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STPC4EDBC Datasheet(PDF) 83 Page - STMicroelectronics |
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STPC4EDBC Datasheet(HTML) 83 Page - STMicroelectronics |
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83 / 93 page  DESIGN GUIDELINES Release 1.5 - January 29, 2002 83/93 6.4.5. THERMAL DISSIPATION 6.4.5.1. Power saving Thermal dissipation of the STPC depends mainly on supply voltage. When the system does not need to work at the upper voltage limit, it may therefore be beneficial to reduce the voltage to the lower voltage limit, where possible. This could save a few 100’s of mW. The second area to look at is unused interfaces and functions. Depending on the application, some input signals can be grounded, and some blocks not powered or shutdown. Clock speed dynamic adjustment is also a solution that can be used along with the integrated power management unit. 6.4.5.2. Thermal balls The standard way to route thermal balls to ground layer implements only one via pad for each ball pad, connected using a 8-mil wire. With such configuration the Plastic BGA package does 90% of the thermal dissipation through the ground balls, and especially the central thermal balls which are directly connected to the die. The remaining 10% is dissipated through the case. Adding a heat sink reduces this value to 85%. As a result, some basic rules must be followed when routing the STPC in order to avoid thermal problems. As the whole ground layer acts as a heat sink, the ground balls must be directly connected to it, as illustrated in Figure 6-26. If one ground layer is not enough, a second ground plane may be added. When possible, it is important to avoid other devices on-board using the PCB for heat dissipation, like linear regulators, as this would heat the STPC itself and reduce the temperature range of the whole system, In case these devices can not use a separate heat sink, they must not be located just near the STPC Figure 6-26. Ground routing Pad for ground ball Thru hole to ground layer Top Lay er : Sign als Pow er la yer Inte rna l lay er: sign als Bott om Lay er : grou nd laye r Note: For better visibility, ground balls are not all routed. |
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