参数资料
| 型号： | ADT7468ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 53/81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
THERMAL CALIBRATION
100%
OPERATING
PWM
MIN
RAMP
PWM
CONFIG
POINT
CONTROL
(ACOUSTIC
PWM
GENERATOR
PWM1
ENHANCEMENT)
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 70. Operating Point Value Dynamically Adjusts Automatic Fan Control Settings
STEP 10: HIGH AND LOW LIMITS FOR
TEMPERATURE CHANNELS
How Dynamic T MIN Control Works
The basic premise is as follows:
The low limit defines the temperature at which the T MIN value
starts to be increased, if temperature falls below this value. This
has the net effect of reducing the fan speed, allowing the system
to get hotter. An interrupt can be generated when the tempera-
ture drops below the low limit.
1.
Set the target temperature for the temperature zone, which
could be, for example, the Remote 1 thermal diode. This
value is programmed to the Remote 1 operating
temperature register.
The high limit defines the temperature at which the T MIN value
starts to be reduced, if temperature increases above this value.
This has the net effect of increasing fan speed to cool down the
2.
As the temperature in that zone (Remote 1 temperature)
rises toward and exceeds the operating point temperature,
T MIN is reduced and the fan speed increases.
system. An interrupt can be generated when the temperature
3.
As the temperature drops below the operating point
rises above the high limit.
Programming High and Low Limits
There are six limit registers; a high limit and low limit are
associated with each temperature channel. These 8-bit registers
allow the high and low limit temperatures to be programmed
with 1°C resolution.
Temperature Limit Registers
Reg. 0x4E, Remote 1 temperature low limit = 0x01
Reg. 0x4F, Remote 1 temperature high limit = 0x7F
Reg. 0x50, Local temperature low limit = 0x01
Reg. 0x51, Local temperature high limit = 0x7F
Reg. 0x52, Remote 2 temperature low limit = 0x01
Reg. 0x53, Remote 2 temperature high limit = 0x7F
temperature, T MIN is increased and the fan speed is
reduced.
However, the loop operation is not as simple as described in
these steps. A number of conditions govern the situations in
which T MIN can increase or decrease.
Short Cycle and Long Cycle
The ADT7468 implements two loops: a short cycle and a long
cycle. The short cycle takes place every n monitoring cycles.
The long cycle takes place every 2 n monitoring cycles. The
value of n is programmable for each temperature channel. The
bits are located at the following register locations:
Remote 1 = CYR1 = Bits <2:0> of calibration control Register 2
(Address = 0x37).
Rev. 3 | Page 53 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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