MAX34441EVKIT# Maxim Integrated, MAX34441EVKIT# Datasheet - Page 25

• Manufacturer Part Number: MAX34441EVKIT#
• Description: Power Management IC Development Tools MAX34441 Eval Kit
• Manufacturer: Maxim Integrated
• Type: PWM Controllersr
• Series: MAX34441r

Specifications of MAX34441EVKIT#

• Rohs: yes
• Product: Power Management Development Tools
• Tool Is For Evaluation Of: MAX34441
• Interface Type: I2C
• Maximum Operating Temperature: + 85 C
• Part # Aliases: 90-34441#K00

Figure 3 shows the fan spin-up process. When the fan is
spinning up, the number of revolutions is checked every
200ms for up to 2s. When the number of cumulated revo-
lutions is greater than or equal to the spin-up relaxation
criteria, the fan passes spin-up. If the fan has a locked
rotor output, fan spin-up passes when the locked rotor
signal is no longer asserted.
Figure 3. Fan Spin-Up
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0
PMBus 5-Channel Power-Supply Manager
AUTOMATIC
SPIN-UP
ENABLED
AUTOMATIC
SPIN-UP
DISABLED
0.2
0.4
Fan Spin-Up
SPIN-UP
CRITERIA MET
and Intelligent Fan Controller
0.6
CYCLE AFTER AUTOMATIC SPIN-UP
ALWAYS RETURN TO 40% DUTY
BEFORE BEGINNING PWM RAMP
(EVEN IF BEYOND 1 SECOND)
TIME (SECONDS)
When spin-up passes, the device forces the fan PWM
with a 40% duty cycle. The 40% duty cycle is maintained
until the next temperature conversion is completed,
which occurs once a second. After the temperature con-
version, the device enters either manual mode operation
or automatic operation using MFR_FAN_LUT.
0.8
1.0
RAMP PWM TO TARGET PWM OR RPM
(CONSTRAINED BY THE RAMP BITS)
INITIAL TARGET PWM OR
RPM DETERMINED AFTER
TEMPERATURE CONVERSION
1.2
1.4
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