參數(shù)資料
型號(hào)： DSP56F805E
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： 16-bit Digital Signal Controllers
中文描述： 16位數(shù)字信號(hào)控制器
文件頁(yè)數(shù)： 50/56頁(yè)
文件大?。?/td> 415K
代理商： DSP56F805E
56F805
Technical Data, Rev. 15
50
Freescale Semiconductor
Part 5 Design Considerations
5.1 Thermal Design Considerations
An estimation of the chip junction temperature, T
J
, in
°
C can be obtained from the equation:
Equation 1:
Where:
T
A
= ambient temperature °C
R
θ
JA
= package junction-to-ambient thermal resistance °C/W
P
D
= power dissipation in package
Historically, thermal resistance has been expressed as the sum of a junction-to-case thermal resistance and
a case-to-ambient thermal resistance:
Equation 2:
Where:
R
θ
JA
= package junction-to-ambient thermal resistance °C/W
R
θ
JC
= package junction-to-case thermal resistance °C/W
R
θ
CA
= package case-to-ambient thermal resistance °C/W
R
θ
JC
is device-related and cannot be influenced by the user. The user controls the thermal environment to
change the case-to-ambient thermal resistance, R
θ
CA
. For example, the user can change the air flow around
the device, add a heat sink, change the mounting arrangement on the Printed Circuit Board (PCB), or
otherwise change the thermal dissipation capability of the area surrounding the device on the PCB. This
model is most useful for ceramic packages with heat sinks; some 90% of the heat flow is dissipated through
the case to the heat sink and out to the ambient environment. For ceramic packages, in situations where
the heat flow is split between a path to the case and an alternate path through the PCB, analysis of the
device thermal performance may need the additional modeling capability of a system level thermal
simulation tool.
The thermal performance of plastic packages is more dependent on the temperature of the PCB to which
the package is mounted. Again, if the estimations obtained from R
θ
JA
do not satisfactorily answer whether
the thermal performance is adequate, a system level model may be appropriate.
Definitions:
A complicating factor is the existence of three common definitions for determining the junction-to-case
thermal resistance in plastic packages:
Measure the thermal resistance from the junction to the outside surface of the package (case) closest to the
chip mounting area when that surface has a proper heat sink. This is done to minimize temperature variation
across the surface.
Measure the thermal resistance from the junction to where the leads are attached to the case. This definition
is approximately equal to a junction to board thermal resistance.
T
J
T
A
P
D
R
θ
JA
×
(
)
+
=
R
θ
JA
R
θ
JC
R
θ
CA
+
=
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DSP56F805EVMUM 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:56F805 Evaluation Module Hardware User＇s Manual
DSP56F805FV80 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC 80Mhz/ 40MIPS RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線(xiàn)寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT
DSP56F805FV80E 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC 80Mhz/40MIPS RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線(xiàn)寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT
DSP56F805FV80E 制造商:Freescale Semiconductor 功能描述:Digital Signal Processor IC DSP Type:Cor
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