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| 型号： | ADT7473ARQZ-1 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 温度/湿度传感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 2.50Cel, RECTANGULAR, SURFACE MOUNT |
| 封装： | ROHS COMPLIANT, MO-137AB, QSOP-16 |
| 文件页数： | 49/72页 |
| 文件大小： | 1494K |
| 代理商： | ADT7473ARQZ-1 |
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ADT7473/ADT7473-1
Rev. C | Page 53 of 72
Figure 81 shows the PWM output response for a ramp rate of 2.
In this instance, the fan takes about 17.6 seconds to reach full
running speed.
TIME (s)
140
0
17.6
120
100
80
60
40
20
0
120
100
80
60
40
20
0
0
46
86-
078
RTEMP (°C)
PWM DUTY CYCLE (%)
Figure 81. Enhanced Acoustics Mode with Ramp Rate = 2
Figure 82 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 seconds for the fan to reach full speed.
TIME (s)
0
35
120
100
80
60
40
20
0
140
120
100
80
60
40
20
0
04686-
0
79
RTEMP (°C)
PWM DUTY CYCLE (%)
Figure 82. Enhanced Acoustics Mode with Ramp Rate = 1
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.
90
80
70
60
50
40
0
30
20
10
04686-
080
PWM DUTY CYCLE (%)
RTEMP (°C)
Figure 83. How Fan Reacts to Temperature Variation
in Enhanced Acoustics Mode
Figure 83 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.
Slower Ramp Rates
The ADT7473/ADT7473-1 can be programmed for much
longer ramp times by slowing the ramp rates. Each ramp rate
can be slowed by a factor of 4.
PWM1 Configuration Register (0x5C)
Bit [3] SLOW, 1 slows the ramp rate for PWM1 by 4.
PWM2 Configuration Register (0x5D)
Bit [3] SLOW, 1 slows the ramp rate for PWM2 by 4.
PWM3 Configuration Register (0x5E)
Bit [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 (0x62)
Bits [2:0] ACOU, select the ramp rate for PWM1.
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
Enhanced Acoustics Register 2 (0x63)
Bits [2:0] ACOU3, select the ramp rate for PWM3.
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
Bits [6:4] ACOU2, select the ramp rate for PWM2.
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
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