參數(shù)資料
型號: AMD1027
廠商: Analog Devices, Inc.
英文描述: dBCOOL Remote Thermal Controller and Voltage Monitor
中文描述: dBCOOL遠程熱控制器和電壓監(jiān)視器
文件頁數(shù): 35/56頁
文件大?。?/td> 1072K
代理商: AMD1027
REV. A
ADM1027
–35–
Step 7
Determine T
HYST
for Each Temperature Channel
T
HYST
is the amount of extra cooling a fan provides after the
measured temperature has dropped back below T
MIN
before the
fan turns off. The premise for temperature hysteresis (T
HYST
)
is that without it, the fan would merely chatter, or cycle on and
off regularly, whenever the temperature is hovering about the
T
MIN
setting.
The T
HYST
value chosen will determine the amount of time
needed for the system to cool down or heat up, as the fan is
turning on and off. Values of hysteresis are programmable in
the range 1
C to 15
C. Larger values of T
HYST
prevent the fans
chattering on and off as previously described. The T
HYST
default
value is 4
C.
Hysteresis Registers
Reg. 0x6D Remote 1, Local Hysteresis Register
<7:4> = Remote 1 temperature hysteresis (default = 4
C)
<3:0> = Local temperature hysteresis (default = 4
C)
Reg. 0x6E Remote 2 Temperature Hysteresis Register
<7:4> = Remote 2 temperature hysteresis (default = 4
C)
Note that in some applications it is required that the fans not
turn off below T
MIN
, but remain running at PWM
MIN
. Bits <7:5>
of Enhance Acoustics Register 1 (Reg. 0x62) allow the fans to
be turned off or kept spinning below T
MIN
. If the fans are always
on, the T
HYST
value has no effect on the fan when the tempera-
ture drops below T
MIN
.
Enhance Acoustics Register 1 (Reg. 0x62)
Bit 7 (MIN3) = 0,
PWM3 is OFF (0% PWM duty cycle) when
temperature is below T
MIN
– T
HYST
.
Bit 7 (MIN3) = 1,
PWM3 runs at PWM3 minimum duty cycle
below T
MIN
– T
HYST
.
Bit 6 (MIN2) = 0,
PWM2 is OFF (0% PWM duty cycle) when
temperature is below T
MIN
– T
HYST
.
Bit 6 (MIN2) = 1,
PWM2 runs at PWM2 minimum duty cycle
below T
MIN
– T
HYST
.
Bit 5 (MIN1) = 0,
PWM1 is OFF (0% PWM duty cycle) when
temperature is below T
MIN
– T
HYST
.
Bit 5 (MIN1) = 1,
PWM1 runs at PWM1 minimum duty cycle
below T
MIN
– T
HYST
.
P
0%
100%
T
RANGE
T
HYST
T
MIN
T
THERM
TACHOMETER 1
CRAMP
ENHANCEMENT)
TACHOMETER 2
MEASUREMENT
CRAMP
ENHANCEMENT)
TACHOMETERS 3
MEAAND 4
GEPWM
GEPWM
CRAMP
ENHANCEMENT)
GEPWM
PWM
CONFIG
MIN
MUX
THERMAL CALIBRATION
100%
0%
T
MIN
T
RANGE
THERMAL CALIBRATION
100%
0%
T
MIN
T
RANGE
THERMAL CALIBRATION
100%
0%
T
MIN
T
RANGE
MIN
PWM
MIN
PWM
CONFIG
CPWM
REMOTE 1 =
AMBIENT TEMP
LOCAL =
VRM TEMP
REMOTE 2 =
CPU TEMP
PWM1
TACH1
CPU
FANSINK
FRONT
CHASSIS
REAR
CHASSIS
PWM3
TACH3
PWM2
TACH2
Figure 36. The T
HYST
Value Applies to Fan On/Off Hysteresis and THERM Hysteresis
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