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ADT7476
Selecting T RANGE
The T RANGE value can be selected for each temperature
channel: Remote 1, local, and Remote 2 temperature.
Bits [7:4] (T RANGE ) of Register 0x5F to Register 0x61
define the T RANGE value for each temperature channel.
Table 47. SELECTING A T RANGE VALUE
until the PWM duty cycle reaches the appropriate duty cycle
as defined by the AFC curve.
Figure 61 shows PWM duty cycle vs. temperature for
each T RANGE setting. The lower graph shows how each
T RANGE setting affects fan speed vs. temperature. As can be
seen from the graph, the effect on fan speed is nonlinear.
Bits [7:4] (Note 1)
0000
0001
0010
0011
0100
0101
0110
0111
T RANGE ( 5 C)
2
2.5
3.33
4
5
6.67
8
10
100
90
80
70
60
50
40
30
20
2 5 C
2.5 5 C
3.33 5 C
4 5 C
5 5 C
6.67 5 C
8 5 C
10 5 C
13.3 5 C
16 5 C
20 5 C
26.6 5 C
32 5 C
1000
1001
1010
1011
13.33
16
20
26.67
10
0
0
20
40 60 80 100
TEMPERATURE ABOVE T MIN
120
4 0 5 C
53.3 5 C
80 5 C
1100
1101
1110
32 (Default)
40
53.33
100
90
80
2 5 C
2.5 5 C
3.33 5 C
4 5 C
1111 80
1. Register 0x5F configures Remote 1 T RANGE ; Register 0x60
configures local T RANGE ; Register 0x61 configures Remote 2
T RANGE .
70
60
50
5 5 C
6.67 5 C
8 5 C
10 5 C
13.3 5 C
Actual Changes in PWM Output
(Advanced Acoustics Settings)
While the automatic fan control algorithm describes the
general response of the PWM output, it is also necessary to
note that the enhance acoustics registers (0x62 and 0x63)
can be used to set/clamp the maximum rate of change of
40
30
20
10
0
0
20
40
60
80
100
120
16 5 C
20 5 C
26.6 5 C
32 5 C
4 0 5 C
53.3 5 C
80 5 C
PWM output for a given temperature zone. This means that
if T RANGE is programmed with an AFC slope that is quite
steep, a relatively small change in temperature could cause
a large change in PWM output and possibly an audible
change in fan speed, which can be noticeable/ bothersome
to end users.
Decreasing the speed the PWM output changes by
programming the smoothing on the appropriate temperature
channels (Register 0x62 and Register 0x63) changes how
fast the fan speed increases/decreases in the event of a
temperature spike. The PWM duty cycle increases slowly
TEMPERATURE ABOVE T MIN
Figure 61. T RANGE vs. Actual Fan Speed
(Not PWM Drive) Profile
The graphs in Figure 61 assume that the fan starts from
0% PWM duty cycle. Clearly, the minimum PWM duty
cycle, PWM MIN , needs to be factored in to see how the loop
actually performs in the system. Figure 62 shows how
T RANGE is affected when the PWM MIN value is set to 20%.
It can be seen that the fan actually runs at about 45% fan
speed when the temperature exceeds T MIN .
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