参数资料
| 型号： | ADT7468ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 40/81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
PROGRAMMING THE AUTOMATIC FAN SPEED CONTROL LOOP
Note that to more efficiently understand the automatic fan speed
control loop, it is strongly recommended to use the ADT7468
evaluation board and software while reading this section.
?
?
5 V voltage monitoring or overtemperature THERM
function?
12 V voltage monitoring or VID5 input?
This section provides the system designer with an understanding
of the automatic fan control loop, and provides step-by-step
guidance for effectively evaluating and selecting critical system
parameters. To optimize the system characteristics, the designer
needs to give some thought to system configuration, including the
The ADT7468 offers multifunctional pins that can be
reconfigured to suit different system requirements and
physical layouts. These multifunction pins are software
programmable.
number of fans, where they are located, and what temperatures are
being measured in the particular system.
2.
How many fans will be supported in system, three or four?
This influences the choice of whether to use the TACH4
pin or to reconfigure it for the THERM function.
The mechanical or thermal engineer who is tasked with the
system thermal characterization should also be involved at the
beginning of the process.
STEP 1: HARDWARE CONFIGURATION
During system design, the motherboard sensing and control
capabilities should be addressed early in the design stages.
Decisions about how these capabilities are used should involve
the system thermal/mechanical engineer. Ask the following
questions:
3.
4.
Is the CPU fan to be controlled using the ADT7468 or will
it run at full speed 100% of the time?
If it runs at 100%, this frees up a PWM output, but the
system is louder.
Where will the ADT7468 be physically located in the
system?
This influences the assignment of the temperature
1.
What ADT7468 functionality will be used?
? PWM2 or SMBALERT?
measurement channels to particular system thermal zones.
For example, locating the ADT7468 close to the VRM
controller circuitry allows the VRM temperature to be
?
TACH4 fan speed measurement or overtemperature
THERM function?
monitored using the local temperature channel.
THERMAL CALIBRATION
100%
PWM
MIN
PWM
CONFIG
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
PWM1
REMOTE 1 =
AMBIENT TEMP
T MIN T RANGE
THERMAL CALIBRATION
0%
100%
PWM
MIN
TACHOMETER 1
MEASUREMENT
PWM
CONFIG
TACH1
CPU FAN SINK
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 2 =
CPU TEMP
Figure 53. Hardware Configuration Example
Rev. 3 | Page 40 of 81 | www.onsemi.com
REAR CHASSIS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7470 | 制造商:AD 制造商全称:Analog Devices 功能描述:Temperature Sensor Hub and Fan Controller |
| ADT7470_13 | 制造商:AD 制造商全称:Analog Devices 功能描述:Temperature Sensor Hub and Fan Controller |
| ADT7470ARQ | 制造商:Analog Devices 功能描述:Temp Sensor Digital Serial (I2C) 16-Pin QSOP |
| ADT7470ARQ-REEL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| ADT7470ARQ-REEL7 | 制造商:Analog Devices 功能描述:Temp Sensor Digital Serial (I2C) 16-Pin QSOP T/R |
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