參數(shù)資料
型號(hào)： STPCI2HEYI
英文描述： PERIPHERAL (MULTIFUNCTION) CONTROLLER
中文描述： 周邊（多功能）控制器
文件頁(yè)數(shù)： 63/71頁(yè)
文件大?。?/td> 1071K
代理商： STPCI2HEYI
BOARD LAYOUT
Issue 2.4 - February 11, 2002
63/69
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
6. BOARD LAYOUT
6.1. THERMAL DISSIPATION
Thermal dissipation of the STPC depends mainly
on supply voltage. When the system does not
need to work at 3.3 V, it may be beneficial to
reduce the voltage to, for example, 3.15 V. This
may save a few 100’s of mW.
A further area to consider is unused interfaces and
functions. Depending on the application, some
input signals can be grounded, some blocks left
un- powered, other blocks shutdown. Clock speed
dynamic adjustment offers a further solution,
together with the integrated power management
unit.
The standard way to route the thermal balls to the
internal ground layer uses one via for each ball
pad, connected using 8-mil wire.
With such a configuration, the Plastic BGA 388
package provides 90% of the thermal dissipation
through the ground balls, in particular the central
thermal balls, as these are directly connected to
the die. The remaining 10% of heat is dissipated
through the case. Adding a heat sink can reduce
this value by 85%.
To avoid thermal problems when routing to the
STPC, some basic rules must be applied.
Firstly, the ground balls must be directly
connected to the ground layer, which acts as a
heat sink. This is illustrated in
Figure 6-1
.
If one ground layer is not enough, a second
ground plane may be added on the solder side.
Figure 6-1. Ground Routing
Pad for ground ball
Thru hole to ground layer
Top Layer : Signals
Ground layer
Power layer
Bottom Layer : signals + local ground layer (if needed)
Note: For better visibility, ground balls are not all routed.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
STPCINDUSTRIAL 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:PC Compatible Embedded Microprocessor
STP-CN04 功能描述:烙鐵 Cartridge Conical 0.4mm (0.016in) RoHS:否 制造商:Weller 產(chǎn)品:Soldering Stations 類型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大溫度:+ 850 F 電纜類型:US Cord Included
STP-CN05 功能描述:烙鐵 Cartridge Conical 0.5mm (0.02in) RoHS:否 制造商:Weller 產(chǎn)品:Soldering Stations 類型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大溫度:+ 850 F 電纜類型:US Cord Included
STP-CN10 功能描述:烙鐵 Cartridge Conical 1mm (0.039in) RoHS:否 制造商:Weller 產(chǎn)品:Soldering Stations 類型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大溫度:+ 850 F 電纜類型:US Cord Included
STP-CNB04 功能描述:烙鐵 Cartridge Conical Bent 0.4mm (0.016in) RoHS:否 制造商:Weller 產(chǎn)品:Soldering Stations 類型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大溫度:+ 850 F 電纜類型:US Cord Included
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