参数资料
型号: ADT7490ARQZ-R7
厂商: ON Semiconductor
文件页数: 36/75页
文件大小: 0K
描述: IC THERM MON FAN CTLR 24-QSOP
产品变化通告: MFG CHG Notification ADI to ON Semi
QSOP 24ld Pkg (MSL) Change 17/Jun/2010
Product Discontinuation 30/Sept/2011
标准包装: 1,000
系列: dBCool®
功能: 风扇控制,温度监控器
传感器类型: 内部和外部
感应温度: -40°C ~ 125°C
精确度: ±1.5°C(最小值)
拓扑: ADC,比较器,风扇速度计数器,多路复用器,寄存器库
输出类型: SMBus?
输出警报:
输出风扇:
电源电压: 3 V ~ 3.6 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 24-SSOP(0.154",3.90mm 宽)
供应商设备封装: 24-QSOP
包装: 带卷 (TR)
ADT7490
100%
0%
T MIN
THERMAL CALIBRATION
100%
PWM
MIN
PWM
CONFIG
RAMP
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM1
REMOTE2 =
CPU TEMP
T MIN T RANGE
THERMAL CALIBRATION
0%
100%
PWM
MIN
TACHOMETER1
MEASUREMENT
PWM
CONFIG
RAMP
TACH1
CPU FAN SINK
MUX
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM2
T MIN
T RANGE
0%
PWM
TACHOMETER2
MEASUREMENT
TACH2
LOCAL =
VRM TEMP
THERMAL CALIBRATION
100%
MIN
PWM
CONFIG
RAMP
FRONT CHASSIS
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM3
T MIN
T RANGE
0%
TACHOMETER3
AND 4
MEASUREMENT
TACH3
REMOTE1 =
AMBIENT TEMP
Figure 49. Understanding the T MIN Parameter
REAR CHASSIS
Step 4: PWM MIN for Each PWM (Fan) Output
PWM MIN is the minimum PWM duty cycle at which each
fan in the system runs. It is also the start speed for each fan
under automatic fan control once the temperature rises
above T MIN . For maximum system acoustic benefit,
PWM MIN should be as low as possible. Depending on the
fan used, the PWM MIN setting is usually in the 20% to 33%
duty cycle range. This value can be found through fan
validation.
100%
PWM MIN
0%
More than one PWM output can be controlled from a
single temperature measurement channel. For example,
Remote 1 temperature can control PWM1 and PWM2
outputs. If two different fans are used on PWM1 and PWM2,
the fan characteristics can be set up differently. As a result,
Fan 1 driven by PWM1 can have a different PWM MIN value
than that of Fan 2 connected to PWM2. Figure 51 illustrates
this as PWM1 MIN (front fan) turned on at a minimum duty
cycle of 20%, while PWM2 MIN (rear fan) is turned on at a
minimum of 40% duty cycle. Note that both fans turn on at
exactly the same temperature, defined by T MIN .
T MIN
TEMPERATURE
Figure 50. PWM MIN Determines Minimum
PWM Duty Cycle
http://onsemi.com
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