emc2305 Standard Microsystems Corp., emc2305 Datasheet - Page 40

• Manufacturer Part Number: emc2305
• Description: Multiple Rpm-based Pwm Fan Controller For Five Fans
• Manufacturer: Standard Microsystems Corp.

ADDR
35h
45h
55h
65h
75h
Revision 1.2 (03-22-10)
5.11
R/W
R/W
R/W
R/W
R/W
R/W
GAIND OR GAINP OR GAINI [1:0]
The Gain registers store the gain terms used by the proportional and integral portions of each of the
RPM-based Fan Speed Control Algorithms. 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
Gain Registers
1
0
0
1
1
5.18.
5.18.
5.18.
REGISTER
Register
Register
Register
Register
Register
ERR_RNGX[1:0]
Gain 1
Gain 2
Gain 3
Gain 4
Gain 5
B7
-
-
-
-
-
Table 5.16 Error Range Options
0
0
1
Table 5.17 Gain Registers
Table 5.18 Gain Decode
0
0
1
0
1
B6
DATASHEET
-
-
-
-
-
GAIND1[1:0]
GAIND2[1:0]
GAIND3[1:0]
GAIND4[1:0]
GAIND5[1:0]
40
B5
B4
Multiple RPM-Based PWM Fan Controller for Five Fans
RESPECTIVE GAIN FACTOR
B3
GAINI1[1:0]
GAINI2[1:0]
GAINI3[1:0]
GAINI4[1:0]
GAINI5[1:0]
0 RPM (default)
B2
OPERATION
100 RPM
200 RPM
50 RPM
1x
2x
GAINP1[1:0]
GAINP2[1:0]
GAINP3[1:0]
GAINP4[1:0]
GAINP5[1:0]
B1
B0
SMSC EMC2305
Datasheet
DEFAULT
2Ah
2Ah
2Ah
2Ah
2Ah