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ADT7467
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 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.
T RANGE
100%
PWM MIN
100%
50%
33%
25%
10%
0%
30 ? C
40 ? C
45 ? C
54 ? C
T MIN
Figure 62. Increasing PWM MIN Changes Effective
T RANGE
0%
T MIN
TEMPERATURE
For a given T RANGE value, the temperature at which the
fan runs at full speed, which varies with the PWM MIN value,
can be easily calculated.
Figure 60. 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. Through experimentation, determine 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. The ADT7467 evaluation software can graphically
program and visualize this functionality. Ask your
local Analog Devices sales representative for
details.
100%
50%
33%
0%
30 ? C
40 ? C
T MIN
Figure 61. Adjusting PWM MIN Affects T RANGE
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.
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)
Example 3:
Calculate T MAX , given that T MIN = 30 ? C, T RANGE = 40 ? C,
and PWM MIN = 33% duty cycle = 85 (decimal).
T MAX = T MIN + (Max DC * Min DC) ? T RANGE /170
T MAX = 30 ? C + (100% * 33%) ? 40 ? C/170
T MAX = 30 ? C + (255 * 85) ? 40 ? C/170
T MAX = 70 ? C (Effective T RANGE = 40 ? C)
Example 4:
Calculate T MAX , given that T MIN = 30 ? C, T RANGE = 40 ? C,
and PWM MIN = 50% duty cycle = 128 (decimal).
T MAX = T MIN + (Max DC * Min DC) ? T RANGE /170
T MAX = 30 ? C + (100% * 50%) ? 40 ? C/170
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