EVAL-ADM1030 AD [Analog Devices], EVAL-ADM1030 Datasheet - Page 11

• Manufacturer Part Number: EVAL-ADM1030
• Description: Evaluation Board for ACPI Temperature Monitor and PWM Fan Controller
• Manufacturer: AD [Analog Devices]

REV. PrA
ADM1030/31 MODES OF OPERATION
The ADM1030/31 has four modes of operation. They are
as follows
1. Automatic Fan Speed Control Mode
2. Filtered Automatic Fan Speed Control Mode
3. PWM Duty Cycle Select Mode
4. RPM Feedback Mode
The ADM1030/31 software allows the user to choose which
mode of operation they require. It will then prompt the user
to provide the information required by that particular mode
of operation.
AUTOMATIC FAN SPEED CONTROL MODE.
Click on “Automatic Fan Speed Control” in the “Mode
Select” window in the Control Tab. This causes the
“Automatic Fan Speed Control” window to be displayed.
1. First choose which Control Operation is required, i.e.
which temperature channel controls the fan.
2. Choose the necessary Tmin’s and Trange’s for the
chosen Control Operation.
3. Choose the spin up times for Fan1 and if you are using
the ADM1031 for Fan2 also.
4. Click on “Enable Control”
5. Automatic Fan Speed Control is enabled using the user
defined parameters.
Preliminary Technical Data
–11–
FILTERED AUTOMATIC FAN SPEED CONTROL
MODE.
This mode is almost identical to the Automatic Fan
Speed Control Mode. The main difference is the rate at
which fan speed is ramped up after a temperature
increase. Filtering is implemented by two different
means, selecting the sampling rate of the ADC and
ramping the fan speed to the desired speed (In Auto-
matic Fan Speed Control Mode the fan speed is jumped
immediately to the newly calculated speed). To imple-
ment Filtered Automatic Fan Speed Control click on
“Filtered Automatic Control” in the “Mode Select”
window of the Control Tab. This causes the “Filter
Mode” window to be displayed.
1. Choose an “Increment Rate” and an “ADC Sample
Rate”. See the datasheet for more information on these
parameters.
2. The user may also choose to enable or disable “Fan
Spin Up”
3. Finally the user is prompted to choose Automatic
Fan Speed Control Parameters. This should be com-
pleted if these Parameters have not already been chosen.
4. Click on “Enable Fan Filter” to implement Filtered
Automatic Fan Speed Control. (Enable Fan1 for the
ADM1030 and Fan1 and Fan2 for the ADM1031)
EVAL-ADM1030/31