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Thermal/Mechanical Reference Design
2.5.7.3CEK Spring
The CEK spring, which is attached on the secondary side of the baseboard, is made from 0.80 mm [0.0315 in.] thick 301 stainless steel half hard. Any future versions of the spring will be made from a similar material. The CEK spring has four embosses which, when assembled, rest on the top of the chassis standoffs. The CEK spring is located between the chassis standoffs and the heatsink standoffs. The purpose of the CEK spring is to provide compressive preload at the TIM interface when the baseboard is pushed down upon it. This spring does not function as a clip of any kind. The two tabs on the spring are used to provide the necessary compressive preload for the TIM when the whole solution is assembled. The tabs make contact on the secondary side of the baseboard. In order to avoid damage to the contact locations on the baseboard, the tabs are insulated with a 0.127 mm [0.005 in.] thick Kapton* tape (or equivalent). Figure
Figure 2-24. CEK Spring Isometric View
Figure 2-25. Isometric View of CEK Spring Attachment to the Base Board
Secondary | Primary |
Please refer to Appendix B for more detailed mechanical drawings of the CEK spring. Also, the baseboard keepout requirements shown in Appendix B must be met to use this CEK spring design.
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