RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
Table 6.35 Error Range Options
ERR_RNG[1:0]
1
0
OPERATION
0
0
1
1
0
1
0
1
0 RPM (default)
50 RPM
100 RPM
200 RPM
The Fan Configuration 2 Register is Software Locked.
6.24
Gain Register
Table 6.36 Gain Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
45h
R/W
Gain Register
-
-
GAIND[1:0]
GAINI[1:0]
GAINP[1:0]
2Ah
The Gain Register stores the gain terms used by the proportional and integral portions of the RPM
based Fan Speed Control Algorithm. These terms will affect the FSC closed loop acquisition,
overshoot, and settling as would be expected in a classic PID system.
Table 6.37 Gain Decode
GAIND OR GAINP OR GAINI [1:0]
1
0
RESPECTIVE GAIN FACTOR
0
0
1
1
0
1
0
1
1x
2x
4x (default)
8x
6.25
Fan Spin Up Configuration Register
Table 6.38 Fan Spin Up Configuration Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
Fan Spin Up
Configuration
DRIVE_FAIL
_CNT [1:0]
NOK
ICK
SPINUP_TIME
[1:0]
46h
R/W
SPIN_LVL[2:0]
19h
The Fan Spin Up Configuration Register controls the settings of Spin Up Routine.
Revision 0.85 (01-29-08)
SMSC EMC2103
DATA5S8HEET
SMSC [ SMSC CORPORATION ]
