参数资料
| 型号： | ADT7468ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 45/81页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADT7468 |
| 标准包装： | 1 |
| 其它名称： | EVAL-ADT7468EB EVAL-ADT7468EB-ND |
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ADT7468
STEP 3: T MIN SETTINGS FOR THERMAL
CALIBRATION CHANNELS
T MIN is the temperature at which the fans start to turn on under
automatic fan control. The speed at which the fan runs at T MIN is
programmed later. The T MIN values chosen are temperature
channel specific, for example, 25°C for ambient channel, 30°C
for VRM temperature, and 40°C for processor temperature.
T MIN is an 8-bit value, either twos complement or Offset 64, that
can be programmed in 1°C increments. There is a T MIN register
associated with each temperature measurement channel:
Remote 1 local, and Remote 2 temperature. Once the T MIN value
is exceeded, the fan turns on and runs at the minimum PWM
duty cycle. The fan turns off once the temperature has dropped
below T MIN – T HYST .
To overcome fan inertia, the fan is spun up until two valid
TACH rising edges are counted. See the Fan Start-Up Timeout
section for more details. In some cases, primarily for psycho-
acoustic reasons, it is desirable that the fan never switch off
below T MIN . Bits <7:5> of Enhanced Acoustics Register 1
(Reg. 0x62), when set, keep the fans running at the PWM
minimum duty cycle, if the temperature should fall below T MIN .
100%
0%
T MIN
T MIN Registers
Reg. 0x67, Remote 1 temperature T MIN = 0x9A (90°C)
Reg. 0x68, Local temperature T MIN = 0x9A (90°C)
Reg. 0x69, Remote 2 temperature T MIN = 0x9A (90°C)
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 .
THERMAL CALIBRATION
100%
PWM
MIN
PWM
CONFIG
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
PWM1
REMOTE 2 =
T MIN T RANGE
THERMAL CALIBRATION
0%
100%
PWM
MIN
TACHOMETER 1
MEASUREMENT
PWM
CONFIG
TACH1
CPU FAN SINK
CPU TEMP
RAMP
MUX
CONTROL
(ACOUSTIC
PWM
GENERATOR
PWM2
ENHANCEMENT)
T MIN
T RANGE
0%
PWM
TACHOMETER 2
MEASUREMENT
PWM
TACH2
LOCAL =
VRM TEMP
THERMAL CALIBRATION
100%
MIN
RAMP
CONFIG
FRONT CHASSIS
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
PWM3
T MIN
T RANGE
0%
TACHOMETER 3
AND 4
MEASUREMENT
TACH3
REMOTE 1 =
AMBIENT TEMP
REAR CHASSIS
Figure 58. Understanding the T MIN Parameter
Rev. 3 | Page 45 of 81 | www.onsemi.com
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| ADT7470 | 制造商:AD 制造商全称:Analog Devices 功能描述:Temperature Sensor Hub and Fan Controller |
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