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| 型号： | MPC8555CPXAKDX |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 600 MHz, RISC PROCESSOR, PBGA783 |
| 封装： | 29 X 29 MM, 3.75 MM HEIGHT, 1 MM PITCH, FLIP CHIP, PLASTIC, BGA-783 |
| 文件页数： | 69/88页 |
| 文件大小： | 1244K |
| 代理商： | MPC8555CPXAKDX |
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MPC8555E PowerQUICC III Integrated Communications Processor Hardware Specifications, Rev. 4
Freescale Semiconductor
71
Thermal
16.2.2
Internal Package Conduction Resistance
For the packaging technology, shown in Table 49, the intrinsic internal conduction thermal resistance paths
are as follows:
The die junction-to-case thermal resistance
The die junction-to-board thermal resistance
Figure 44 depicts the primary heat transfer path for a package with an attached heat sink mounted to a
printed-circuit board.
Figure 44. Package with Heat Sink Mounted to a Printed-Circuit Board
The heat sink removes most of the heat from the device. Heat generated on the active side of the chip is
conducted through the silicon and through the lid, then through the heat sink attach material (or thermal
interface material), and finally to the heat sink. The junction-to-case thermal resistance is low enough that
the heat sink attach material and heat sink thermal resistance are the dominant terms.
16.2.3
Thermal Interface Materials
A thermal interface material is required at the package-to-heat sink interface to minimize the thermal
contact resistance. For those applications where the heat sink is attached by spring clip mechanism,
Figure 45 shows the thermal performance of three thin-sheet thermal-interface materials (silicone,
graphite/oil, floroether oil), a bare joint, and a joint with thermal grease as a function of contact pressure.
As shown, the performance of these thermal interface materials improves with increasing contact pressure.
The use of thermal grease significantly reduces the interface thermal resistance. The bare joint results in a
thermal resistance approximately six times greater than the thermal grease joint.
Heat sinks are attached to the package by means of a spring clip to holes in the printed-circuit board (see
Figure 41). Therefore, the synthetic grease offers the best thermal performance, especially at the low
interface pressure.
When removing the heat sink for re-work, it is preferable to slide the heat sink off slowly until the thermal
interface material loses its grip. If the support fixture around the package prevents sliding off the heat sink,
External Resistance
Internal Resistance
Radiation
Convection
Radiation
Convection
Heat Sink
Printed-Circuit Board
Thermal Interface Material
Package/Leads
Die Junction
Die/Package
(Note the internal versus external package resistance)
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| MPC8555ECVTAJD | 功能描述:微处理器 - MPU PQ 37 LITE 8555E RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
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