Kontron COMe Starterkit Eval T2 Bedienungsanleitung PDF herunterladen (Seite 196)

Mechanical Considerations

7.2.1. Top mounting

For top mounting heatspreaders with non-threaded standoffs (bore hole) are used.

This variant of the heatspreader was designed to be used in a system where the heatspreader

screws need to be inserted from the top side of the complete assembly. In this case the threads

for securing the screws are in the Carrier Board's standoffs. This is the reason why the

heatspreader must have non-threaded (bore hole) standoffs.

Figure 76: Complete assembly using non-threaded (bore hole) heatspreader

Note The torque specification for heatspreader screws is 0.5 Nm.

Caution Do not use a threaded heatspreader together with threaded Carrier Board

standoffs. The combination of the two threads may be staggered, which could

lead to stripping or cross-threading of the threads in either the standoffs of the

heatspreader or Carrier Board.

PICMG

COM Express

Carrier Board Design Guide Rev. 2.0 / December 6, 2013

196/218

HSP stand-off

(Ø2.7mm bore hole)

Baseboard stand-off

(M2.5 thread)

Carrier board

COM Express Module

Heatspreader (HSP)

M2.5 Screw

and Washer

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Kontron COMe Starterkit Eval T2 Bedienungsanleitung Seite 196