Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown
Datasheet
Table 6.50 Look Up Table 1 Registers (continued)
TACH /
DRIVE
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
LUT 1 Ext
Diode 2
Setting 1
7Fh
(127°C)
X
-
64
32
16
8
4
2
1
53h
R/W
LUT 1 VIN2
Setting 1
7Fh
(0.4V)
X
X
752.9
-
376.5
64
188.2
32
94.12
16
47.06
8
23.53
4
11.76
2
5.88
1
LUT 1 Temp
3 Setting 1
7Fh
(127°C)
54h
R/W
LUT 1
Voltage 3
Setting 1
7Fh
(0.4V)
X
X
752.9
-
376.5
64
188.2
32
94.12
16
47.06
8
23.53
4
11.76
2
5.88
1
LUT 1 Temp
4 Setting 1
7Fh
(127°C)
55h
...
R/W
...
...
...
‘0’
‘1’
...
...
2048
64
...
1024
32
...
512
16
...
256
8
...
128
4
...
64
2
...
32
1
.. .
4096
128
LUT 1 Drive
Setting 8
74h
R/W
92h
LUT 1 Ext
Diode 1
Setting 8
7Fh
(127°C)
X
X
X
-
752.9
-
64
376.5
64
32
188.2
32
16
94.12
16
8
47.06
8
4
23.53
4
2
11.76
2
1
5.88
1
75h
R/W
LUT 1 VIN1
Setting 8
7Fh
(0.4V)
LUT 1 Ext
Diode 2
Setting 8
7Fh
(127°C)
76h
77h
R/W
R/W
LUT 1 VIN2
Setting 8
7Fh
(0.4V)
X
X
752.9
-
376.5
64
188.2
32
94.12
16
47.06
8
23.53
4
11.76
2
5.88
1
LUT 1 Temp
3 Setting 8
7Fh
(127°C)
LUT 1
Voltage 3
Setting 8
7Fh
(0.4V)
X
752.9
376.5
188.2
94.12
47.06
23.53
11.76
5.88
LUT 1 Temp
4 Setting 8
7Fh
(127°C)
78h
79h
R/W
R/W
X
X
-
-
64
-
32
-
16
16
8
8
4
4
2
2
1
1
LUT 1 Temp
Hysteresis
0Ah
The Look Up Table 1 Registers hold the 40 entries of the Look Up Table that controls the drive of Fan
1. As the temperature (or voltage) channels are updated, the measured value for each channel is
compared against the respective entries in the Look Up Table and the associated drive setting is
loaded into an internal shadow register and stored.
The bit weighting for temperature inputs represents °C and is compared against the measured data.
Note that the LUT entry does not include a sign bit. The Look Up Table does not support negative
temperature values and the MSBit should not be set for a temperature input.
The bit weighting for voltage inputs represents mV above 0V and is compared against the measured
data.
SMSC EMC2104
Revision 1.74 (05-08-08)
DATA7S7HEET
SMSC [ SMSC CORPORATION ]
