emc2105 Standard Microsystems Corp., emc2105 Datasheet - Page 68

• Manufacturer Part Number: emc2105
• Description: Emc2105 Rpm-based High Side Fan Controller With Hardware Thermal Shutdown
• Manufacturer: Standard Microsystems Corp.

ADDR
51h
52h
53h
54h
55h
74h
...
APPLICATION NOTE: When any of the External Diode 1, External Diode 2, and External Diode 3 channels are
Revision 1.74 (05-08-08)
6.30
R/W
R/W
R/W
R/W
R/W
R/W
R/W
...
LUT Temp 3
LUT Voltage
LUT Temp 4
REGISTER
3 Setting 1
LUT Drive
LUT Drive
1
0
0
1
1
LUT VIN1
LUT VIN2
Setting 1
Setting 1
Setting 1
Setting 1
Setting 1
Setting 1
Setting 1
Setting 8
LUT Ext
LUT Ext
Diode 1
Diode 2
Look Up Table Registers
TEMP4_CFG [1:0]
...
configured to operate as voltage inputs, the voltage data is used in the Look Up Table instead
of the corresponding temperature data. Therefore, the threshold settings must be updated
accordingly. All voltage channels (including VIN1, VIN2, and VIN3) are assumed to be
increasing (i.e. a larger voltage reading indicates a higher fan speed).
TACH /
DRIVE
‘0’
‘1’
‘0’
‘1’
...
X
X
X
X
X
X
X
0
0
1
0
1
Table 6.46 Look Up Table Registers
752.9
752.9
752.9
4096
4096
Table 6.45 TEMP4_CFG Decode
128
128
B7
...
-
-
-
-
DATASHEET
376.5
376.5
376.5
2048
2048
B6
64
64
64
64
64
64
...
RPM-Based High Side Fan Controller with Hardware Thermal Shutdown
68
188.2
188.2
188.2
1024
1024
B5
32
32
32
32
32
32
...
TEMPERATURE CHANNEL USED
94.12
94.12
94.12
512
512
B4
16
16
16
16
16
16
Pushed Temperature 2 (LUT)
...
Internal Diode (default)
External Diode 4
47.06
47.06
47.06
256
256
B3
...
8
8
8
8
8
8
Reserved
23.53
23.53
23.53
128
128
B2
...
4
4
4
4
4
4
11.76
11.76
11.76
B1
64
64
...
2
2
2
2
2
2
SMSC EMC2105
5.88
5.88
5.88
B0
32
32
...
1
1
1
1
1
1
Datasheet
DEFAULT
(127°C)
(127°C)
(127°C)
(127°C)
(0.4V)
(0.4V)
(0.4V)
FBh
7Fh
7Fh
7Fh
7Fh
7Fh
7Fh
7Fh
92h
.. .