RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
Table 6.1 EMC2102 Register Set (continued)
REGISTER
NAME
DEFAULT
VALUE
ADDR
R/W
FUNCTION
LOCK
PAGE
Temperature Limit Registers
High limit for External Diode 1
41h
42h
43h
R/W
R/W
R/W
External Diode 1
Temp High Limit
55h
SWL
SWL
SWL
(+85°C)
Page
40
External Diode 2
Temp High Limit
High limit for External Diode 2
High limit for External Diode 3
Fan Control Registers
55h
(+85°C)
External Diode 3
Temp High Limit
55h
(+85°C)
51h
R/W
Fan Driver Setting
Always displays the most recent fan
driver input setting. If the RPM based
Fan Control Algorithm is disabled,
allows direct user control of the fan
driver.
00h
No
Page
40
52h
53h
54h
55h
56h
57h
58h
R/W
R/W
R/W
R/W
R/W
R/W
R
Fan Configuration
Sets configuration values for the RPM
based Fan Control Algorithm
CBh
01h
10h
80h
F5h
No
Page
41
Fan Spin Up
Configuration
Sets the configuration values for Spin
Up Routine of the High Side Fan Driver
SWL
SWL
SWL
SWL
No
Page
42
Fan Step
Sets the maximum change per update
for the High Side Fan Driver
Page
43
Fan Minimum
Drive
Sets the minimum drive value for the
High Side Fan Driver
Page
43
Fan Valid TACH
Count
Holds the minimum TACH value that
indicates the fan is spinning properly
Page
44
TACH Target
Holds the target TACH count for the fan FAh
Page
44
TACH Reading
Holds the TACH count for the fan
FFh
No
Page
44
Revision Registers
FDh
FFh
R
R
Product ID
Revision
Stores the unique Product ID
14h
00h
No
No
Page
45
Revision
Page
45
During Power-On-Reset (POR), the default values are stored in the registers. A POR is initiated when
power is first applied to the part and the voltage on the VDD_3V supply surpasses the POR level as
specified in the electrical characteristics. Any reads to undefined registers will return 00h. Writes to
undefined registers will not have an effect.
6.1.1
Lock Entries
The Lock Column describes the locking mechanism, if any, used for individual registers. All SWL
registers are Software Locked and therefore made read-only when the LOCK bit is set.
Revision 1.95 (10-19-06)
SMSC EMC2102
DATA3S2HEET
SMSC [ SMSC CORPORATION ]
