Figure 7-42. Temperature Range = 10 °C - Intel E1400 - Celeron 2.0GHz 800MHz 512KB Socket 775 Dual-Core CPU Design Manual

Figure 7-42. Temperature Range = 10 °C
It should be noted that having T
TDP power levels and high system ambient. See Section E.4 for additional discussion
on T
CONTROL
For use with the ATX Boxed Processor enabled reference solution a T
10 °C is recommended. For BTX Boxed Processor enabled reference solutions, T
value of 7 °C is recommended.
E.2.1.2 Minimum PWM Duty Cycle
The final step in determining the FSC setting is to determine the minimum PWM Duty
cycle. This is the fan speed for any T
dependent on
Acoustic target at system idle
Voltage regulator cooling
For a motherboard design intending to use the Boxed Processor or the enabled
reference thermal solution the recommended minimum PWM duty cycle is 20%.
Note: Set minimum PWM Duty Cycle only as low as required to meet acoustic requirements.
The FSC design needs to accommodate transition from a low power state to TDP
workloads without having PROCHOT# becoming active.
114
Fan RPM
3500
3000
2500
2000
1500
1000
500
0
versus Thermal Profile
Tdiode Tcontrol
Time (s)
above T is expected for workloads near
SENSOR CONTROL
< T . The selection of this value is
SENSOR LOW
Thermal and Mechanical Design Guidelines
Legacy Fan Speed Control
Tlow
80
75
70
65
60
55
50
45
40
value of
RANGE
RANGE