參數(shù)資料
型號: ADT7473ARQZ-1REEL
廠商: ANALOG DEVICES INC
元件分類: 溫度/濕度傳感器
英文描述: DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 2.50Cel, RECTANGULAR, SURFACE MOUNT
封裝: ROHS COMPLIANT, MO-137AB, QSOP-16
文件頁數(shù): 33/72頁
文件大?。?/td> 1494K
代理商: ADT7473ARQZ-1REEL
ADT7473/ADT7473-1
Rev. C | Page 39 of 72
Programming the PWMMAX Registers
The PWMMAX registers are 8-bit registers that allow the
maximum PWM duty cycle for each output to be configured
anywhere from 0% to 100%. This allows the maximum PWM
duty cycle to be set in steps of 0.39%.
The value to be programmed into the PWMMAX register is given by
Value (decimal) = PWMMAX/0.39
Example 1
For a maximum PWM duty cycle of 50%
Value (decimal) = 50/0.39 = 128 (decimal)
Value = 128 (decimal) or 80 (hex)
Example 2
For a minimum PWM duty cycle of 75%
Value (decimal) = 75/0.39 = 85 (decimal)
Value = 192 (decimal) or C0 (hex)
PWMMAX Registers
Register 0x38, PWM1 Maximum Duty Cycle = 0xFF
(100% default)
Register 0x39, PWM2 Maximum Duty Cycle = 0xFF
(100% default)
Register 0x3A, PWM3 Maximum Duty Cycle = 0xFF
(100% default)
STEP 6: TRANGE FOR TEMPERATURE CHANNELS
TRANGE is the range of temperature over which automatic fan
control occurs once the programmed TMIN temperature is
exceeded. TRANGE is a temperature slope, not an arbitrary value,
that is, a TRANGE of 40°C holds true only for PWMMIN = 33%. If
PWMMIN is increased or decreased, the effective TRANGE changes.
Refer to Figure 58.
TEMPERATURE
TMIN
100%
PWMMIN
0%
P
W
M
DUT
Y
CY
CL
E
TRANGE
04
68
6-
0
55
Figure 58. TRANGE Parameter Affects Cooling Slope
The TRANGE or fan control slope is determined by the following
procedure:
1.
Determine the maximum operating temperature for that
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.
Graphically program and visualize this functionality using
the ADT7473/ADT7473-1 evaluation software. Ask your
local Analog Devices, Inc. representative for details.
Figure 59 shows how adjusting PWMMIN affects TRANGE.
TMIN
100%
33%
0%
PW
M
DU
T
Y
CYCL
E
50%
30°C
40°C
04
68
6
-05
6
Figure 59. Adjusting PWMMIN Affects TRANGE
TRANGE is implemented as a slope, which means that as PWMMIN
is changed, TRANGE changes, but the actual slope remains the
same. The higher the PWMMIN value, the smaller the effective
TRANGE, that is, the fan reaches full speed (100%) at a lower
temperature. Figure 60 shows how increasing PWMMIN changes
the effective TRANGE.
TMIN
100%
33%
0%
P
W
M
DU
T
Y
CY
CL
E
50%
30°C
40°C
25%
10%
45°C
54°C
04
68
6-
0
57
Figure 60. Increasing PWMMIN Changes Effective TRANGE
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