mc68hc705v12 Freescale Semiconductor, Inc, mc68hc705v12 Datasheet - Page 232

• Manufacturer Part Number: mc68hc705v12
• Description: M68hc05-based Mcu Hc05 Freescale Semiconductor
• Manufacturer: Freescale Semiconductor, Inc

Electrical Specifications
17.5 Power Considerations
Advance Information
The average chip junction temperature, T
Where:
For most applications, P
Ignoring P
Solving equations (1) and (2) for K gives:
where K is a constant pertaining to the particular part. K can be
determined from equation (3) by measuring P
known T
by solving equations (1) and (2) iteratively for any value of T
Freescale Semiconductor, Inc.
T
P
P
P
JA
A
D
INT
I/O
For More Information On This Product,
= ambient temperature in C
= P
= package thermal resistance, junction to ambient in C/W
= power dissipation on input and output pins (user-determined)
A
= I
. Using this value of K, the values of P
INT
I/O
CC
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, the relationship between P
= P
+ P
Electrical Specifications
V
D
I/O
CC
x (T
T
= chip internal power dissipation
P
J
D
A
= T
I/O
+ 273 C) +
=
A
T
+ (P
J
P
+ 273 C
INT
D
K
and can be neglected.
x
JA
JA
)
x (P
D
J
, in C can be obtained from:
and T
D
D
)
D
2
(at equilibrium) for a
MC68HC705V12
and T
J
is approximately:
J
can be obtained
A
.
—
Rev. 3.0
(1)
(2)
(3)