参数资料
型号: MPC5646CCF0CLU8R
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, FLASH, 80 MHz, MICROCONTROLLER, PQFP176
封装: 24 X 24 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, LQFP-176
文件页数: 55/115页
文件大小: 783K
代理商: MPC5646CCF0CLU8R
MPC5646C Microcontroller Datasheet, Rev. 4
Preliminary—Subject to Change Without Notice
Electrical Characteristics
Freescale Semiconductor
44
4.5
Thermal characteristics
4.5.1
Package thermal characteristics
4.5.2
Power considerations
The average chip-junction temperature, TJ, in degrees Celsius, may be calculated using Equation 1:
TJ = TA + (PD 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.
Table 11. LQFP thermal characteristics1
1 Thermal characteristics are targets based on simulation that are subject to change per device characterization.
Symbol
C
Parameter
Conditions2
2 V
DD = 3.3 V ± 10% / 5.0 V ± 10%, TA = 40 to 125 °C.
Pin count
Value3
3 All values need to be confirmed during device validation.
Unit
Typ
Max
RJA
CC
D
Thermal resistance,
junction-to-ambient
natural convection4
4 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.
Single-layer
board—1s
176
385
5 Junction-to-Ambient thermal resistance determined per JEDEC JESD51-3 and JESD51-6.
°C/W
208
416
6 Junction-to-Ambient thermal resistance determined per JEDEC JESD51-2 and JESD51-6
°C/W
RJA
CC
D
Thermal resistance,
junction-to-ambient
natural convection7
Four-layer
board—2s2p7
7 Junction-to-Board thermal resistance determined per JEDEC JESD51-8.
176
31
°C/W
208
34
°C/W
Table 12. 256 MAPBGA thermal characteristics1
1 Thermal characteristics are targets based on simulation that are subject to change per device characterization.
Symbol
C
Parameter
Conditions
Value
Unit
RJA CC — Thermal resistance, junction-to-ambient
natural convection
Single-layer board—1s
432
2 Junction-to-ambient thermal resistance determined per JEDEC JESD51-2 with the single layer board horizontal.
Board meets JESD51-9 specification.
°C/W
Four-layer board—2s2p
263
3 Junction-to-ambient thermal resistance determined per JEDEC JESD51-6 with the board horizontal.
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