W83627DHG-PT Nuvoton Technology Corporation of America, W83627DHG-PT Datasheet - Page 52

• Manufacturer Part Number: W83627DHG-PT
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627DHG-PT

• Pin Count: 128
• Lead Free Status / RoHS Status: Compliant

Assuming TBase is set to 100 and the PECI temperature is -15 , the real-time temperature value to
the fan control circuit will be 85 (-15 + 100). The value of 55 (hex) will appear in the relevant real-time
temperature register.
While using Smart Fan control function of W83627DHG-P, BIOS/software must include Tbase in
determining the thresholds (limits). In this example, assuming TControl is -10 and Tbase is set to 100
(1)
The value of 5A (hex) should be written to the relevant threshold register.
could be set for proper operation of the fan control circuit. This recommendation is applicable for most
designs. In general, the concept presented in this section could be used to determine the optimum
value of TControl to match the specific application.
(1)
Fan Speed
(PWM Duty Cycle)
, the threshold temperature value corresponding to the “100% fan duty cycle” event is 90 (-10+100).
TControl is typically -10 to -20 for PECI-enabled CPUs. Base on that, a value of 85 ~100 for Tbase
Duty1
Duty2
Temperature (as seen by the W83627DHG-P fan control circuit)
Figure 8-9 Temperature and Fan Speed Relation after Tbase Offsets
80 = (-20 + 100)
(PECI = -20)
Tbase = 100
85 = (-15 + 100)
(PECI = -15)
90 = (-10 + 100)
W83627DHG-P/W83627DHG-PT
(PECI = -10)
Tcontrol
-42-
Publication Release Date: July 09, 2009
TCC Activation
(PECI = 0)
Version 1.94