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ADT7473
Getting the most benefit from the automatic fan control
mode involves characterizing the system to find the best
T MIN and T RANGE settings for the control loop, and the best
PWM MIN value for the quietest fan speed setting. Using the
ADT7473/ADT7473 ? 1’s dynamic T MIN control mode,
however, shortens the characterization time and alleviates
tweaking the control loop settings because the device can
self-adjust during system operation.
Dynamic T MIN control mode is operated by specifying the
operating zone temperatures required for the system.
Associated with this control mode are three operating point
Table 49 provides a brief description of each parameter.
Table 49. T MIN CONTROL LOOP PARAMETERS
Parameter Description
T LOW If the temperature drops below the T LOW limit,
an error flag is set in a status register and an
SMBALERT interrupt can be generated.
T HIGH If the temperature exceeds the T HIGH limit, an
error flag is set in a status register and an
SMBALERT interrupt can be generated.
T MIN The temperature at which the fan turns on
under automatic fan speed control.
registers, one for each temperature channel. This allows the
system thermal solution to be broken down into distinct
thermal zones. For example, CPU operating temperature is
70 ? C, VRM operating temperature is 80 ? C, and ambient
operating temperature is 50 ? C. The ADT7473/ADT7473 ? 1
dynamically alters the control solution to maintain each
zone temperature as closely as possible to its target operating
point.
Operating
Point
T THERM
T RANGE
The target temperature for a particular
temperature zone. The ADT7473/ADT7473 ? 1
attempts to maintain system temperature at
about the operating point by adjusting the T MIN
parameter of the control loop.
If the temperature exceeds this critical limit, the
fans can be run at 100% for maximum cooling.
Programs the PWM duty cycle vs. temperature
control slope.
T HIGH
T RANGE
Table 48. OPERATING POINT REGISTERS
Register Description Default
0x33 Remote 1 Operating Point 0xA4 (100 ? C)
0x34 Local Temp. Operating Point 0xA4 (100 ? C)
0x35 Remote 2 Operating Point 0xA4 (100 ? C)
Figure 66 shows an overview of the parameters that affect
the operation of the dynamic T MIN control loop.
TEMPERATURE
T LOW T MIN OPERATING T THERM
POINT
Figure 66. Dynamic T MIN Control Loop
Dynamic T MIN Control Programming
Because the dynamic T MIN control mode is a basic
extension of the automatic fan control mode, program the
automatic fan control mode parameters first, as described in
the Step 1: Hardware Configuration section to the Step 8:
T HYST for Temperature Channels section, then proceed with
dynamic T MIN control mode programming.
Step 9: Operating Points for Temperature Channels
The operating point for each temperature channel is the
optimal temperature for that thermal zone. The hotter each
zone is allowed to be, the quieter the system, because the
fans are not required to run as fast. The ADT7473/
ADT7473 ? 1 increases or decreases fan speeds as necessary
to maintain the operating point temperature, allowing for
system-to-system variation and removing the need for
worst-case design. If a sensible operating point value is
chosen, any T MIN value can be selected in the system
characterization. If the T MIN value is too low, the fans run
sooner than required, and the temperature is below the
operating point. In response, the ADT7473/ADT7473 ? 1
increases T MIN to keep the fans off longer and to allow the
temperature zone to get closer to the operating point.
Likewise, too high a T MIN value causes the operating point
to be exceeded, and in turn, the ADT7473/ADT7473 ? 1
reduces T MIN to turn the fans on sooner to cool the system.
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