Table 8. Atx Fsc Settings; Table 9. Balanced Technology Extended (Btx) Fsc Settings - Intel EM64T - Celeron D 336 Boxed Ena User Manual

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Table 8. ATX FSC Settings

Parameter
T
HIGH
T
LOW
Minimum PWM Duty
Cycle
PWM Frequency
Spin-up time
T
AVERAGING
When T
DIODE
All Fans ON
Hysteresis
NOTES:
1. A PWM output set to 25 kHz is the design target for the reference and for the Boxed Intel Processor and
the reference design.
2. Use the lowest time available in this range for the device selected.
3. To ensure compliance with the thermal specification, thermal profile and usage of the T
speed control these setting should not be user configurable.

Table 9. Balanced Technology Extended (BTX) FSC Settings

Parameter
T
HIGH
T
LOW
Minimum PWM Duty
Cycle
PWM Frequency
Spin Up Time
T
AVERAGING
When T < T
DIODE LOW
All Fans On
Hysteresis
NOTES:
1. A PWM frequency of 25 kHz is the design target for the reference and for the Intel
and the reference design.
2. Use the lowest time available in this range for the device selected
3. T
AVERAGEING
in fan speed control device (sometimes called ramp range control or spike smoothing). Please select the
lowest setting available close to 4.0 seconds by the fan speed control device
4. The Fan Speed Controller, or Health Monitor Component, takes the result of the two fan speed ramps
(processor and system) and drives the TMA fan to the highest resulting PWM duty cycle (%)
5. For BTX systems, a second thermal sensor is recommended to capture chassis ambient temperature
(for more detail, see Appendix E).
6. To ensure compliance with the thermal specification, thermal profile and usage of the T
speed control these setting should not be user configurable.
Thermal/Mechanical Design Guide
Board Level PWM and Fan Speed Control Requirements
Classification
Required
Required
Required
Required
Suggested
Suggested
< T Suggested
LOW
Suggested
Suggested
Classificatio Processor
n Thermal Diode
Required T
CONTROL
Required T
CONTROL
Required
Required
Suggested
Suggested 4.0 sec
Suggested Minimum PWM%
Suggested T
CONTROL
Suggested 2 °C
= represents the amount of delay time before responding to the temperature change, defined
Processor PWM Output
Thermal Diode
T
CONTROL
T – 10 °C
CONTROL
20%
21–28 kHz
250 – ~500 ms
35 sec
Minimum PWM%
T + 3 °C
CONTROL
2 °C
System
Ambient Diode
54 °C
– 7 °C 47 °C
4.0 sec
Minimum PWM%
+ 3 °C 65 °C
4 °C
Notes
3
3
1
2
for fan
DIODE
PWM Output Notes
3,5
3,5
PWM 1 (TMA) -
20%
21–28 kHz 1
250 – ~ 500 ms 2
3
®
Boxed Processor
for fan
DIODE
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