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TargetDCYatT1=DCY-LOW-TEMP+(T1

LOW-TEMP)

SLOPE;

HIGH-TEMP=(LOW-TEMP)+

(100

DCY-LOW-TEMP)

SLOPE

(3)

NormalRange

DCY-LOW-TEMP

(DCYatLowTemperature,

Defaultis33%)

100%

LOW-TEMP(LowTemperature)

RPM=0

ActualTemperature

PSV-Temp

(PassiveCoolingTemperature)

Low-Temp-Limit

Out-of-Range

Temperature-to-DCYAdjustmentRange

DCYincreaseswhenthetemperaturerises.

DCYdecreaseswhenthetemperaturereduces.

AMC6821

SBAS386C – MAY 2006 – REVISED JULY 2007

The bits [R-TEMP4:R-TEMP0] of the Remote TEMP-FAN Control Register and the bits [L-TEMP4:L-TEMP0] of

the Local TEMP-FAN Control Register are the low temperature bits that define the low temperature of the control

loops. Bits [SPL2:SPL0] of these registers are the slope bits that define the increment of the duty cycle when the

temprature increases 1

°C. The bits [RATE2:RATE0] of the DCY-RAMP Register (bits [4:1], 0x23) specify the

updating rate of the duty cycle in the temp-fan control mode, and the bits [STEP1:STEP0] define how much the

duty cycle is adjusted by each updating. The target duty cycle for temperature T1 and the HIGH-TEMP (high

temperature) can be calculated by Equation 3:

Figure 28. Active Control Temperature—PWM Duty Cycle

When the active control temperature is equal to or below the corresponding low temperature, the duty cycle is

equal to the value of the DCY-LOW-TEMP Register and the fan runs at a predefined minimum speed. When the

control temperature is equal to or higher than the corresponding high temperature, the PWM duty cycle is set to

100% and the fan runs at full speed. When the active control temperature is equal to or below the corresponding

value of the PSV-Temp Register (the predefined passive cooling temperature), the fan stops and the PWM duty

cycle is set to 0.

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