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EMC2104 Datasheet(PDF) 77 Page - SMSC Corporation

Part # EMC2104
Description  Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown
PDF  101 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

EMC2104 Datasheet(HTML) 77 Page - SMSC Corporation

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Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown
Datasheet
SMSC EMC2104
77
Revision 1.74 (05-08-08)
DATASHEET
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.
53h
R/W
LUT 1 Ext
Diode 2
Setting 1
X
-
64
32
16
8
4
2
1
7Fh
(127°C)
LUT 1 VIN2
Setting 1
X
752.9
376.5
188.2
94.12
47.06
23.53
11.76
5.88
7Fh
(0.4V)
54h
R/W
LUT 1 Temp
3 Setting 1
X
-
64
32
16
8
4
2
1
7Fh
(127°C)
LUT 1
Voltage 3
Setting 1
X
752.9
376.5
188.2
94.12
47.06
23.53
11.76
5.88
7Fh
(0.4V)
55h
R/W
LUT 1 Temp
4 Setting 1
X
-
64
32
16
8
4
2
1
7Fh
(127°C)
...
...
...
...
...
...
...
...
...
...
...
...
.. .
74h
R/W
LUT 1 Drive
Setting 8
‘0’
4096
2048
1024
512
256
128
64
32
92h
‘1’
128
64
32
16
8
4
2
1
75h
R/W
LUT 1 Ext
Diode 1
Setting 8
X
-
64
32
16
8
4
2
1
7Fh
(127°C)
LUT 1 VIN1
Setting 8
X
752.9
376.5
188.2
94.12
47.06
23.53
11.76
5.88
7Fh
(0.4V)
76h
R/W
LUT 1 Ext
Diode 2
Setting 8
X
-
64
32
16
8
4
2
1
7Fh
(127°C)
LUT 1 VIN2
Setting 8
X
752.9
376.5
188.2
94.12
47.06
23.53
11.76
5.88
7Fh
(0.4V)
77h
R/W
LUT 1 Temp
3 Setting 8
X
-
64
32
16
8
4
2
1
7Fh
(127°C)
LUT 1
Voltage 3
Setting 8
X
752.9
376.5
188.2
94.12
47.06
23.53
11.76
5.88
7Fh
(0.4V)
78h
R/W
LUT 1 Temp
4 Setting 8
X
-
64
32
16
8
4
2
1
7Fh
(127°C)
79h
R/W
LUT 1 Temp
Hysteresis
X
-
-
-
16
84
21
0Ah
Table 6.50 Look Up Table 1 Registers (continued)
ADDR
R/W
REGISTER
TACH /
DRIVE
B7B6
B5B4
B3B2
B1B0
DEFAULT



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