参数资料
型号: ADM1031ARQ-REEL
厂商: ON Semiconductor
文件页数: 13/32页
文件大小: 0K
描述: IC SENSOR 2-TEMP/FAN CTRL 16QSOP
产品变化通告: MFG CHG Notification ADI to ON Semi
LTB Notification
标准包装: 2,500
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: 0°C ~ 100°C,外部传感器
精确度: ±1°C 本地,±0.5°C 远程
拓扑: ADC,比较器,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 ~ 5.5 V
工作温度: 0°C ~ 100°C
安装类型: 表面贴装
封装/外壳: 16-SSOP(0.154",3.90mm 宽)
供应商设备封装: 16-QSOP
包装: 带卷 (TR)
ADM1031
How Does the Control Loop Work?
The automatic fan speed control loop is shown in
Figure 21.
100
93
MAX
SPIN-UP FOR 2 SECONDS
87
80
73
66
60
53
T RANGE = 5 ? C
T RANGE = 10 ? C
MIN
47
40
33
0 5 10
20
40
T RANGE = 20 ? C
T RANGE = 40 ? C
T RANGE = 80 ? C
60 80
T MIN
T MAX = T MIN + T RANGE
TEMPERATURE ( ? C)
T RANGE = 40 ? C
T MIN T MAX = T MIN + T RANGE
TEMPERATURE
Figure 21. Automatic Fan Speed Control Loop
T MIN is the temperature at which the fan should switch on
and run at minimum speed. The fan only turns on once the
temperature being measured rises above the T MIN value
programmed. The fan spins up for a predetermined time
(default = 2 seconds). See the Fan Spin-Up section for more
details.
T RANGE is the temperature range over which the
ADM1031 automatically adjusts the fan speed. As the
temperature increases beyond T MIN , the PWM_OUT duty
cycle increases accordingly. The T RANGE parameter
actually defines the fan speed vs. temperature slope of the
control loop.
T MAX is the temperature at which the fan is at its
maximum speed. At this temperature, the PWM duty cycle
driving the fan is 100%. T MAX is given by T MIN + T RANGE .
Since this parameter is the sum of the T MIN and T RANGE
parameters, it does not need to be programmed into a register
on-chip.
A hysteresis value of 5 ? C is included in the control loop
to prevent the fan continuously switching on and off if the
temperature is close to T MIN . The fan continues to run until
the temperature drops 5 ? C below T MIN .
Figure 22 shows the different control slopes determined
by the T RANGE value chosen, and programmed into the
ADM1031. T MIN is set to 0 ? C to start all slopes from the
same point. The figure shows how changing the T RANGE
value affects the PWM duty cycle vs. temperature slope.
Figure 22. PWM Duty Cycle vs. Temperature Slope
(T RANGE )
Figure 23 shows how, for a given T RANGE , changing the
T MIN value affects the loop. Increasing the T MIN value
increases the T MAX (temperature at which the fan runs full
speed) value, since T MAX = T MIN + T RANGE . Note, however,
that the PWM duty cycle vs. temperature slope remains
exactly the same. Changing the T MIN value merely shifts the
control slope. The T MIN can be changed in increments of 4 ? C.
100
93
87
80
73
66
60
53
47
40
33
0 20 40 60 80
°
T MIN T MAX = T MIN + T RANGE
TEMPERATURE ( ? C)
Figure 23. Effect of Increasing T MIN Value on
Control Loop
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