Intel E1400 Design Guidelines - Page 114

E.2.1.2, Minimum PWM Duty Cycle

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Figure 7-42. Temperature Range = 10 °C Legacy Fan Speed Control Fan RPM 3500 3000 2500 2000 1500 1000 500 0 Tdiode Tcontrol Time (s) Tlow 80 75 70 65 60 55 50 45 40 It should be noted that having TSENSOR above TCONTROL is expected for workloads near TDP power levels and high system ambient. See Section E.4 for additional discussion on TCONTROL versus Thermal Profile For use with the ATX Boxed Processor enabled reference solution a TRANGE value of 10 °C is recommended. For BTX Boxed Processor enabled reference solutions, TRANGE 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 TSENSOR < TLOW. The selection of this value is 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 Thermal and Mechanical Design Guidelines

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Legacy Fan Speed Control
114
Thermal and Mechanical Design Guidelines
Figure 7-42. Temperature Range = 10 °C
0
500
1000
1500
2000
2500
3000
3500
Time (s)
40
45
50
55
60
65
70
75
80
Fan
RPM
Tdiode
Tcontrol
Tlow
It should be noted that having T
SENSOR
above T
CONTROL
is expected for workloads near
TDP power levels and high system ambient. See Section E.4 for additional discussion
on T
CONTROL
versus Thermal Profile
For use with the ATX Boxed Processor enabled reference solution a T
RANGE
value of
10 °C is recommended. For BTX Boxed Processor enabled reference solutions, T
RANGE
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
SENSOR
< T
LOW
. The selection of this value is
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.