參數(shù)資料
型號(hào): MC68HC05F4FB
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 1.789 MHz, MICROCONTROLLER, PQFP44
封裝: QFP-44
文件頁數(shù): 129/130頁
文件大?。?/td> 2089K
代理商: MC68HC05F4FB
MOTOROLA
10-2
MC68HC05F4
ELECTRICAL SPECIFICATIONS
10
10.2
Thermal characteristics and power considerations
The average chip junction temperature, TJ, in degrees Celsius can be obtained from the following
equation:
where:
TA = Ambient Temperature (°C)
θ
JA = Package Thermal Resistance,
Junction-to-ambient (
°C/W)
PD = PINT + PI/O (W)
PINT = Internal Chip Power = IDD VDD (W)
PI/O = Power Dissipation on Input and Output pins (User determined)
An approximate relationship between PD and TJ (if PI/O is neglected) is:
Solving equations [1] and [2] for K gives:
where K is a constant for a particular part. K can be determined by measuring PD (at equilibrium)
for a known TA. Using this value of K, the values of PD and TJ can be obtained for any value of TA
by solving the above equations. The package thermal characteristics are shown in Table 10-2.
Table 10-2 Package thermal characteristics
Characteristics
Symbol
Value
Unit
Thermal resistance
44-pin QFP package
28-pin SOIC package
28 pin PDIP package
θ
JA
60
°C/W
T
J
T
A
P
D
θ
JA
()
+
=
P
D
K
T
J
273
+
----------------------
=
KP
D
T
A
273
+
()
θ
JA
P
D
2
+
=
TPG
94
05F4Book Page 2 Tuesday, August 5, 1997 1:10 pm
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