mpc8378e Freescale Semiconductor, Inc, mpc8378e Datasheet - Page 116

• Manufacturer Part Number: mpc8378e
• Description: Powerquicc Ii Pro Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

Thermal
23 Thermal
This section describes the thermal specifications of the MPC8378E.
23.1
Table 77
23.2
For the following sections, P
23.2.1
An estimation of the chip junction temperature, T
116
Junction-to-ambient natural convection on single layer board (1s)
Junction-to-ambient natural convection on four layer board (2s2p)
Junction-to-ambient (at 200 ft/min) on single layer board (1s)
Junction-to-ambient (at 200 ft/min) on four layer board (2s2p)
Junction-to-board thermal
Junction-to-case thermal
Junction-to-package natural convection on top
Note:
1
2
3
4
5
6
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.
Per JEDEC JESD51-2 with the single layer board horizontal. Board meets JESD51-9 specification.
Per JEDEC JESD51-6 with the board horizontal.
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.
Thermal resistance between the die and the case top surface as measured by the cold plate method (MIL SPEC-883 Method
1012.1).
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.
provides the package thermal characteristics for the 689 31 × 31mm TePBGA II package.
Thermal Characteristics
Thermal Management Information
Estimation of Junction Temperature with Junction-to-Ambient
Thermal Resistance
T
where:
MPC8378E PowerQUICC II Pro Processor Hardware Specifications, Rev. 3
J
= T
T
T
R
A
Table 77. Package Thermal Characteristics for TePBGA II
A
J
θ
+ (R
JA
= junction temperature (°C)
= ambient temperature for the package (°C)
Parameter
D
= junction to ambient thermal resistance (°C/W)
θ
= (V
JA
× P
DD
D
)
× I
DD
) + P
I/O
J
, can be obtained from the equation:
where P
I/O
is the power dissipation of the I/O drivers.
Symbol
R
R
R
R
R
R
ψ
θJMA
θJMA
θJB
θJC
θJA
θJA
JT
Value
21
15
16
12
8
6
6
Freescale Semiconductor
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
Unit
Notes
1, 2, 3
1, 2
1, 3
1, 3
4
5
6