EMC2301 Standard Microsystems Corp., EMC2301 Datasheet - Page 32

• Manufacturer Part Number: EMC2301
• Description: Rpm-based Pwm Fan Controller
• Manufacturer: Standard Microsystems Corp.

ADDR
36h
ADDR
35h
Revision 1.2 (03-22-10)
5.11
5.12
R/W
R/W
R/W
R/W
GAIND OR GAINP OR GAINI [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 gain terms are used as the KD, KI, and KP gain terms in
a classic PID control solution.
Bits 5 - 4 - GAINDX[1:0] - Controls the derivative gain term used by the FSC algorithm as shown in
Table
Bits 3-2 - GAINIX[1:0] - Controls the integral gain term used by the FSC algorithm as shown in
Table
Bits 1-0 - GAINP[1:0] - Controls the proportional gain term used by the FSC algorithm as shown in
Table
1
0
0
1
1
The Fan Spin Up Configuration register controls the settings of Spin Up Routine. The Fan Spin Up
Configuration register is software locked.
Gain Register
Fan Spin Up Configuration Register
1
1
Configuration
Fan Spin Up
REGISTER
5.18.
5.18.
5.18.
Gain Register
REGISTER
ERR_RNG[1:0]
Table 5.19 Fan Spin Up Configuration Register
Table 5.16 Error Range Options (continued)
DRIVE_FAIL_
B7
CNT [1:0]
B7
-
0
0
1
0
1
Table 5.17 Gain Register
B6
Table 5.18 Gain Decode
0
1
B6
DATASHEET
-
NOKICK
B5
32
B5
GAIND[1:0]
B4
B4
SPIN_LVL[2:0]
RESPECTIVE GAIN FACTOR
B3
GAINI[1:0]
B3
4x (default)
B2
OPERATION
B2
200 RPM
1x
2x
8x
RPM-Based PWM Fan Controller
B1
GAINP[1:0]
SPINUP_TIME
B1
[1:0]
B0
SMSC EMC2301
B0
Datasheet
DEFAULT
2Ah
DEFAULT
19h