F81867 Datasheet, PDF (38/315 Pages) Feature Integration Technology Inc. – 6 UARTs μSuper IO With 128 Bytes FIFO and Power Saving Functions

F81867
Fan speed control mechanism
There are some modes to control fan speed and they are 1.Manual mode, 2. Auto mode (Stage
& Linear). More detail, please refer to the description of registers & below figure.
Start
Step1: Select FAN_TYPE
(CR94)
DAC (linear)
PWM
Step2 :Select FAN_MODE
CR96 [5:4] Fan3
CR96 [3:2] Fan2
CR96 [1:0] Fan1
Auto Mode
RPM
Duty
Step3: Set temp. follows
FAN1 :CRAF
FAN2 :CRBF
FAN3 :CRCF
Step3: Set temp. follows
FAN1 :CRAF
FAN2 :CRBF
FAN3 :CRCF
Manual Mode
RPM
Step3: Set RPM
FAN1 :CR A2,A3
FAN2 :CR B2,B3
FAN3 :CR C2,C3
Duty
Step3: Set Duty
FAN1 :CR,A3
FAN2 :CR B3
FAN3 :CR C3
Step4: Set H/W Monitor
Fan1 – (BOUNDARY :CR A6~A9)
(SPEED : CR AA ~ AE)
Fan2 –(BOUNDARY :CR B6~B9)
(SPEED : CR BA ~ BE)
Fan3 –(BOUNDARY :CR C6~C9)
(SPEED : CR CA ~ CE)
Step4: Set H/W Monitor
Fan1 – (BOUNDARY :CR A6~A9)
(SPEED : CR AA ~ AE)
Fan2 –(BOUNDARY :CR B6~B9)
(SPEED : CR BA ~ BE)
Fan3 –(BOUNDARY :CR C6~C9)
(SPEED : CR CA ~ CE)
Fig 7-7 Fan type & mode selection flow
Each fan can be controlled by 8 kinds of temperature inputs: (1) T1 temperature (2)
T2 temperature (3) T3 temperature (4) PECI temperature (5) 4 suits I2C master
temperature.
FAN 1
FAN_PROG_SEL
FAN Type Select
FAN mode Select
FAN count reading
FAN expect speed
FAN full speed count
BOUNDARY
SEGMENT SPEED
Related Register
Index 9Fh [7]
Index 94 [1:0]
Index 96 [1:0]
Index A0h~A1h
Index A2h~A3h
Index A4h~A5h
Index A6h~A9h
Index AAh~AEh
38
Dec, 2011
V0.12P