INTEL4线风扇设计规范

4线风扇设计规范 INTEL  大家参考  


INTEL_4线风扇设计规范.pdf



4-Wire Pulse Width Modulation
(PWM) Controlled Fans
Specification
September 2005
Revision 1.3

1 Introduction . 7
1.1 Overview. 7
2 Electrical Specifications 9
2.1 Fan Requirements.. 9
2.1.1 Fan Input Voltage. 9
2.1.2 Current . 9
2.1.3 Tachometer Output Signal 9
2.1.4 PWM Control Input Signal  9
2.2 Test Methodology. 10
2.3 Hardware Monitor Device.. 10
2.3.1 PWM Output Signal  10
2.4 Considerations for Motherboard Designers . 11
3 Fan Speed Control . 13
3.1 Maximum Fan Speed Requirements. 13
3.2 Minimum Fan Speed Requirements.. 13
3.3 Fan Speed Response to PWM Control Input Signal. 14
3.4 Operation below Minimum RPM 14
4 Required Features . 19
4.1.1 Polarity Protection. 19
4.1.2 Rotor Lock Protection  19
4.1.3 Wire Length 19
4.1.4 Wire Type 19
4.1.5 Connector Housing . 19
4.1.6 Fan Connector Pinout and Wiring Colors .. 19
5 Environmental and Reliability. 21
5.1.1 Operating Temperature  21
5.1.2 Non-operating Humidity  21
5.1.3 Non-operating Thermal Cycling. 21
5.1.4 Power Cycling . 21
5.1.5 Reliability. 21
6 Reference Drawings . 23

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