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ADT7473
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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
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80 5 C
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TEMPERATURE ABOVE T MIN
TEMPERATURE ABOVE T MIN
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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
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TEMPERATURE ABOVE T MIN
Figure 60. 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 = 53.3 ? C for CPU temperature
T RANGE = 40 ? C for VRM temperature
This example uses the mux configuration described in the
Step 2: Configuring the Mux section, with the ADT7473/
ADT7473 ? 1 connected as shown in Figure 61. 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 on 4-wire Fans
The control range for 4-wire fans is much wider than that
for 3-wire fans. In many cases, 4-wire fans can start with a
PWM drive of as little as 20%.
TEMPERATURE ABOVE T MIN
Figure 61. 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. When operating above this
temperature, a component such as the CPU or VRM might
be 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 ? hysteresis, where hysteresis is the
number programmed into the hysteresis registers
(Register 0x6D and Register 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 it should not be exceeded under
normal system operating conditions.
Note that the T THERM limits are nonmaskable and affect
the fan speed no matter how the automatic fan control
settings are configured. This allows some flexibility because
a T RANGE value can be selected based on its slope, while a
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