參數(shù)資料
型號： STPCI2HEYI
廠商： STMICROELECTRONICS
元件分類： 外設(shè)及接口
英文描述： MULTIFUNCTION PERIPHERAL, PBGA516
封裝： PLASTIC, BGA-516
文件頁數(shù)： 3/109頁
文件大小： 2430K
代理商： STPCI2HEYI
STPC ATLAS
100/109
Issue 1.1 - March 23, 2004
When considering thermal dissipation, one of the
most
important
parts
of
the
layout
is
the
connection between the ground balls and the
ground layer.
A 1-wire connection is shown in Figure 5-1. The
use of a 8-mil wire results in a thermal resistance
of 105°C/W assuming copper is used (418 W/
m.°K). This high value is due to the thickness (34
m) of the copper on the external side of the PCB.
Considering only the central matrix of 36 thermal
balls and one via for each ball, the global thermal
resistance
is
2.9°C/W.
This
can
be
easily
improved using four 12.5 mil wires to connect to
the four vias around the ground pad link as in
Figure 6-33. This gives a total of 49 vias and a
global resistance for the 36 thermal balls of 0.5°C/
W.
The use of a ground plane like in Figure 6-34 is
even better.
Figure 6-32. Recommended 1-wire Power/Ground Pad Layout
Solder Mask (4 mil)
Pad for ground ball (diameter = 25 mil)
Hole to ground layer (diameter = 12 mil)
Connection Wire (width = 12.5 mil)
Via (diameter = 24 mil)
34
.5
mi
l
1 mil = 0.0254 mm
Figure 6-33. Recommended 4-wire Ground Pad Layout
4 via pads for each ground ball
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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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