emc2105 Standard Microsystems Corp., emc2105 Datasheet - Page 41

• Manufacturer Part Number: emc2105
• Description: Emc2105 Rpm-based High Side Fan Controller With Hardware Thermal Shutdown
• Manufacturer: Standard Microsystems Corp.

RPM-Based High Side Fan Controller with Hardware Thermal Shutdown
Datasheet
SMSC EMC2105
ADDR
4Ch
4Dh
43h
45h
46h
47h
48h
49h
4Ah
4Bh
4Eh
4Fh
50h
51h
52h
53h
54h
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R
TACH Target High
LUT Configuration
TACH Target Low
Fan Valid TACH
Band High Byte
Configuration 2
Band Low Byte
Fan Drive Fail
Fan Drive Fail
TACHReading
TACHReading
Fan Minimum
Configuration
Fan Spin Up
LUT Temp 1
LUT Temp 2
LUT Temp 3
LUT Drive 1
REGISTER
High Byte
Low Byte
Fan Step
Setting 1
Setting 1
Setting 1
NAME
Count
Drive
Gain
Byte
Byte
Fan
Table 6.1 EMC2105 Register Set (continued)
Holds the target tachometer reading low
Holds the tachometer reading high byte
Stores and controls the configuration for
External Diode 1 (or VIN1) channel that
External Diode 2 (or VIN2) channel that
temp) that is associated with the Drive 1
based Fan Speed Control Algorithm for
Holds the minimum tachometer reading
Stores the number of Tach counts used
Holds the gain terms used by the RPM
Sets additional configuration values for
to determine how the actual fan speed
must match the target fan speed at full
Holds the tachometer reading low byte
Sets the maximum change per update
TRIP_SET voltage or Pushed Temp 1
Sets the configuration values for Spin
External Diode 3 channel (or VIN3 or
Sets the minimum drive value for the
Stores the lowest programmed drive
Holds the target tachometer reading
is associated with the Drive 1 value
is associated with the Drive 1 value
Stores the threshold level for the
Stores the threshold level for the
Stores the threshold level for the
that indicates the fan is spinning
Up Routine of the Fan driver
Look Up Table (LUT)
high byte for the Fan
DATASHEET
setting for the LUT
for the Fan driver
the Fan driver
the Fan driver
byte the Fan
FUNCTION
for the Fan
for the Fan
scale drive
Fan driver
properly
41
value
LUT
DEFAULT
(127°C)
(127°C)
(127°C)
VALUE
(40%)
2Ah
FFh
FFh
FBh
38h
19h
10h
66h
F5h
00h
00h
F8h
F8h
00h
7Fh
7Fh
7Fh
Revision 1.74 (05-08-08)
LOCK
SWL
SWL
SWL
SWL
SWL
SWL
SWL
SWL
Lock
Lock
Lock
Lock
LUT
LUT
LUT
LUT
No
No
No
No
No
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