F75386
7.10 FINTEK PWM Control Register Index 31h (Fintek Mode)
Power on default <7:0> = 00h
Bit
Name
Attribute
Description
Set to 0, PWM source clock is 2 MHz.
Set to 1, PWM source clock is 200 kHz.
7
FTK_PWMCLK_SEL
R/W
Set to 0 or 1 makes no different. PWM clock is divided by this value.
PWM clock = PWMOUT source clock/FTK_PREDIV
6-0
FTK_PREDIV
R/W
7.11 PWM Control and Fan Monitor Register Index 4Ah
Power on default <7:0> = 20h
Bit
Name
Attribute
Description
These bits are not used and always set to 0
7-6
Reserved
RO
0: operates in TEMPERATURE mode. PWMOUT duty-cycle is automatically adjusted
according to the T-P (Temperature vs. PWM) lookup table. Look-up table is locked.
1: operates in MANUAL mode. Software set the PWMOUT duty-cycle directly. Look-up
table is programmable.
5
4
PWM_MODE
PWM_INV
R/W
R/W
0: PWM output will be 0 V to turn off FAN and open (High-Z) to turn on fan.
1: PWM output will be open to turn off FAN and 0 V to turn on fan.
1: PWMOUT frequency source is 333 kHz.
3
2
PWM_CLK_SEL
Reserved
R/W
R/W
0: PWMOUT frequency source is 1.4 kHz.
This bit is not used and always set to 0
00: Traditional Tachometer Input Mode
01: Improved Traditional Tachometer Input Mode
1-0
Tachometer Mode
R/W
10: Most Accurate Mode
11: Least Effort Mode
Note: If the PWM Clock is 333 kHz, Traditional Tachometer Input Mode is always used.
7.12 Fan Spin-Up Configuration Register Index 4Bh
Power on default<7:0> = 3Fh
-14-
F75386
July, 2007
V0.27P
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
