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1500457 Datasheet(PDF) 75 Page - Freescale Semiconductor, Inc |
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1500457 Datasheet(HTML) 75 Page - Freescale Semiconductor, Inc |
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75 / 87 page  MPC8349EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 13 Freescale Semiconductor 75 Thermal 20.2 Thermal Management Information For the following sections, PD = (VDD × IDD) + PI/O where PI/O is the power dissipation of the I/O drivers. See Table 5 for I/O power dissipation values. 20.2.1 Estimation of Junction Temperature with Junction-to-Ambient Thermal Resistance An estimation of the chip junction temperature, TJ, can be obtained from the equation: TJ = TA + (RθJA × PD) where: TJ = junction temperature (°C) TA = ambient temperature for the package (°C) RθJA = junction-to-ambient thermal resistance (°C/W) PD = power dissipation in the package (W) The junction-to-ambient thermal resistance is an industry-standard value that provides a quick and easy estimation of thermal performance. Generally, the value obtained on a single-layer board is appropriate for a tightly packed printed-circuit board. The value obtained on the board with the internal planes is usually appropriate if the board has low power dissipation and the components are well separated. Test cases have demonstrated that errors of a factor of two (in the quantity TJ –TA) are possible. 20.2.2 Estimation of Junction Temperature with Junction-to-Board Thermal Resistance The thermal performance of a device cannot be adequately predicted from the junction-to-ambient thermal resistance. The thermal performance of any component is strongly dependent on the power dissipation of surrounding components. In addition, the ambient temperature varies widely within the application. For many natural convection and especially closed box applications, the board temperature at the perimeter Junction-to-package natural convection on top ψ JT 1 °C/W 6 Notes: 1. Junction temperature is a function of die size, on-chip power dissipation, package thermal resistance, mounting site (board) temperature, ambient temperature, air flow, power dissipation of other components on the board, and board thermal resistance. 2. Per SEMI G38-87 and JEDEC JESD51-2 with the single-layer board horizontal. 3. Per JEDEC JESD51-6 with the board horizontal, 1 m/s is approximately equal to 200 linear feet per minute (LFM). 4. 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. 5. Thermal resistance between the die and the case top surface as measured by the cold plate method (MIL SPEC-883 Method 1012.1). 6. 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. Table 63. Package Thermal Characteristics for TBGA (continued) Characteristic Symbol Value Unit Notes |
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