参数资料
| 型号： | ADT7468ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 58/81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
Figure 80 shows how the control loop reacts to temperature
with the slowest ramp rate. The ramp rate is set to 1, while all
other control parameters remain the same. With the slowest
ramp rate selected, it takes 35 sec for the fan to reach full speed.
Slower Ramp Rates
The ADT7468 can be programmed for much longer ramp times
by slowing the ramp rates. Each ramp rate can be slowed by a
factor of 4.
120
140
PWM1 Configuration Register (Reg. 0x5C)
100
80
60
40
20
R TEMP (°C)
PWM DUTY CYCLE (%)
120
100
80
60
40
20
<3> slow, 1 slows the ramp rate for PWM1 by 4.
PWM2 Configuration Register (Reg. 0x5D)
<3> slow, 1 slows the ramp rate for PWM2 by 4.
PWM3 Configuration Register (Reg. 0x5E)
<3> slow, 1 slows the ramp rate for PWM3 by 4.
The following sections list the ramp-up times when the slow bit
is set for each PWM output.
Enhanced Acoustics Register 1 (Reg. 0x62)
0
0
TIME (s)
35
0
<2:0> ACOU, selects the ramp rate for PWM1.
000 = 140 sec
Figure 80. Enhanced Acoustics Mode with Ramp Rate = 1
As Figure 77 to Figure 80 show, the rate at which the fan reacts
to temperature change is dependent on the ramp rate selected in
the enhanced acoustics registers. The higher the ramp rate, the
faster the fan reaches the newly calculated fan speed.
Figure 81 shows the behavior of the PWM output as tempera-
ture varies. As the temperature increases, the fan speed ramps
up. Small drops in temperature do not affect the ramp-up
function, because the newly calculated fan speed is still higher
than the previous PWM value. Enhanced acoustics mode allows
the PWM output to be made less sensitive to temperature
variations. This is dependent on the ramp rate selected and
programmed into the enhanced acoustics registers.
90
80
001 = 70.4 sec
010 = 47.2 sec
011 = 28 sec
100 = 17.6 sec
101 = 12 sec
110 = 6.4 sec
111 = 3.2 sec
Enhance Acoustics Register 2 (Reg. 0x63)
<2:0> ACOU3, selects the ramp rate for PWM3.
000 = 140 sec
001 = 70.4 sec
010 = 47.2 sec
011 = 28 sec
100 = 17.6 sec
70
60
50
40
PWM DUTY CYCLE (%)
R TEMP (°C)
101 = 12 sec
110 = 6.4 sec
111 = 3.2 sec
<6:4> ACOU2, selects the ramp rate for PWM2.
30
20
10
0
Figure 81. How Fan Reacts to Temperature Variation
in Enhanced Acoustics Mode
000 = 140 sec
001 = 70.4 sec
010 = 47.2 sec
011 = 28 sec
100 = 17.6 sec
101 = 12 sec
110 = 6.4 sec
111 = 3.2 sec
Rev. 3 | Page 58 of 81 | www.onsemi.com
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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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