参数资料
| 型号： | ADT7468ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 51/81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
T RANGE
100%
0%
T MIN
T THERM
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 68. How T THERM Relates to Automatic Fan Control
STEP 8: T HYST FOR TEMPERATURE CHANNELS
T HYST is the amount of extra cooling a fan provides after the
temperature measured 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 temperature is hovering at about the T MIN
setting.
The T HYST value chosen determines 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 from chattering
on and off. The T HYST default value is set at 4°C.
The T HYST setting applies not only to the temperature hysteresis
for fan on/off, but the same setting is used for the T THERM
Hysteresis Registers
Reg. 0x6D, Remote 1, local hysteresis register
<7:4>, Remote 1 temperature hysteresis (4°C default).
<3:0>, local temperature hysteresis (4°C default).
Reg. 0x6E, Remote 2 temperature hysteresis register
<7:4>, Remote 2 temperature hysteresis (4°C default).
In some applications, it is required that fans not turn off below
T MIN , but remain running at PWM MIN . Bits <7:5> of Enhanced
Acoustics Register 1 (Reg. 0x62) allow the fans to be turned off
or to be kept spinning below T MIN . If the fans are always on, the
T HYST value has no effect on the fan when the temperature drops
below T MIN .
hysteresis value, described in Step 6. Therefore, programming
Registers 0x6D and 0x6E sets the hysteresis for both fan on/off
and the THERM function.
Rev. 3 | Page 51 of 81 | www.onsemi.com
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相关代理商/技术参数 |
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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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