emc2104 Standard Microsystems Corp., emc2104 Datasheet - Page 76

• Manufacturer Part Number: emc2104
• Description: Emc2104 Dual Rpm-based Pwm Fan Controller With Hardware Thermal Shutdown
• Manufacturer: Standard Microsystems Corp.

ADDR
51h
52h
APPLICATION NOTE: When any of the External Diode 1, External Diode 2, and External Diode 3 channels are
Revision 1.74 (05-08-08)
6.33
R/W
R/W
R/W
LUT 1 Drive
LUT 1 VIN1
REGISTER
LUT 1 Ext
1
0
0
1
1
1
0
0
1
1
Setting 1
Setting 1
Setting 1
Diode 1
Bits 1-0 - TEMP4_CFG[1:0] - These bits determine the temperature channel that is used for the
Temperature 4 inputs to the Look Up Table as shown in
Look Up Table 1 Registers
TEMP3_CFG [1:0]
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’
X
X
Table 6.50 Look Up Table 1 Registers
0
0
1
0
1
0
0
1
0
1
752.9
4096
Table 6.48 TEMP3_CFG Decode
Table 6.49 TEMP4_CFG Decode
128
B7
-
DATASHEET
376.5
2048
B6
64
64
Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown
76
188.2
1024
B5
32
32
TEMPERATURE CHANNEL USED
TEMPERATURE CHANNEL USED
94.12
512
Pushed Temperature 1 (LUT1)
Pushed Temperature 3 (LUT2)
Pushed Temperature 2 (LUT1)
Pushed Temperature 4 (LUT2)
B4
16
16
TRIP_SET / VIN4 Voltage
External Diode 3 (default)
Table
Internal Diode (default)
External Diode 4
47.06
6.49.
256
B3
8
8
Reserved
Reserved
23.53
128
B2
4
4
11.76
B1
64
2
2
SMSC EMC2104
5.88
B0
32
1
1
Datasheet
DEFAULT
(127°C)
(0.4V)
FBh
7Fh
7Fh