EVAL-ADT7473EB Analog Devices Inc, EVAL-ADT7473EB Datasheet - Page 7

• Manufacturer Part Number: EVAL-ADT7473EB
• Description: BOARD EVALUATION FOR ADT7473
• Manufacturer: Analog Devices Inc

Specifications of EVAL-ADT7473EB

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

AUTOMATIC FAN CONTROL
Automatic fan control can be configured by opening the
automatic fan control window. To open this window, click Basic
AFC on the Fans drop-down menu toolbar. The fans can be
configured to be controlled by any temperature, and the associ-
ated settings (T
changed in this window. In Figure 10, the settings for PWM1
are shown.
Note that the sliders should be dragged to the right to increase
the value and to the left to decrease the value.
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•
•
•
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Max PWM changes the maximum speed that the fan can
run at while the temperature reading is below the THERM
limit.
Min PWM changes the minimum speed that the fan can
run at while the temperature reading is above the T
limit.
TMIN indicates the temperature at which the fan turns on.
At this temperature, the fans run at the value of Min PWM
duty cycle.
T THERM is the temperature at which the fan goes to full
speed (most likely a critical temperature).
Temp Hyst is the range below which the temperature
reading must reduce before the fan decreases its speed.
TRange defines the slope of the line from Min PWM duty
cycle to Max PWM duty cycle.
MIN
, T
RANGE
, PWM
MIN
, and PWM
MAX
) can be
Figure 10. Automatic Fan Control Window
MIN
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DYNAMIC T
Dynamic T
adapt the system’s cooling solution for best system performance
or lowest possible system acoustics, depending on user or design
requirements. The ADT7473 can self-adjust its fan control loop
to maintain either an operating temperature or a system target
temperature. For example, it can be specified that the ambient
temperature in a system be maintained at 50°C. If the tempera-
ture is below 50°C, then fans may not need to run or may run
very slowly. If the temperature is higher than 50°C, the fans
need to throttle up.
The dynamic T
automatic fan control window (see Figure 10). The Enable
Dynamic tmin checkbox must be selected in order for this
function to work.
For more information on the ADT7473, see the device data sheet.
Operating Point is a temperature that the user wishes to
maintain. This is used in an algorithm to dynamically
adjust the fan speed.
Min Temp Limit—If the temperature reading drops below
this limit, an error flag is set in the status register and an
SMBALERT interrupt is generated.
Max Temp Limit—If the temperature reading exceeds
this limit, an error flag is set in the status register and an
SMBALERT interrupt is generated.
MIN
MIN
control allows the ADT7473 to intelligently
MIN
CONTROL
control settings can be adjusted in the
EVAL-ADT7473