E2000 datasheet(101/104 Pages) INTEL

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Datasheet

101

Boxed Processor Specifications

If the boxed processor fan heatsink 4-pin connector is connected to a 4-pin

motherboard header and the motherboard is designed with a fan speed controller with

PWM output (CONTROL see Table 34) and remote thermal diode measurement

capability the boxed processor will operate as follows:

As processor power has increased the required thermal solutions have generated

increasingly more noise. Intel has added an option to the boxed processor that allows

system integrators to have a quieter system in the most common usage.

The 4th wire PWM solution provides better control over chassis acoustics. This is

achieved by more accurate measurement of processor die temperature through the

processor's temperature diode (T-diode). Fan RPM is modulated through the use of an

ASIC located on the motherboard that sends out a PWM control signal to the 4th pin of

the connector labeled as CONTROL. The fan speed is based on actual processor

temperature instead of internal ambient chassis temperatures.

If the new 4-pin active fan heat sink solution is connected to an older 3-pin baseboard

CPU fan header it will default back to a thermistor controlled mode, allowing

compatibility with existing 3-pin baseboard designs. Under thermistor controlled mode,

the fan RPM is automatically varied based on the Tinlet temperature measured by a

thermistor located at the fan inlet.

For more details on specific motherboard requirements for 4-wire based fan speed

control see the appropriate Thermal and Mechanical Design Guidelines (see

Section 1.2).

§ §§

Table 35.

Fan Heatsink Power and Signal Specifications

Boxed Processor Fan

Heatsink Set Point (ºC)

Boxed Processor Fan Speed

Notes

X ≤ 30

When the internal chassis temperature is below or equal to

this set point, the fan operates at its lowest speed.

Recommended maximum internal chassis temperature for

nominal operating environment.

NOTES:

1. Set point variance is approximately ± 1 °C from fan heatsink to fan heatsink.

Y = 35

When the internal chassis temperature is at this point, the

fan operates between its lowest and highest speeds.

Recommended maximum internal chassis temperature for

worst-case operating environment.

Z ≥ 38

When the internal chassis temperature is above or equal to

this set point, the fan operates at its highest speed.

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