairs with Pin103 (CPUTIN);
while Pin120 (CPUFANOUT1) pairs with Pin104 (SYSTIN), Pin103 (CPUTIN), or Pin102 (AUXTIN),
which is defined in Bank0 Index 4Ah.bit7~6.
Pin 103
CPUTIN
Pin 104
SYSTIN
Pin 102
AUXTIN
Pin 115
CPUFanOut0
Pin 120
CPUFanOut1
Figure 6.9, 6.10, and 6.11 illustrate SMART FAN^TM III mode, and the algorithm of fan speed control
is described as follows:
(1) Figure 6.9 shows the initial condition of SMART FAN^TM III. Target Temperature, Temperature
Tolerance, Maximum Fan Output and Minimum Fan Output must be set first. If the currently
measured temperature is within the (Target Temperature ± Temperature Tolerance), the fan
speed remains constant.
(2) In the case that currently measured temperature goes beyond (Target Temperature ＋
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