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ADT7490
THERMAL CALIBRATION
100%
PWM
MIN
S
PWM
CONFIG
PWM
GENERATOR
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM1
REMOTE1 =
AMBIENT
TEMP
LOCAL =
VRM TEMP
T MIN T RANGE
THERMAL CALIBRATION
T MIN T RANGE
THERMAL CALIBRATION
0%
100%
0%
100%
MUX
PWM
MIN
S
PWM
MIN
TACHOMETER 1
MEASUREMENT
PWM
CONFIG
PWM
GENERATOR
TACHOMETER 2
MEASUREMENT
PWM
CONFIG
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
RAMP
TACH1
PWM2
TACH2
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM3
REMOTE2 =
GPU TEMP
T MIN T RANGE
THERMAL CALIBRATION
0%
TACHOMETER 3
AND 4
MEASUREMENT
TACH3
100%
PECI =
T MIN
T RANGE
0%
CPU TEMP
Figure 48. Automatic Fan Control Block Diagram
Step 1: Hardware Configuration
During system design, the motherboard sensing and
control capabilities should be addressed early in the design
stages. Decisions about how these capabilities are used
should involve the system thermal/mechanical engineer.
Ask the following questions:
? What ADT7490 functionality is used?
? PWM2 or SMBALERT?
? TACH4 fan speed measurement or overtemperature
THERM function?
? 2.5 V IN voltage monitoring or overtemperature
THERM function?
The ADT7490 offers multifunctional pins that can be
reconfigured to suit different system requirements and
physical layouts. These multifunction pins are software
programmable.
? How many fans are supported in the system, three or
four? This influences the choice of whether to use the
TACH4 pin or to reconfigure it for the THERM
function.
? Is the CPU fan to be controlled using the ADT7490, or
will the CPU fan run at full speed 100% of the time?
If run at 100%, it frees up a PWM output, but the system
is louder.
? Where is the ADT7490 going to be physically located
in the system?
This influences the assignment of the temperature
measurement channels to particular system thermal zones.
For example, locating the ADT7490 close to the VRM
controller circuitry allows the VRM temperature to be
monitored using the local temperature channel.
Step 2: Configuring the Muxtiplexer
After the system hardware configuration is determined,
the fans can be assigned to particular temperature channels.
Not only can fans be assigned to individual channels, but the
behavior of the fans is also configurable. For example, fans
can be run under automatic fan control, can be run manually
(under software control), or can be run at the fastest speed
calculated by multiple temperature channels. The mux is the
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