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| 型號： | STPCI2HEYI |
| 英文描述： | PERIPHERAL (MULTIFUNCTION) CONTROLLER |
| 中文描述： | 周邊（多功能）控制器 |
| 文件頁數(shù)： | 65/71頁 |
| 文件大小： | 1071K |
| 代理商： | STPCI2HEYI |
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BOARD LAYOUT
Issue 2.4 - February 11, 2002
65/69
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
The PBGA Package also dissipates heat through
the peripheral ground balls. When a heat sink is
placed on the device, heat is more uniformly
spread throughout the moulding, increasing the
dissipation of heat through the peripheral ground
balls.
The higher the number of via pads connected to
each ground ball, the higher the amount of heat
dissipated. The only limitation is the risk of losing
routing channels.
Figure 6-1
shows a routing with a good trade off
between thermal dissipation and the number of
routing channels.
A local ground plane on the opposite side of the
board, as shown in
Figure 6-2
, improves thermal
dissipation. It is used to connect decoupling
capacitors but can also be used for connection to
a heat sink or to the system metal box for better
dissipation.
This possibility of using the whole system box for
thermal dissipation can be very useful in cases of
high internal temperature and low external
temperature. In such cases, both sides of the
PBGA should be thermally connected to the metal
chassis in order to propagate the heat flow
through the metal.
Figure 6-3
illustrates a typical
example.
Figure 6-4. Optimum Layout for Central Ground Ball
Via to Ground layer
hole diameter = 14 mil
Pad for ground ball
diameter = 25 mil
connections = 10 mil
Clearance = 6mil
External diameter = 37 mil
Solder mask
diameter = 33 mil
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