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ADT7473
Table 45. PWM MAX REGISTERS
Register Description
Default
4. Graphically program and visualize this
functionality using the ADT7473/ADT7473 ? 1
evaluation software.
0x38
0x39
PWM1 Maximum Duty Cycle
PWM2 Maximum Duty Cycle
0xFF (100%)
0xFF (100%)
Figure 57 shows how adjusting PWM MIN affects T RANGE .
0x3A PWM3 Maximum Duty Cycle 0xFF (100%)
See the Note on Fan Speed and PWM Duty Cycle section.
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
is exceeded. T RANGE is a temperature slope, not an arbitrary
value, that is, a T RANGE of 40 ? C holds true only for
PWM MIN = 33%. If PWM MIN is increased or decreased, the
effective T RANGE changes. Refer to Figure 56.
T RANGE is implemented as a slope, which means that as
PWM MIN is changed, T RANGE changes, but the actual slope
remains the same. The higher the PWM MIN value, the
smaller the effective T RANGE , that is, the fan reaches full
speed (100%) at a lower temperature. Figure 58 shows how
increasing PWM MIN changes the effective T RANGE .
100%
100%
T RANGE
50%
33%
25%
10%
0%
PWM MIN
0%
T MIN
30 ? C
40 ? C
45 ? C
54 ? C
T MIN
TEMPERATURE
Figure 58. Increasing PWM MIN Changes Effective
T RANGE
Figure 56. T RANGE Parameter Affects Cooling Slope
The T RANGE 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.
100%
50%
33%
0%
30 ? C
40 ? C
T MIN
Figure 57. Adjusting PWM MIN Affects T RANGE
For a given T RANGE value, the temperature at which the
fan runs at full speed for different PWM MIN values can be
easily calculated as follows:
T MAX = T MIN + (Max DC ? Min DC) ? T RANGE /170
where:
T MAX is the temperature at which the fan runs full speed.
T MIN is the temperature at which the fan turns on.
Max DC is the maximum duty cycle (100%) = 255 decimal.
Min DC is equal to PWM MIN .
T RANGE is the duty PWM duty cycle vs. temperature slope.
Example 1
Calculate T, given that T MIN = 30 ? C, T RANGE = 40 ? C, and
PWM MIN = 10% duty cycle = 26 (decimal).
T MAX = T MIN + (Max DC ? Min DC) ? T RANGE /170
T MAX = 30 ? C + (100% ? 10%) ? 40 ? C/170
T MAX = 30 ? C + (255 ? 26) ? 40 ? C/170
T MAX = 84 ? C (effective T RANGE = 54 ? C)
Example 2
Calculate T MAX , given that T MIN = 30 ? C, T RANGE =
40 ? C, and PWM MIN = 25% duty cycle = 64 (decimal).
T MAX = T MIN + (Max DC ? Min DC) ? T RANGE /170
T MAX = 30 ? C + (100% ? 25%) ? 40 ? C/170
T MAX = 30 ? C + (255 ? 64) ? 40 ? C/170
T MAX = 75 ? C (effective T RANGE = 45 ? C)
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