RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
Table A.6 Fan Speed Control Table Example #2 (continued)
EXTERNAL
EXTERNAL
DIODE 2
TEMPERATURE
(GPU)
FAN
SPEED
STEP #
DIODE 1
TEMPERATURE
(CPU)
PUSHED
TEMPERATURE
SETTING (DTS1)
PUSHED
TEMPERATURE
SETTING (DTS2)
TACH
TARGET
09h
(6826 RPM)
7
8
90oC
105oC
110oC
80oC
85oC
80oC
08h
(7680 RPM)
100oC
100oC
Note: The values shown in Table A.6 are example settings. All the cells in the look-up table are
programmable via SMBus.
Table A.7 Fan Speed Determination for Example #2 (using settings in Table A.6)
EXTERNAL
DIODE 1
TEMPERATURE TEMPERATURE
EXTERNAL
DIODE 2
PUSHED
TEMPERATURE
(DTS1)
PUSHED
TEMPERATURE
(DTS2)
(CPU)
(GPU)
PWM RESULT
0Ch (5120 RPM) -
CPU requires highest
target
35°C
50°C
Example 1:
Example 2:
75°C
75°C
(translated as 65°C) (translated as 50°C)
15°C
20°C
08h (7680 RPM) -
DTS1 requires
highest target
75°C
75°C
90°C
(translated as
(translated as 80°C)
85°C)
5°C
09h (6826 RPM) -
DTS2 requires
highest target
30°C
Example 3:
97.25°C
(translated as
(translated as 70°C)
95°C)
SMSC EMC2103
Revision 0.85 (01-29-08)
DATA7S9HEET
SMSC [ SMSC CORPORATION ]
