F81866A
This selects the weighting of the difference between Ta and Tb if Ta is
lower than Tb.
3’h1: 1 (Ct = 1)
TFAN1_ADJ_DN
_RATE
3’h2: 1/2 (Ct= 1/2)
2-0
R/W 5VSB
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
-
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
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.
5-4
FAN3_MODE
R/W VBAT
01
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
0xB2-0xB3, and F81866A will adjust duty cycle (PWM fan type) or voltage
(linear fan type) to control fan speed automatically.
3-2
FAN2_MODE
R/W VBAT
01
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
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
