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參數(shù)資料
型號: MC68HC05P18A
廠商: Motorola, Inc.
英文描述: Low Cost HCMOS Microcontroller(低成本、8位HCMOS微控制器)
中文描述: 低成本HCMOS微控制器(低成本,8位HCMOS微控制器)
文件頁數(shù): 117/130頁
文件大小: 1200K
代理商: MC68HC05P18A
Electrical Specifications
Power Considerations
MC68HC05P18A
Technical Data
MOTOROLA
Electrical Specifications
117
L
G
R
13.5 Power Considerations
The average chip junction temperature, T
J
, in
°
C can be obtained from:
T
J
= T
A
+ (P
D
x
θ
JA
)
(1)
Where:
T
A
= ambient temperature in
°
C
θ
JA
= package thermal resistance, junction to ambient in
°
C/W
P
D
= P
INT
+ P
I/O
P
INT
= I
CC
×
V
CC
= chip internal power dissipation
P
I/O
= power dissipation on input and output pins (user-determined)
For most applications, P
I/O
P
INT
and can be neglected.
Ignoring P
I/O
, the relationship between P
D
and T
J
is approximately:
K
(2)
Solving equations (1) and (2) for K gives:
= P
D
x (T
A
+ 273
°
C) +
θ
JA
x (P
D
)
2
(3)
where K is a constant pertaining to the particular part. K can be
determined from equation (3) by measuring P
D
(at equilibrium) for a
known T
A
. Using this value of K, the values of P
D
and T
J
can be obtained
by solving equations (1) and (2) iteratively for any value of T
A
.
P
D
=
T
J
+ 273
°
C
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