NCT6627UD Nuvoton Technology Corporation of America, NCT6627UD Datasheet - Page 55

• Manufacturer Part Number: NCT6627UD
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of NCT6627UD

• Lead Free Status / Rohs Status: Supplier Unconfirmed

7.6.3.2. Fan Speed Cruise
Two pairs of fan input sensors and fan outputs in Fan Speed Cruise
Fan Speed Cruise
speed count (the amount of time between clock input signals, not the number of clock input signals in a period of
time) and an interval (e.g., 160 ± 10). As long as the fan speed count is in the specified range, fan output remains
the same. If the fan speed count is higher than the high end (e.g., 170), fan output increases to make the count
lower. If the fan speed count is lower than the low end (e.g., 150), fan output decreases to make the count higher.
One example is illustrated in this figure.
The following tables show current temperature, fan output value and the relative control registers at Thermal
Cruise
•
•
TM
Current CPU
Temperature
Current SYS
Temperature
Current
CPUFANOUT
Output Value
Current
SYSFANOUT
DESCRIPTION
SYSFANIN and SYSFANOUT
CPUFANIN and CPUFANOUT
and Fan Speed Cruise
TM
mode keeps the fan speed in a specified range. First, this range is defined in BIOS by a fan
Count
Fan
output
170
160
150
TM
Bank1, Index
50h ,51h
Bank0, Index
27h
Bank0, Index
03h
Bank0 Index
01h
REGISTER
ADDRESS
Table 7-6 Display Registers – at S
Mode
Figure 7-12 Mechanism of Fan Speed Cruise
TM
(%)
100
50
mode.
0
A
CPUTIN Temperature
Sensor
SYSTIN Temperature
Sensor
CPUFANOUT Output
Value Select
SYSFANOUT Output
Value Select
REGISTER NAME
C
-46-
MART
W83627UHG/NCT6627UD
TM
Read only
Read only
80h / FFh by
strapping
80h / FFh by
strapping
mode.
F
ATTRIBUTE
AN
Publication Release Date: October 26, 2010
TM
TM
I Mode
Mode
8 MSB, 1°C bit 7,
0.5 °C
8 MSB, 1°C
Bits 7-0
CPUFANOUT Value
Bits 7-0
SYSFANOUT Value
BIT DATA
Revision 1.7