F81866A Datasheet, PDF (68/210 Pages) Feature Integration Technology Inc. – 6 UARTs Super IO With 128 Bytes FIFO and Power

TFAN1_ADJ_DN
2-0
_RATE
F81866A
R/W 5VSB
This selects the weighting of the difference between Ta and Tb if Ta is
lower than Tb.
3’h1: 1 (Ct = 1)
3’h2: 1/2 (Ct= 1/2)
3’h0
3’h3: 1/4 (Ct = 1/4)
3’h4: 1/8 (Ct = 1/8)
otherwise: 0
To access this byte, FAN_PROG_SEL must set to “1”.
FAN mode Select Register ⎯ Index 96h (FAN_PROG_SEL = 0)
Bit
Name
R/W Reset Default
Description
7-6
Reserved
-
-
- Reserved
5-4 FAN3_MODE
R/W VBAT
00: Auto fan speed control. Fan speed will follow different temperature by
different RPM defined in 0xC6-0xCE.
01: Auto fan speed control. Fan speed will follow different temperature by
different duty cycle defined in 0xC6-0xCE.
10: Manual mode fan control. User can write expected RPM count to
01
0xC2-0xC3, and F81866A will adjust duty cycle (PWM fan type) or
voltage (linear fan type) to control fan speed automatically.
11: Manual mode fan control. User can write expected duty cycle (PWM
fan type) or voltage (linear fan type) to 0xC3, and F81866A will output this
desired duty or voltage to control fan speed.
3-2 FAN2_MODE
R/W VBAT
00: Auto fan speed control. Fan speed will follow different temperature by
different RPM defined in 0xB6-0xBE.
01: Auto fan speed control. Fan speed will follow different temperature by
different duty cycle (voltage) defined in 0xB6-0xBE.
10: Manual mode fan control. User can write expected RPM count to
01
0xB2-0xB3, and F81866A will adjust duty cycle (PWM fan type) or voltage
(linear fan type) to control fan speed automatically.
11: Manual mode fan control, user can write expected duty cycle (PWM
fan type) or voltage (linear fan type) to 0xB3, and F81866A will output this
desired duty or voltage to control fan speed.
68
Jan, 2012
V0. 12P