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EVAL-ADM1030 Datasheet, PDF (12/14 Pages) Analog Devices – Evaluation Board for ACPI Temperature Monitor and PWM Fan Controller | |||
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EVAL-ADM1030/31
Preliminary Technical Data
RPM CONTROL MODE
In this method of control the user programs the required RPM
values to the ADM1030/31. Click on the âRPM Feedback
Modeâ in the âMode Selectâ window of the Control Tab.
1. Enter the required RPM Value in the window.
2. Choose which fan you wish to run at that RPM value.
3. Enter the fan divisor value for that fan.
4. Click on Calculate. The software will calculate Count. This
is the value that has to be written to the ADM1030/31 Tach
High Limit Register to maintain the required speed. See the
datasheet for an explanation of the formulas.
5. Click on âEnable RPM Modeâ to place the ADM1030/31 in
RPM Feedback mode.
6. Sometimes after you place a value in the âEnter RPM Modeâ
Y window and click âCalculateâ the âEnable RPM Modeâ button
does not become active. This is because the Count value is
R outside the particular fanâs RPM range. The fanâs RPM range is
A determined by the âFan Divisor Valueâ.
IN L PWM DUTY CYCLE
IM A In this method the ADM1030/31 is placed under software
EL IC control. Fan speed is controlled by programming PWM values
in to the ADM1030/31. Click on âPWM Duty Cycle Selectâ
R N in the âMode Selectâ window of the Control Tab.
P H 1. Each fan can be programmed with a duty cycle value of
C A between 0% and 100%.
E T 2. Choose the required PWM value for each fan, the value
T DA chosen must be on the list in the drop down window as the
ADM1030/31 can only be programmed in 6% increments.
3. Click on âEnable PWM Modeâ
4. The fan/s should then either spin up or down to the
programmed value.
TEMPERATURE CONTROL
Temperature control allows the user to heat up the remote
thermal diodes on the ADM1030/31 Evaluation Board. First
choose which diode is to be monitored. Then Click on âEnable
Controlâ. This causes a current to be switched through the two
large heating resistors behind the remote thermal diodes which
in turn causes the remote thermal diodes to heat up. These
resistors can become very hot so care is required. Do not touch
when there is a current flowing through them. Use the slider to
vary the PWM duty cycle applied to the heating resistors.
Adjusting the slider allows limited control of the temperature of
the heating resistors.
â12â
REV. PrA
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