参数资料
型号: ADT7468ARQ
厂商: ON Semiconductor
文件页数: 58/81页
文件大小: 0K
描述: IC REMOTE THERMAL CTRLR 24-QSOP
产品变化通告: MFG CHG Notification ADI to ON Semi
Product Obsolescence 11/Feb/2009
标准包装: 56
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 ~ 120°C,外部传感器
精确度: ±2°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 ~ 5.5 V
工作温度: -40°C ~ 120°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: 管件
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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