EMC2103 Datasheet, PDF (79/84 Pages) SMSC Corporation – RPM-Based Fan Controller with HW Thermal Shutdown

RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
Table A.6 Fan Speed Control Table Example #2 (continued)
FAN
SPEED
STEP #
EXTERNAL
DIODE 1
TEMPERATURE
(CPU)
EXTERNAL
DIODE 2
TEMPERATURE
(GPU)
PUSHED
TEMPERATURE
SETTING (DTS1)
PUSHED
TEMPERATURE
SETTING (DTS2)
7
90^oC
105^oC
80^oC
80^oC
8
100^oC
110^oC
85^oC
100^oC
TACH
TARGET
09h
(6826 RPM)
08h
(7680 RPM)
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
(CPU)
EXTERNAL
DIODE 2
TEMPERATURE
(GPU)
PUSHED
TEMPERATURE
(DTS1)
PUSHED
TEMPERATURE
(DTS2)
PWM RESULT
Example 1:
75°C
Example 2:
75°C
Example 3:
75°C
75°C
90°C
97.25°C
35°C
(translated as 65°C)
50°C
(translated as 50°C)
0Ch (5120 RPM) -
CPU requires highest
target
15°C
(translated as
85°C)
20°C
(translated as 80°C)
08h (7680 RPM) -
DTS1 requires
highest target
30°C
(translated as 70°C)
5°C
(translated as
95°C)
09h (6826 RPM) -
DTS2 requires
highest target
SMSC EMC2103
79
DATASHEET
Revision 0.85 (01-29-08)