Datasheet

6-Channel Intelligent Fan Controller

MAX31785

Figure 6. Fan Lookup Table (LUT) Format

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).

NORMALIZED TEMPERATURE

(FROM ONE OR MORE TEMP SENSORS)

MAXIMUM

DESIRED FAN

DUTY CYCLE

OR SPEED

FAN PWM DUTY CYCLE

FAN SPEED (IN RPM)

PWM = 0% DUTY CYCLE

T0 T1 T2 T3 T4 T5 T6 T7

THERMAL

HYSTERESIS