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參數資料
型號: MC68HC05C8A
廠商: Motorola, Inc.
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數: 123/158頁
文件大小: 773K
代理商: MC68HC05C8A
Electrical Specifications
Thermal Characteristics
MC68HC05C8A
MC68HCL05C8A
MC68HSC05C8A
Rev. 5.0
Technical Data
MOTOROLA
Electrical Specifications
123
13.5 Thermal Characteristics
13.6 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.
Following is an approximate relationship between P
D
and T
J
(neglecting
P
I/O
):
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
.
Characteristic
Symbol
Value
Unit
Thermal resistance
Plastic dual in-line package
Plastic leaded chip carrier (PLCC)
Quad flat pack (QFP0)
Plastic shrink DIP (SDIP)
θ
JA
60
70
95
60
°
C/W
相關PDF資料
PDF描述
MC68HC05C9A 8-Bit Microcontroller(8位微控制器)
MC68HCL05C9A 8-Bit Microcontroller(8位微控制器)
MC68HSC05C9A 8-Bit Microcontroller(8位微控制器)
MC68HC05F2 8-Bit Microcontroller Units (MCU).(8位微控制器)
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相關代理商/技術參數
參數描述
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