參數(shù)資料
型號： MC68HC705CJ4FB
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP44
封裝： PLASTIC, QFP-44
文件頁數(shù)： 9/114頁
文件大小： 4047K
代理商： MC68HC705CJ4FB
GENERAL RELEASE SPECIFICATION
ELECTRICAL SPECIFICATIONS
MC68HC(7)05CJ4
14-2
Rev. 2.1
1
2
3
4
5
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7
8
9
10
11
12
13
14
15
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20
14.3 Operating Temperature Range
14.4 Thermal Characteristics
14.5 Power Considerations
The average chip junction temperature, TJ, in C can be obtained from:
(1)
where:
TA = ambient temperature in °C
θ
JA = package thermal resistance, junction to ambient in °C/W
PD = PINT + PI/O
PINT = IDD × VDD = chip internal power dissipation
PI/O = power dissipation on input and output pins (user-determined)
For most applications, PI/O
PINT and can be neglected.
Ignoring PI/O, the relationship between PD and TJ is approximately:
(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.
Rating
Symbol
Value
Unit
Operating Temperature Range
MC68HC705CJ4 (Standard)
T
A
T
L to + TH
0 to +70
°C
Characteristic
Symbol
Value
Unit
Thermal Resistance
44-Lead Plastic Quad Flat Pack
θ
JA
170
°C/W
T
J
T
A
P
D
θ
×
JA
()
+
=
P
D
K
T
J
273
°C
+
------------------------------
=
KP
D
T
A
273
°C
θ
JA
P
D
×
+
×
=
F
re
e
sc
a
le
S
e
m
ic
o
n
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to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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