Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown
Datasheet
Table B.2 Look Up Table Example #1 Configuration
ADDR
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
SETTING
USE_D
TS_F1
USE_D
TS_F2
LUT_L
OCK
TACH /
DRIVE
TEMP3_CFG
[1:0]
TEMP4_CFG
[1:0]
LUT 1
Configuration
50h
C0h
0
0
1
1
0
0
0
0
Table B.3 Fan Speed Control Table Example #1
EXTERNAL
EXTERNAL
DIODE 2
TEMPERATURE
(GPU)
EXTERNAL
DIODE 3
TEMPERATURE
(SKIN)
FAN
SPEED
STEP #
DIODE 1
TEMPERATURE
(CPU)
INTERNAL DIODE
TEMPERATURE
(AMBIENT)
FAN DRIVE
SETTINGS
1
2
3
4
5
6
7
8
35oC
40oC
50oC
60oC
70oC
80oC
90oC
100oC
60oC
70oC
75oC
80oC
85oC
90oC
95oC
100oC
30oC
35oC
40oC
45oC
50oC
55oC
60oC
65oC
40oC
45oC
50oC
55oC
60oC
65oC
70oC
75oC
0%
30%
40%
50%
60%
70%
80%
100%
Note: The values shown in Table B.3 are example settings. All the cells in the look-up table are
programmable via SMBus.
Table B.4 Fan Speed Determination for Example #1 (using settings in Table B.3)
EXTERNAL
DIODE 1
TEMPERATURE
(CPU)
EXTERNAL
DIODE 2
TEMPERATURE
(GPU)
EXTERNAL DIODE
3 TEMPERATURE
(SKIN)
INTERNAL DIODE
TEMPERATURE
(AMBIENT)
FAN DRIVE
SETTING RESULT
70% (CPU temp
requires highest drive)
Example 1:
Example 2:
Example 3:
82°C
97°C
97°C
48°C
62°C
62°C
58°C
58°C
75°C
82°C
82C°
82°C
80% (GPU and Skin
require highest drive)
100% (Internal temp
requires highest drive)
Revision 1.74 (05-08-08)
SMSC EMC2104
DATA9S2HEET
SMSC [ SMSC CORPORATION ]
