F71872
1-0 F2_MODE
R/W
00
00: FAN2 operates in SPEED mode. FANPWM duty-cycle is automatically
adjusted according to FAN EXPECT register.
01: FAN2 operates in TEMPERATURE mode. FANPWM duty-cycle is
automatically adjusted according to current temperature,
1x: FAN2 operates in MANUAL mode. Software set the FANPWM duty-cycle
directly.
7.6.3.38 FANPWM2 START UP DUTY-CYCLE Index 71h
Bit
Name
R/W Default
Description
7-0 F2_START_DUTY
R/W 30h FANPWM2 will increase duty-cycle from 0 to this value directly.
7.6.3.39 FANPWM2 STOP DUTY-CYCLE Index 72h
Bit
Name
R/W Default
R/W
Description
7-0 F2_STOP_DUTY
25h FANPWM2 will decreasing duty-cycle to 0 from this value directly or keep
duty-cycle in this value when F2_KEEP_STOP set to 1.
7.6.3.40 FANPWM2 Output Frequency Control Index 73h
Bit
Name
R/W Default
Description
7
PWM2_DIV[7]
R/W
R/W
80h Set to 1, PRECLK(Pre-Clock) = 48M Hz
;
Set to 0, PRECLK
= 1M Hz .
6-0 PWM2_DIV[6:0]
Pre-divisor of PRECLK.
PRECLK
FANPWM2 output frequency =
(Pre − divisor) ∗ 256
So, PWM frequency ranges from 30.5Hz~187.5KHz
7.6.3.41 FANPWM2 STEP Control Register -- Index 74h
Bit
Name
R/W Default
Description
7-4 F2_UP_STEP
3-0 F2_DOWN_STEP
R/W
R/W
00h This value determines the increasing speed of PWM2_DUTY.
This value determines the decreasing speed of PWM2_DUTY
7.6.3.42 FAN2_FAULT TIME Register Index 75h
Bit
Name
R/W Default
R/W
Description
7-0 F2_FAULT_TIME
03h This register determines the time for fan to chase to the expect speed. Two
conditions cause fan fault event:
(1). When PWM_Duty reaches FFh, if the fan speed count can’t reach the fan
expect count in the time.
(2). When PWM_Duty reaches 00h, if the fan speed count can’t reach the fan
expect count in the time.
The unit of this register is 1 second. The default value is 180 seconds.
80
July, 2007
V0.28P
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
