參數(shù)資料
型號: MC68CK338CPV14
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 14.4 MHz, MICROCONTROLLER, PQFP144
封裝: PLASTIC, TQFP-144
文件頁數(shù): 16/133頁
文件大?。?/td> 944K
代理商: MC68CK338CPV14
MOTOROLA
MC68CK338
112
MC68CK338TS/D
Table 68 Thermal Characteristics
Num
Characteristic
Symbol
Value
Unit
1
Thermal Resistance
Plastic 144-Pin Surface Mount
Θ
JA
48
°C/W
The average chip-junction temperature (TJ) in C can be obtained from:
(1)
where:
TA
= Ambient Temperature,
°C
Θ
JA
= Package Thermal Resistance, Junction-to-Ambient,
°C/W
PD
= PINT + PI/O
PINT
= IDD × VDD, Watts — Chip Internal Power
PI/O
= Power Dissipation on Input and Output Pins — User Determined
For most applications PI/O < PINT and can be neglected. An approximate relationship between
PD and TJ (if PI/O is neglected) is:
(2)
Solving equations 1 and 2 for K gives:
(3)
where K is a constant pertaining to the particular part. K can be determined from equation (3)
by measuring PD (at equilibrium) for a known TA. Using this value of K, the values of PD and TJ
can be obtained by solving equations (1) and (2) iteratively for any value of TA.
T
J
T
A
P
D
Θ
JA
×
()
+
=
P
D
KT
J
273
°C
+
()
÷
=
KP
D
T
A
273
°C
+
() Θ
JA
P
D
2
×
++
=
F
re
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sc
a
le
S
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I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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