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參數(shù)資料
| 型號： | ADT7463 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | dB COOL Remote Thermal Controller and Voltage Monitor |
| 中文描述： | 分貝超酷的遠程熱控制器和電壓監(jiān)視器 |
| 文件頁數(shù)： | 43/53頁 |
| 文件大小： | 719K |
| 代理商： | ADT7463 |
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REV. 0
ADT7463
–43–
Table XXIII. PWM Min Duty Cycle Registers
Register Address
0x64
0x65
0x66
Bit
<7:0>
R/W
*
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Description
PWM1 Min Duty Cycle
PWM2 Min Duty Cycle
PWM3 Min Duty Cycle
Description
These bits define the PWM
MIN
duty cycle for PWMx.
0x00 = 0% duty cycle (Fan off)
0x40 = 25% duty cycle
0x80 = 50% duty cycle
0xFF = 100% duty cycle (Fan full speed)
Power-On Default
0x80 (50% duty cycle)
0x80 (50% duty cycle)
0x80 (50% duty cycle)
Name
PWM Duty
Cycle
*
These registers become read-only when the ADT7463 is in Automatic Fan Control Mode.
Table XXIV. T
MIN
Registers
Register Address
0x67
0x68
0x69
R/W
*
Read/Write
Read/Write
Read/Write
Description
Remote 1 Temp T
MIN
Local Temp T
MIN
Remote 2 Temp T
MIN
Power-On Default
0x5A (90 C)
0x5A (90 C)
0x5A (90 C)
These are the T
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 shall have no effect.
Table XXV.
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 C)
0x64 (100 C)
0x64 (100 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 – Hysteresis. If the
THERM
pin is programmed as an output, then
exceeding these limits by 0.25 C can cause the
THERM
pin to assert low as an output.
*
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 XXVI. Temperature Hysteresis Registers
Register Address
0x6D
0x6E
R/W
*
Read/Write
Read/Write
Description
Remote 1, Local Temp Hysteresis
Remote 2 Temp 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
duty cycle until the temperature = T
MIN
– Hysteresis. Up to 158C of hysteresis may be assigned to any temperature
channel. The hysteresis value chosen will also apply to that temperature channel if its
THERM
limit is exceeded. The PWM output being controlled will go to 100% if
the
THERM
limit is exceeded and will remain at 100% until the temperature drops below
THERM
– Hysteresis. For acoustic reasons, it is recommended that the
hysteresis value not be programmed less than 48C. Setting the hysteresis value lower than 48C 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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