RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
Table 6.35 Error Range Options
ERR_RNG[1:0]
1
0
0
1
1
0
0
1
0
1
OPERATION
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
45h
R/W
R/W
REGISTER
Gain Register
B7
-
B6
-
B5
B4
B3
B2
B1
B0
DEFAULT
2Ah
GAIND[1:0]
GAINI[1:0]
GAINP[1:0]
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
0
1
1
0
0
1
0
1
RESPECTIVE GAIN FACTOR
1x
2x
4x (default)
8x
6.25
Fan Spin Up Configuration Register
Table 6.38 Fan Spin Up Configuration Register
ADDR
46h
R/W
R/W
REGISTER
Fan Spin Up
Configuration
B7
B6
B5
NOK
ICK
B4
B3
B2
B1
B0
DEFAULT
19h
DRIVE_FAIL
_CNT [1:0]
SPIN_LVL[2:0]
SPINUP_TIME
[1:0]
The Fan Spin Up Configuration Register controls the settings of Spin Up Routine.
Revision 0.85 (01-29-08)
58
SMSC EMC2103
DATASHEET
SMSC [ SMSC CORPORATION ]
