參數(shù)資料
型號: ADT7476ARQZ-REEL7
廠商: ANALOG DEVICES INC
元件分類: 溫度/濕度傳感器
英文描述: DIGITAL TEMP SENSOR-SERIAL, 10BIT(s), 2.50Cel, RECTANGULAR, SURFACE MOUNT
封裝: ROHS COMPLIANT, MO-137AE, QSOP-24
文件頁數(shù): 41/72頁
文件大小: 5219K
代理商: ADT7476ARQZ-REEL7
ADT7476
Rev. B | Page 46 of 72
STEP 6: TRANGE FOR TEMPERATURE CHANNELS
TRANGE is the range of temperature over which automatic fan
control occurs once the programmed TMIN temperature has
been exceeded. TRANGE is the temperature range between
PWMMIN and 100% PWM where the fan speed changes linearly.
Otherwise stated, it is the line drawn between the TMIN/PWMMIN
and the (TMIN + TRANGE)/PWM 100% intersection points.
TEMPERATURE
TMIN
100%
PWMMIN
0%
P
W
M
DUTY
CY
CLE
TRANGE
05382-058
Figure 57. TRANGE Parameter Affects Cooling Slope
The TRANGE is determined by the following procedure:
1.
Determine the maximum operating temperature for the
channel (for example, 70°C).
2.
Determine experimentally the fan speed (PWM duty cycle
value) that does not exceed the temperature at the worst-
case operating points. For example, 70°C is reached when
the fans are running at 50% PWM duty cycle.
3.
Determine the slope of the required control loop to meet
these requirements.
4.
Using the ADT7476 evaluation software, graphically
program and visualize this functionality. Ask your local
Analog Devices, Inc. representative for details.
As PWMMIN is changed, the automatic fan control slope changes.
TMIN
100%
33%
0%
P
W
M
DU
T
Y
C
Y
CL
E
50%
30°C
05
38
2-
0
59
Figure 58. Adjusting PWMMIN Changes the Automatic Fan Control Slope
As TRANGE is changed, the slope changes. As TRANGE gets smaller,
the fans reach 100% speed with a smaller temperature change.
05
38
2-
0
60
TMIN
TMIN–HYST
100%
0%
P
W
M
DUT
Y
CY
C
L
E
30°C
40°C
10%
45°C
54°C
Figure 59. Increasing TRANGE Changes the AFC slope
05382-061
100%
MAX
PWM
0%
P
W
M
DUTY
CY
CLE
TRANGE
10%
TMIN–HYST
Figure 60. Changing PWMMAX Does Not Change the AFC Slope
Selecting TRANGE
The TRANGE value can be selected for each temperature channel:
Remote 1, local, and Remote 2 temperature. Bits [7:4] (TRANGE)
of Register 0x5F to Register 0x61 define the TRANGE value for
each temperature channel.
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