参数资料
型号: KMC7448VU1700LD
厂商: Freescale Semiconductor
文件页数: 41/60页
文件大小: 0K
描述: IC MPU 128BIT 1700MHZ 360-FCCBGA
标准包装: 1
系列: MPC74xx
处理器类型: 32-位 MPC74xx PowerPC
速度: 1.7GHz
电压: 1.3V
安装类型: 表面贴装
封装/外壳: 360-CBGA,FCCBGA
供应商设备封装: 360-FCCBGA(25x25)
包装: 托盘
MPC7448 RISC Microprocessor Hardware Specifications, Rev. 4
46
Freescale Semiconductor
System Design Information
9.7
Power and Thermal Management Information
This section provides thermal management information for the high coefficient of thermal expansion
(HCTE) package for air-cooled applications. Proper thermal control design is primarily dependent on the
system-level design—the heat sink, airflow, and thermal interface material. The MPC7448 implements
several features designed to assist with thermal management, including DFS and the temperature diode.
DFS reduces the power consumption of the device by reducing the core frequency; see Section 9.7.5.1,
“Power Consumption with DFS Enabled,for specific information regarding power reduction and DFS.
The temperature diode allows an external device to monitor the die temperature in order to detect excessive
temperature conditions and alert the system; see Section 9.7.4, “Temperature Diode,for more
information.
To reduce the die-junction temperature, heat sinks may be attached to the package by several
methods—spring clip to holes in the printed-circuit board or package, and mounting clip and screw
assembly (see Figure 22); however, due to the potential large mass of the heat sink, attachment through the
printed-circuit board is suggested. In any implementation of a heat sink solution, the force on the die
should not exceed ten pounds (45 Newtons).
Figure 22. BGA Package Exploded Cross-Sectional View with Several Heat Sink Options
NOTE
A clip on heat sink is not recommended for LGA because there may not be
adequate clearance between the device and the circuit board. A through-hole
solution is recommended, as shown in Figure 23.
Thermal
Heat Sink
HCTE BGA Package
Heat Sink
Clip
Printed-Circuit Board
Interface Material
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