emc2101 Standard Microsystems Corp., emc2101 Datasheet - Page 30

• Manufacturer Part Number: emc2101
• Description: Emc2101 Fan Control With 1?c Accurate Temperature Monitoring
• Manufacturer: Standard Microsystems Corp.

Revision 2.53 (02-19-08)
17h
18h
19h
21h
46h
47h
48h
49h
4Ah
4Bh
4Ch
4Dh
4Eh
4Fh
50h
51h
52h
53h
54h
55h
REGISTER
ADDRESS
R/W
R/W
R/W
R/W
R
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W (See
Note
R/W (See
Note
R/W (See
Note
R/W (See
Note
R/W (See
Note
R/W (See
Note
R/W
6.1)
6.1)
6.1)
6.1)
6.1)
6.1)
Table 6.1 Register Set in Hexadecimal Order (continued)
External Diode Ideality
Factor
Beta Compensation Factor
TCRIT Temp Limit
TCRIT Hysteresis
TACH Reading Low Byte
TACH Reading High Byte
TACH Limit Low Byte
TACH Limit High Byte
FAN Configuration
Fan Spin-up
Fan Setting
PWM Frequency
PWM Frequency Divide
Lookup Table Hysteresis
Lookup Table Temp Setting 1
Lookup Table Fan Setting 1
Lookup Table Temp Setting 2
Lookup Table Fan Setting 2
Lookup Table Temp Setting 3
Lookup Table Fan Setting 3
REGISTER NAME
DATASHEET
30
SMBus Fan Control with 1°C Accurate Temperature Monitoring
Sets ideality factor based
on diode type
Compensates for
transistors with various
beta factors
Fan will be set to full speed
if external temp above this
value
Amount of hysteresis
applied to TCRIT Temp
(1LSB = 1°C)
Stores the lower 6 bits of
the TACH count. and the
TACH configuration bits
Stores the upper 8 bits of
the TACH count.
Stores the lower 6 bits of
the TACH Limit
Stores the upper 8 bits of
the TACH Limit
defines polarity of PWM or
DAC
Sets Spin Up options
Sets PWM or DAC value
Sets the final PWM
Frequency
Sets the base PWM
frequency
Amount of hysteresis
applied to Lookup Table
Temp (1LSB = 1°C)
Look Up Table
Temperature Setting 1
Temp Setting 1
Look Up Table
Temperature Setting 2
Temp Setting 2
Look Up Table
Temperature Setting 3
Temp Setting 3
Associated Fan Setting for
Associated Fan Setting for
Associated Fan Setting for
FUNCTION
12h
(1.008)
08h
55h
(85°C)
0Ah
(10°C)
FFh
FFh
FFh
FFh
20h
3Fh
00h
17h
01h
04h
(4°C)
7Fh
3Fh
7Fh
3Fh
7Fh
3Fh
DEFAULT
VALUE
SMSC EMC2101
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Datasheet
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