RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
Chapter 6 Register Set
6.1
Register Map
The following registers are accessible through the SMBus Interface. All register bits marked as ‘-’ will
always read ‘0’. A write to these bits will have no effect.
APPLICATION NOTE: All registers denoted with a ** are specific to the EMC2103-2 only. Writing to these registers
by the EMC2103-1 will have no affect and reading from them will return ‘00h’.
Table 6.1 EMC2103 Register Set
REGISTER
NAME
DEFAULT
VALUE
ADDR
R/W
FUNCTION
LOCK
PAGE
Temperature Registers
00h
R
Internal Temp
Reading High
Byte
Stores the integer data of the Internal
Diode
00h
No
Page 42
01h
02h
R
R
Internal Temp
Reading Low Byte
Stores the fractional data of the
Internal Diode
00h
00h
No
No
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Page 42
External Diode 1
Temp Reading
High Byte
Stores the integer data of External
Diode 1
03h
R
R
R
R
R
R
External Diode 1
Temp Reading
Low Byte
Stores the fractional data of External
Diode 1
00h
00h
00h
00h
00h
N/A
No
No
No
No
No
No
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Page 42
Page 42
Page 42
Page 42
Page 43
04h **
05h **
06h **
07h **
0Ah
External Diode 2
Temp Reading
High Byte **
Stores the integer data of External
Diode 2
External Diode 2
Temp Reading
Low Byte **
Stores the fractional data of External
Diode 2
External Diode 3
Temp Reading
High Byte **
Stores the integer data of External
Diode 3
External Diode 3
Temp Reading
Low Byte **
Stores the fractional data of External
Diode 3
Critical/Thermal
Shutdown
Temperature
Stores the calculated Critical/Thermal
Shutdown temperature high limit
derived from TRIP_SET pin voltage
0Ch
0Dh
10h
R/W
R/W
R
Pushed
Temperature 1
Stores the integer data for Pushed
Temperature 1 to drive the LUT
00h
00h
FFh
No
No
No
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Page 43
Page 44
Pushed
Temperature 2
Stores the integer data for Pushed
Temperature 2 to drive the LUT
TRIP_SET
Voltage
Stores the measured voltage on the
TRIP_SET pin
SMSC EMC2103
Revision 0.85 (01-29-08)
DATA3S5HEET
SMSC [ SMSC CORPORATION ]
