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參數(shù)資料
| 型號： | KMPC860DEZQ80D4 |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 4/78頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MPU POWERQUICC 80MHZ 357-PBGA |
| 標準包裝： | 2 |
| 系列： | MPC8xx |
| 處理器類型： | 32-位 MPC8xx PowerQUICC |
| 速度： | 80MHz |
| 電壓： | 3.3V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 357-BBGA |
| 供應商設備封裝： | 357-PBGA（25x25） |
| 包裝： | 托盤 |
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MPC860 PowerQUICC Family Hardware Specifications, Rev. 9
12
Freescale Semiconductor
Thermal Calculation and Measurement
7
Thermal Calculation and Measurement
For the following discussions, PD = (VDD × IDD) + PI/O, where PI/O is the power dissipation of the I/O
drivers.
7.1
Estimation with Junction-to-Ambient Thermal Resistance
An estimation of the chip junction temperature, T
J, in C can be obtained from the 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 which 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.
7.2
Estimation with Junction-to-Case Thermal Resistance
Historically, the thermal resistance has frequently been expressed as the sum of a junction-to-case thermal
resistance and a case-to-ambient thermal resistance:
RθJA = RθJC + RθCA
where:
RθJA = junction-to-ambient thermal resistance (C/W)
RθJC = junction-to-case thermal resistance (C/W)
RθCA = case-to-ambient thermal resistance (C/W)
RθJC is device related and cannot be influenced by the user. The user adjusts the thermal environment to
affect the case-to-ambient thermal resistance, RθCA. For instance, the user can change the airflow around
the device, add a heat sink, change the mounting arrangement on the printed-circuit board, or change the
thermal dissipation on the printed-circuit board surrounding the device. This thermal model is most useful
for ceramic packages with heat sinks where some 90% of the heat flows through the case and the heat sink
to the ambient environment. For most packages, a better model is required.
7.3
Estimation with Junction-to-Board Thermal Resistance
A simple package thermal model which has demonstrated reasonable accuracy (about 20%) is a
two-resistor model consisting of a junction-to-board and a junction-to-case thermal resistance. The
junction-to-case thermal resistance covers the situation where a heat sink is used or where a substantial
amount of heat is dissipated from the top of the package. The junction-to-board thermal resistance
describes the thermal performance when most of the heat is conducted to the printed-circuit board. It has
been observed that the thermal performance of most plastic packages, especially PBGA packages, is
strongly dependent on the board temperature; see Figure 2.
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