參數資料
型號: STPCI2HDYI
廠商: STMICROELECTRONICS
元件分類: 外設及接口
英文描述: MULTIFUNCTION PERIPHERAL, PBGA516
封裝: PLASTIC, BGA-516
文件頁數: 3/109頁
文件大?。?/td> 2430K
代理商: STPCI2HDYI
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
相關PDF資料
PDF描述
STPCI2HEYI MULTIFUNCTION PERIPHERAL, PBGA516
STPCI2HDYC MULTIFUNCTION PERIPHERAL, PBGA516
STPIC6C595M 8-BIT RIGHT SERIAL IN PARALLEL OUT SHIFT REGISTER, TRUE OUTPUT, PDSO16
STR710RZT6 32-BIT, FLASH, 66 MHz, RISC MICROCONTROLLER, PQFP144
STUF32864EHLFT SSTU SERIES, POSITIVE EDGE TRIGGERED D FLIP-FLOP, TRUE OUTPUT, PBGA96
相關代理商/技術參數
參數描述
STPCI2HEYC 功能描述:微處理器 - MPU 133MHz x86 SoC RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數據總線寬度:32 bit 最大時鐘頻率:536 MHz 程序存儲器大小:32 KB 數據 RAM 大小:128 KB 接口類型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:FBGA-324
STPCI2HEYI 功能描述:微處理器 - MPU 133MHz x86 SoC RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數據總線寬度:32 bit 最大時鐘頻率:536 MHz 程序存儲器大小:32 KB 數據 RAM 大小:128 KB 接口類型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:FBGA-324
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