參數(shù)資料
型號: MC68HC16S2CPU25
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 16-BIT, 25.17 MHz, MICROCONTROLLER, PQFP100
封裝: TQFP-100
文件頁數(shù): 80/104頁
文件大小: 812K
代理商: MC68HC16S2CPU25
MC68HC16S2
MOTOROLA
MC68HC16S2TS/D
77
Table 41 Thermal Characteristics
Num
Characteristic
Symbol
Value
Unit
1
Thermal Resistance
Plastic 100-Pin Surface Mount
Θ
JA
42.5
°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
+
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÷
=
KP
D
T
A
273
°C
+
() Θ
JA
P
D
2
×
++
=
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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