參數(shù)資料
型號(hào)： AMD1027
廠商： Analog Devices, Inc.
英文描述： dBCOOL Remote Thermal Controller and Voltage Monitor
中文描述： dBCOOL遠(yuǎn)程熱控制器和電壓監(jiān)視器
文件頁數(shù)： 50/56頁
文件大小： 1072K
代理商： AMD1027
REV. A
–50–
ADM1027
Table XX. PWM Minimum Duty Cycle Registers
Register Address
0x64
0x65
0x66
R/W
Read/Write
Read/Write
Read/Write
Description
PWM1 Minimum Duty Cycle
PWM2 Minimum Duty Cycle
PWM3 Minimum Duty Cycle
Power-On Default
0x80 (50% duty cycle)
0x80 (50% duty cycle)
0x80 (50% duty cycle)
Bit
<7:0>
Name
PWM Duty
Read/Write
Read/Write
Description
These bits define the PWM
MIN
duty cycle for the PWMx output.
0x00 = 0% duty cycle (fan off)
0x40 = 25% duty cycle
0x80 = 50% duty cycle
0xFF = 100% duty cycle (fan full speed)
These registers become read-only when the ADM1027 is in automatic fan control mode.
Table XXI. T
MIN
Registers
Register Address
0x67
0x68
0x69
R/W
Read/Write
Read/Write
Read/Write
Description
Remote 1 Temperature T
MIN
Local Temperature T
MIN
Remote 2 Temperature T
MIN
Power-On Default
0x5A (90
o
C)
0x5A (90
o
C)
0x5A (90
o
C)
These are the T
MIN
registers for each temperature channel. When the temperature measured exceeds T
MIN
, the appropriate fan will
run at minimum speed and increase with temperature according to T
RANGE
.
These registers become read-only when the Configuration Register 1 lock bit is set. Any further attempts to write to these registers
will have no effect.
Table XXII. Therm Limit Registers
Register Address
0x6A
0x6B
0x6C
R/W
Read/Write
Read/Write
Read/Write
Description
Remote 1 THERM Limit
Local THERM Limit
Remote 2 THERM Limit
Power-On Default
0x64 (100
o
C)
0x64 (100
o
C)
0x64 (100
o
C)
If any temperature measured exceeds its THERM limit, all PWM outputs will drive their fans at 100% duty cycle. This is a fail-safe
mechanism incorporated to cool the system in the event of a critical overtemperature. It also ensures some level of cooling in the
event that software or hardware locks up. If set to 0x80, this feature is disabled. The PWM output will remain at 100% until the
temperature drops below THERM limit – 4
∞
C .
These registers become read-only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to these registers
will have no effect.
Table XXIII. Temperature Hysteresis Registers
Register Address
0x6D
0x6E
R/W
Read/Write
Read/Write
Description
Remote 1, Local Temperature Hysteresis
Remote 2 Temperature Hysteresis
Power-On Default
0x44
0x40
Each 4-bit value controls the amount of temperature hysteresis applied to a particular temperature channel. Once the temperature for
that channel falls below its T
MIN
value, the fan will remain running at PWM
MIN
duty cycle until the temperature = T
MIN
– hysteresis.
Up to 15
o
C of hysteresis may be assigned to any temperature channel. Setting the hysteresis value lower than 4
o
C will cause the fan
to switch on and off regularly when the temperature is close to T
MIN
.
These registers become read-only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to these registers
will have no effect.
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