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參數(shù)資料
| 型號： | ADT7462ACPZ-500RL7 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 4Cel, SQUARE, SURFACE MOUNT |
| 封裝： | 5 X 5 MM, LFCSP-32 |
| 文件頁數(shù)： | 37/88頁 |
| 文件大?。?/td> | 836K |
| 代理商： | ADT7462ACPZ-500RL7 |
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ADT7462
Rev. 2 | Page 42 of 88 | www.onsemi.com
For a given TRANGE value, the temperature at which the fan runs
at full speed for different PWMMIN values can be easily
calculated by
TMAX = TMIN + (Max DC Min DC) × TRANGE/170
where:
TMAX is the temperature at which the fan runs full speed.
TMIN is the temperature at which the fan turns on.
Max DC is the maximum duty cycle (100%) = 255 decimal.
Min DC is equal to PWMMIN.
TRANGE is the PWM duty cycle vs. temperature slope.
Example 1
Calculate TMAX, given that TMIN = 30°C, TRANGE = 40°C, and
PWMMIN = 10% duty cycle = 26 (decimal).
TMAX = TMIN + (Max DC Min DC) × TRANGE/170
TMAX = 30°C + (100% 10%) × 40°C/170
TMAX = 30°C + (255 26) × 40°C/170
TMAX = 84°C (effective TRANGE = 54°C)
Example 2
Calculate TMAX, given that TMIN = 30°C, TRANGE = 40°C, and
PWMMIN = 25% duty cycle = 64 (decimal).
TMAX = TMIN + (Max DC Min DC) × TRANGE/170
TMAX = 30°C + (100% 25%) × 40°C/170
TMAX = 30°C + (255 64) × 40°C/170
TMAX = 75°C (effective TRANGE = 45°C)
Example 3
Calculate TMAX, given that TMIN = 30°C, TRANGE = 40°C, and
PWMMIN = 33% duty cycle = 85 (decimal).
TMAX = TMIN + (Max DC Min DC) × TRANGE/170
TMAX = 30°C + (100% 33%) × 40°C/170
TMAX = 30°C + (255 85) × 40°C/170
TMAX = 70°C (effective TRANGE = 40°C)
Example 4
Calculate TMAX, given that TMIN = 30°C, TRANGE = 40°C, and
PWMMIN = 50% duty cycle = 128 (decimal).
TMAX = TMIN + (Max DC Min DC) × TRANGE/170
TMAX = 30°C + (100% 50%) × 40°C/170
TMAX = 30°C + (255 128) × 40°C/170
TMAX = 60°C (effective TRANGE = 30°C)
Selecting a TRANGE Slope
The TRANGE value can be selected for each temperature channel:
local, Remote 1, Remote 2, and Remote 3. Bits [7:4] (RANGE) of
Register 0x60 to Register 0x63 define the TRANGE value for each
temperature channel (see Table 85 and Table 86).
Summary of TRANGE Function
When using the automatic fan control function, the temperature
at which the fan reaches full speed can be calculated by
TMAX = TMIN + TRANGE
(6)
Equation 6 holds true only when PWMMIN is equal to 33% PWM
duty cycle.
Increasing or decreasing PWMMIN changes the effective TRANGE,
although the fan control still follows the same PWM duty cycle
to temperature slope. The effective TRANGE for different PWMMIN
values can be calculated using Equation 7.
TMAX = TMIN + (Max DC Min DC) × TRANGE/170
(7)
where (Max DC Min DC) × TRANGE/170 is the effective
TRANGE value.
Figure 61 shows PWM duty cycle vs. temperature for each
TRANGE setting. The lower graph shows how each TRANGE setting
affects fan speed vs. temperature. As shown in the graph, the
effect on fan speed is nonlinear.
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