f75377 Feature Integration Technology Inc., f75377 Datasheet - Page 41

• Manufacturer Part Number: f75377
• Description: Monitor With Automatic Speed Control
• Manufacturer: Feature Integration Technology Inc.

3-0
7-0
7-0
7-0
Bit
Bit
Bit
7.60
7.61
7.62
FAN T0 Control Register 4 – Index D9h
FAN T0 Control Register 5 – Index DAh
FAN T0 Control Register 6 – Index DCh
FAN3_WEIGHT
BOUND1TEMP
BOUND2TEMP
SEC1SPEED
Name
Name
Name
R/W
R/W Default
R/W
R/W Default
R/W
R/W Default
R/W
(100%)
(70’C)
(40’C)
FFh
46h
28h
Fh
Temperature 0 to FAN3 weight setting register:
0: T0 independent with FAN3.
1: Proportion of T0 to FAN3 is 1/15
2: Proportion of T0 to FAN3 is 2/15.
…..
F: Proportion of T0 to FAN3 is 15/15
The 1
When temperature is exceed this boundary, FAN expect value will load
from segment 1 register (index DC)h.
When temperature is below this boundary – hysteresis, FAN expect value
will load from segment 2 register (index DDh).
The 2
When temperature is exceed this boundary, FAN1 expect value will load
from segment 2 register (index DDh).
When temperature is below this boundary – hysteresis, FAN expect value
will load from segment 3 register (index DEh).
The meaning of this register is depending on the FAN_MODE(CR96)
2’b00: The value that set in this byte is the relative expect fan speed % of
the full speed in this temperature section.
Ex:
100%:full speed: User must set this register to 0.
2’b01: The value that set in this byte is mean the expect PWM duty-cycle
in this temperature section.
60% full speed: (100-60)*32/60, so user must program 21 to this reg.
X% full speed: The value programming in this byte is
Expect
st
st
BOUNDARY temperature for T0 in temperature mode.
BOUNDARY temperature for T0 in temperature mode.
41
speed
=



32
+
32
value

× 

Description
Description
Description
Full
speeed
(100-X)*32/X
F75377
March.
V0.12P
, 2008