emc2104 Standard Microsystems Corp., emc2104 Datasheet - Page 41

• Manufacturer Part Number: emc2104
• Description: Emc2104 Dual Rpm-based Pwm Fan Controller With Hardware Thermal Shutdown
• Manufacturer: Standard Microsystems Corp.

Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown
Datasheet
SMSC EMC2104
ADDR
4Ch
4Dh
40h
41h
42h
43h
45h
46h
47h
48h
49h
4Ah
4Bh
4Eh
4Fh
50h
51h
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
Fan 1 Valid TACH
TACH 1 Reading
TACH 1 Reading
Fan 1 Drive Fail
Fan 1 Drive Fail
Fan 1 Minimum
Band High Byte
Configuration 1
Configuration 2
Band Low Byte
TACH 1 Target
TACH 1 Target
PWM 1 Divide
Fan 1 Spin Up
LUT 1 Drive 1
Fan 1 Setting
Configuration
Configuration
REGISTER
Fan 1 Step
High Byte
High Byte
Low Byte
Low Byte
Gain 1
NAME
LUT 1
Fan 1
Fan 1
Count
Drive
Table 6.1 EMC2104 Register Set (continued)
driver input setting for Fan 1. If the RPM
Holds the target tachometer reading low
Holds the tachometer reading high byte
Stores and controls the configuration for
based Fan Speed Control Algorithm for
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
based Fan Speed Control Algorithm is
Sets configuration values for the RPM
Sets the maximum change per update
Sets the configuration values for Spin
disabled, allows direct user control of
Sets the minimum drive value for the
Always displays the most recent fan
Stores the lowest programmed drive
Holds the target tachometer reading
that indicates the fan is spinning
Stores the divide ratio to set the
Up Routine of the Fan 1 driver
Look Up Table 1 (LUT1)
Fan 1 Control Registers
DATASHEET
frequency for Fan 1
for the Fan 1 driver
high byte for Fan 1
setting for LUT 1
the Fan 1 driver
the Fan 1 driver
the Fan 1 driver
the fan driver.
Fan 1 driver
FUNCTION
scale drive
byte Fan 1
for Fan 1
for Fan 1
properly
LUT 1
41
DEFAULT
VALUE
(40%)
2Bh
2Ah
FFh
FFh
FBh
00h
01h
38h
19h
10h
66h
F5h
00h
00h
F8h
F8h
00h
Revision 1.74 (05-08-08)
Lock 1
LOCK
SWL
SWL
SWL
SWL
SWL
SWL
SWL
SWL
LUT
No
No
No
No
No
No
No
No
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