MAX31785_11 Datasheet, PDF (44/48 Pages) Maxim Integrated Products – 6-Channel Intelligent Fan Controller

6-Channel Intelligent Fan Controller
FAN SPEED STEP: Fan PWM Duty Cycle or Fan Speed Setting
If bit 6 in FAN_CONFIG_1_2 is set to zero, the FAN SPEED STEP sets the fan PWM duty cycle at each temperature step
breakpoint. The valid duty cycle range is 0 to 100 (inclusive). Any values greater than 100 (decimal) result in 100% PWM
duty cycle being generated, and any values less than 0 (decimal) result in 0% PWM duty cycle.
If bit 6 in FAN_CONFIG_1_2 is set to 1, the FAN SPEED STEP sets the fan target speed (in RPM) at each temperature
step breakpoint. The valid fan speed range is 0 to 32,767 (inclusive).
MAXIMUM
DESIRED FAN
DUTY CYCLE
S7
OR SPEED
S6
THERMAL
HYSTERESIS
S5
S4
FAN PWM DUTY CYCLE
OR
FAN SPEED (IN RPM)
S3
S2
S1
S0
PWM = 0% DUTY CYCLE
T0
T1
T2
T3
T4
T5
T6
T7
NORMALIZED TEMPERATURE
(FROM ONE OR MORE TEMP SENSORS)
Figure 6. Fan Lookup Table (LUT) Format
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