參數(shù)資料
型號(hào)： MPC8271ZQTMFA
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 6/61頁(yè)
文件大小： 0K
描述： IC MPU POWERQUICC II 516-PBGA
標(biāo)準(zhǔn)包裝： 40
系列： MPC82xx
處理器類(lèi)型： 32-位 MPC82xx PowerQUICC II
速度： 400MHz
電壓： 1.5V
安裝類(lèi)型： 表面貼裝
封裝/外殼： 516-BBGA
供應(yīng)商設(shè)備封裝： 516-FPBGA（27x27）
包裝： 托盤(pán)
MPC8272 PowerQUICC II Family Hardware Specifications, Rev. 3
14
Freescale Semiconductor
Thermal Characteristics
4
Thermal Characteristics
This table describes thermal characteristics. See Table 2 for information on a given SoC’s package.
Discussions of each characteristic are provided in Section 4.1, “Estimation with Junction-to-Ambient
Thermal Resistance,” through Section 4.7, “References.” For the these discussions, PD =(VDD × IDD) +
PI/O, where PI/O is the power dissipation of the I/O drivers.
4.1
Estimation with Junction-to-Ambient Thermal Resistance
An estimation of the chip junction temperature, TJ, in C can be obtained from the following equation:
TJ = TA + (RθJA × PD)
where:
TA = ambient temperature (C)
RθJA = package junction-to-ambient thermal resistance (C/W)
PD = power dissipation in package
The junction-to-ambient thermal resistance is an industry standard value that provides a quick and easy
estimation of thermal performance. However, the answer is only an estimate; test cases have demonstrated
that errors of a factor of two (in the quantity TJ – TA) are possible.
4 MPC8280, MPC8275VR, MPC8275ZQ only.
Table 7. Thermal Characteristics
Characteristic
Symbol
Value
Unit
Air Flow
Junction-to-ambient—
single-layer board1
1 Assumes no thermal vias
RθJA
27
°C/W
Natural convection
21
1 m/s
Junction-to-ambient—
four-layer board
RθJA
19
°C/W
Natural convection
16
1 m/s
Junction-to-board2
2 Thermal resistance between the die and the printed circuit board per JEDEC JESD51-8. Board temperature is
measured on the top surface of the board near the package.
RθJB
11
°C/W
—
Junction-to-case3
3 Thermal resistance between the die and the case top surface as measured by the cold plate method (MIL SPEC-883
Method 1012.1).
RθJC
8
°C/W
—
Junction-to-package top4
4 Thermal characterization parameter indicating the temperature difference between package top and the junction
temperature per JEDEC JESD51-2. When Greek letters are not available, the thermal characterization parameter is
written as Psi-JT.
RθJT
2
°C/W
—
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