参数资料
型号: STPCI2HEYI
厂商: STMICROELECTRONICS
元件分类: 外设及接口
英文描述: MULTIFUNCTION PERIPHERAL, PBGA516
封装: PLASTIC, BGA-516
文件页数: 3/109页
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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相关代理商/技术参数
参数描述
STPCINDUSTRIAL 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:PC Compatible Embedded Microprocessor
STP-CN04 功能描述:烙铁 Cartridge Conical 0.4mm (0.016in) RoHS:否 制造商:Weller 产品:Soldering Stations 类型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大温度:+ 850 F 电缆类型:US Cord Included
STP-CN05 功能描述:烙铁 Cartridge Conical 0.5mm (0.02in) RoHS:否 制造商:Weller 产品:Soldering Stations 类型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大温度:+ 850 F 电缆类型:US Cord Included
STP-CN10 功能描述:烙铁 Cartridge Conical 1mm (0.039in) RoHS:否 制造商:Weller 产品:Soldering Stations 类型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大温度:+ 850 F 电缆类型:US Cord Included
STP-CNB04 功能描述:烙铁 Cartridge Conical Bent 0.4mm (0.016in) RoHS:否 制造商:Weller 产品:Soldering Stations 类型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大温度:+ 850 F 电缆类型:US Cord Included