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參數資料
型號: MC68HC05C9A
廠商: Motorola, Inc.
元件分類: 8位微控制器
英文描述: 8-Bit Microcontroller(8位微控制器)
中文描述: 8位微控制器(8位微控制器)
文件頁數: 122/160頁
文件大小: 783K
代理商: MC68HC05C9A
L
G
R
Electrical Specifications
General Release Specification
MC68HC05C9A
Rev. 4.0
122
Electrical Specifications
MOTOROLA
12.5 Power Considerations
The average chip-junction temperature, T
J
, in
°
C, can be obtained from:
T
J
= T
A
+ (P
D
×
θ
JA
)
(1)
where:
T
A
= Ambient temperature,
°
C
θ
JA
= Package thermal resistance, junction to ambient,
°
C/W
P
D
= P
INT
+ P
I
/
O
P
INT
= I
DD
×
V
DD
watts (chip internal power)
P
I
/
O
= Power dissipation on input and output pins (user determined)
For most applications P
I
/
O
P
INT
and can be neglected.
The following is an approximate relationship between P
D
and T
J
(neglecting P
J
):
P
D
= K
÷
(T
J
+ 273
°
C)
(2)
Solving equations (1) and (2) for K gives:
K = P
D
×
(T
A
+ 273
°
C) +
θ
JA
×
(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
.
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參數描述
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