参数资料
| 型号： | ADT7467BBZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 48/72页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADT7467 |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 1 |
| 系列： | dBCool® |
| 传感器类型： | 温度 |
| 传感范围： | -40°C ~ 120°C |
| 接口： | SMBus（2 线/I²C） |
| 灵敏度： | ±1.5°C |
| 电源电压： | 3 V ~ 5.5 V |
| 嵌入式： | 否 |
| 已供物品： | 板，缆线，CD |
| 已用 IC / 零件： | ADT7467 |
| 其它名称： | EVAL-ADT7467EBZ EVAL-ADT7467EBZ-ND |
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ADT7467
Enabling Dynamic T MIN Control Mode
Bits <7:5> of the dynamic T MIN control Register 1 (0x36)
enable/disable dynamic T MIN control on the temperature
channels.
Table 41. DYNAMIC T MIN CONTROL REGISTER 1
(REG. 0X36)
Bit Mnemonic Description
Enhanced Acoustics Register 2 (0x63)
<2:0> ACOU3 selects the ramp rate for PWM3.
000 = 1 time slot = 35 sec
001 = 2 time slots = 17.6 sec
010 = 3 time slots = 11.8 sec
011 = 5 time slots = 7 sec
100 = 8 time slots = 4.4 sec
101 = 12 time slots = 3 sec
<5>
<6>
<7>
R1T
LT
R2T
1 enables dynamic T MIN control on the
Remote 1 temperature channel. The
chosen T MIN value is dynamically
adjusted based on the current
temperature, operating point, and high
and low limits for this zone.
0 disables dynamic T MIN control. The
T MIN value chosen is not adjusted, and
the channel behaves as described in
the Automatic Fan Control Overview
section.
1 enables dynamic T MIN control on the
local temperature channel. The chosen
T MIN value is dynamically adjusted
based on the current temperature,
operating point, and high and low limits
for this zone.
0 disables dynamic T MIN control. The
T MIN value chosen is not adjusted, and
the channel behaves as described in
the Enhancing System Acoustics
section.
1 enables the dynamic T MIN control on
the Remote 2 temperature channel.
The chosen T MIN value is dynamically
adjusted based on the current
temperature, operating point, and high
and low limits for this zone.
110 = 24 time slots = 1.6 sec
111 = 48 time slots = 0.8 sec
<6:4> ACOU2 selects the ramp rate for PWM2.
000 = 1 time slot = 35 sec
001 = 2 time slots = 17.6 sec
010 = 3 time slots = 11.8 sec
011 = 5 time slots = 7 sec
100 = 8 time slots = 4.4 sec
101 = 12 time slots = 3 sec
110 = 24 time slots = 1.6 sec
111 = 48 time slots = 0.8 sec
Another way to view the ramp rates is as the time it takes
for the PWM output to ramp up from 0% to 100% duty cycle
for an instantaneous change in temperature. This can be
tested by putting the ADT7467 into manual mode and
changing the PWM output from 0% to 100% PWM duty
cycle. The PWM output takes 35 sec to reach 100% when a
ramp rate of 1 time slot is selected.
Figure 75 shows remote temperature plotted against
PWM duty cycle for enhanced acoustics mode. The ramp
rate is set to 48, which corresponds to the fastest ramp rate.
Assume that a new temperature reading is available every
R2T = 0 disables dynamic T MIN control. The T MIN value
chosen is not adjusted, and the channel behaves as described
in the Enhancing System Acoustics section.
115 ms. With these settings, it takes approximately 0.76 sec
to go from 33% duty cycle to 100% duty cycle (full speed).
Even though the temperature increases very rapidly, the fan
ramps up to full speed gradually.
Step 12: Ramp Rate for Acoustic Enhancement
The optimal ramp rate for acoustic enhancement can be
determined through system characterization after
completing the thermal optimization. If possible, the effect
of each ramp rate should be logged to determine the best
setting for a given solution.
Enhanced Acoustics Register 1 (0x62)
<2:0> ACOU selects the ramp rate for PWM1.
000 = 1 time slot = 35 sec
001 = 2 time slots = 17.6 sec
010 = 3 time slots = 11.8 sec
140
120
100
80
60
40
20
R TEMP ( ? C)
PWM DUTY CYCLE (%)
120
100
80
60
40
20
TIME (s)
011 = 5 time slots = 7 sec
100 = 8 time slots = 4.4 sec
101 = 12 time slots = 3 sec
110 = 24 time slots = 1.6 sec
111 = 48 time slots = 0.8 sec
0 0
0 0.76
Figure 75. Enhanced Acoustics Mode with Ramp
Rate = 48
Figure 76 shows how a ramp rate of 8 affects the control
loop. The overall response of the fan is slower than it is with
a ramp rate of 48. Because the ramp rate is reduced, it takes
longer for the fan to achieve full running speed. In this case,
it takes approximately 4.4 sec for the fan to reach full speed.
http://onsemi.com
48
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