参数资料
型号: MPC5607BF0AMLU4R
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, FLASH, 48 MHz, MICROCONTROLLER, PQFP176
封装: 24 X 24 MM, ROHS COMPLIANT, LQFP-176
文件页数: 46/110页
文件大小: 907K
代理商: MPC5607BF0AMLU4R
MPC5607B Microcontroller Data Sheet, Rev. 6
Electrical characteristics
Freescale Semiconductor
40
4.5.3
Power considerations
The average chip-junction temperature, TJ, in degrees Celsius, may be calculated using Equation 1:
TJ = TA + (PD x RJA)
Eqn. 1
Where:
TA is the ambient temperature in °C.
RJA is the package junction-to-ambient thermal resistance, in °C/W.
PD is the sum of PINT and PI/O (PD = PINT + PI/O).
PINT is the product of IDD and VDD, expressed in watts. This is the chip internal power.
PI/O represents the power dissipation on input and output pins; user determined.
Most of the time for the applications, PI/O< PINT and may be neglected. On the other hand, PI/O may be significant, if the device
is configured to continuously drive external modules and/or memories.
An approximate relationship between PD and TJ (if PI/O is neglected) is given by:
PD = K / (TJ + 273 °C)
Eqn. 2
Therefore, solving equations 1 and 2:
K = PD x (TA + 273 °C) + RJA x PD
2
Eqn. 3
Where:
RJC CC
Thermal resistance,
junction-to-case5
Single-layer board — 1s
100
23
°C/W
144
23
176
23
Four-layer board — 2s2p
100
19.8
144
19.2
176
18.8
1 Thermal characteristics are targets based on simulation.
2 V
DD = 3.3 V ± 10% / 5.0 V ± 10%, TA = 40 to 125 °C.
3 Junction-to-ambient thermal resistance determined per JEDEC JESD51-3 and JESD51-6. Thermal test board
meets JEDEC specification for this package. When Greek letters are not available, the symbols are typed as RthJA
and RthJMA.
4 Junction-to-board thermal resistance determined per JEDEC JESD51-8. Thermal test board meets JEDEC
specification for the specified package. When Greek letters are not available, the symbols are typed as RthJB.
5 Junction-to-case at the top of the package determined using MIL-STD 883 Method 1012.1. The cold plate
temperature is used for the case temperature. Reported value includes the thermal resistance of the interface
layer. When Greek letters are not available, the symbols are typed as RthJC.
Table 14. LQFP thermal characteristics1 (continued)
Symbol
C
Parameter
Conditions2
Pin count
Value
Unit
Min Typ Max
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