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.
Table 6.1 EMC2102 Register Set
REGISTER
NAME
DEFAULT
VALUE
ADDR
R/W
FUNCTION
LOCK
PAGE
Temperature Registers
00h
01h
02h
03h
04h
R
R
R
R
R
Internal Temp
Reading
Stores the integer data of the Internal
Temp Reading
00h
00h
00h
00h
7Fh
No
No
No
No
No
Page
33
External Diode 1
Temp Reading
Stores the integer data of External
Diode 1
Page
33
External Diode 2
Temp Reading
Stores the integer data of External
Diode 2
External Diode 3
Temp Reading
Stores the integer data of External
Diode 3
Critical/Thermal
Shutdown
Temperature
Stores the calculated Critical/Thermal
Shutdown temperature high limit
derived from the voltage on TRIP_SET.
Page
34
Configuration and control
20h
R/W
Configuration
Configures the Thermal / Critical
Shutdown masking options and
software lock
80h
SWL
Page
34
21h
22h
23h
R/W
R-C
R-C
Conversion Rate
Configures the conversion rate
02h
80h
00h
SWL
No
Page
35
Interrupt Status
Register 1
Stores the status bits for temperature
channels
Page
36
Interrupt Status
Register 2
Stores the status bits for the thermal
shutdown and RPM based Fan Control
Algorithm
No
Page
37
24h
R/W
Interrupt Mask
Register
Controls the masking of interrupts on all
maskable channels
10h
No
Page
37
Diode Configuration
30h
31h
32h
R/W
R/W
R/W
External Diode 1
Beta
Configures the beta compensation
settings for External Diode 1
03h
03h
07h
SWL
SWL
SWL
Configuration
Page
38
External Diode 2
Beta
Configuration
Configures the beta compensation
settings for External Diode 2
External Diode
REC
Configuration
Configures the Resistance Error
Correction functionality for all external
diodes
Page
39
SMSC EMC2102
Revision 1.95 (10-19-06)
DATA3S1HEET
SMSC [ SMSC CORPORATION ]
