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ADT7476
Programming the PWM Maximum Duty Cycle
Registers
The PWM maximum duty cycle 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 PWM maximum
duty cycle register is given by:
Value (decimal) = PWM MAX /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)
Table 46. P WM  MAXIMUM DUTY CYCL E REGISTERS
Register Description Default
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, you can
graphically program and visualize this
functionality.
As PWM MIN is changed, the automatic fan control slope
changes.
100%
50%
33%
0%
30 ° C
T MIN
Figure 58. Adjusting PWM MIN Changes the Automatic
Fan Control Slope
0x38
0x39
0x3A
PWM1 Maximum Duty Cycle
PWM2 Maximum Duty Cycle
PWM3 Maximum Duty Cycle
0xFF (100%)
0xFF (100%)
0xFF (100%)
As T RANGE is changed, the slope changes. As T RANGE
gets smaller, the fans reach 100% speed with a smaller
temperature change.
Step 6 ? T RANGE for Temperature Channels
T RANGE is the range of temperature over which automatic
fan control occurs once the programmed T MIN temperature
has been exceeded. T RANGE is the temperature range between
PWM MIN and 100% PWM where the fan speed changes
linearly. Otherwise stated, it is the line drawn between the
T MIN /PWM MIN and the (T MIN + T RANGE )/PWM100%
intersection points.
100%
10%
0%
100%
T RANGE
T MIN ? HYST
T MIN
30 ° C
40 ° C
45 ° C
54 ° C
Figure 59. Increasing T RANGE Changes the AFC Slope
PWM MIN
0%
T MIN
TEMPERATURE
100%
MAX
PWM
Figure 57. T RANGE Parameter Affects Cooling Slope
The T RANGE 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
10%
0%
T RANGE
T MIN ? HYST
Figure 60. Changing PWM MAX Does Not Change the
AFC Slope
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