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ADT7476
100
90
80
70
60
50
40
30
20
10
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
40 5 C
53.3 5 C
100
90
80
70
60
50
40
30
20
10
VRM TEMP.
CPU TEMPERATURE
AMBIENT TEMPERATURE
0
0
20
40
60
80
100
120
80 5 C
0
0
10
20
30
40
50
60
70
80
90
100
TEMPERATURE ABOVE T MIN
TEMPERATURE ABOVE T MIN
100
90
80
70
60
50
40
30
20
10
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
40 5 C
53.3 5 C
100
90
80
70
60
50
40
30
20
10
VRM TEMP.
CPU TEMPERATURE
AMBIENT TEMPERATURE
0
0
20
40
60
80
100
120
80 5 C
0
0
10
20
30
40
50
60
70
80
90
100
TEMPERATURE ABOVE T MIN
Figure 62. T RANGE and % Fan Speed Slopes with
PWM MIN = 20%
Example: Determining T RANGE for Each Temperature
Channel
The following example shows how the different T MIN and
T RANGE settings can be applied to three different thermal
zones. In this example, the following T RANGE values apply:
T RANGE = 80 ° C for ambient temperature
T RANGE = 53.33 ° C for CPU temperature
T RANGE = 40 ° C for VRM temperature
This example uses the mux configuration described in
Step 2 ? Configuring the Mux with the ADT7476 connected
as shown in Figure 52. Both CPU temperature and VRM
temperature drive the CPU fan connected to PWM1.
Ambient temperature drives the front chassis fan and rear
chassis fan connected to PWM2 and PWM3. The front
chassis fan is configured to run at PWM MIN = 20%. The rear
chassis fan is configured to run at PWM MIN = 30%. The
CPU fan is configured to run at PWM MIN = 10%.
Note: The control range for 4-wire fans is much wider than
that of 3-wire fans. In many cases, 4-wire fans can start with
a PWM drive of as little as 20% or less. In extreme cases,
some 3-wire fans cannot run unless a PWM drive of 60% or
more is applied.
TEMPERATURE ABOVE T MIN
Figure 63. T RANGE and % Fan Speed Slopes for VRM,
Ambient, and CPU Temperature Channels
Step 7 ? T THERM for Temperature Channels
T THERM is the absolute maximum temperature allowed
on a temperature channel. Above this temperature, a
component such as the CPU or VRM can operate beyond its
safe operating limit. When the temperature measured
exceeds T THERM , all fans are driven at 100% PWM duty
cycle (full speed) to provide critical system cooling.
The fans remain running at 100% until the temperature
drops below T THERM minus hysteresis, where hysteresis is
the number programmed into the hysteresis registers (0x6D
and 0x6E). The default hysteresis value is 4 ° C.
The T THERM limit should be considered the maximum
worst-case operating temperature of the system. Because
exceeding any T THERM limit runs all fans at 100%, it has
very negative acoustic effects. Ultimately, this limit should
be set up as a fail-safe, and users should ensure that it is not
exceeded under normal system operating conditions.
Note: T THERM limits are nonmaskable and affect the fan
speed no matter how automatic fan control settings are
configured. This allows some flexibility, because a T RANGE
value can be selected based on its slope, while a hard limit
(such as 70 ° C), can be programmed as T MAX (the
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