mc9s08qg4 Freescale Semiconductor, Inc, mc9s08qg4 Datasheet - Page 269

• Manufacturer Part Number: mc9s08qg4
• Description: Hcs08 Microcontrollers Microcontroller Family
• Manufacturer: Freescale Semiconductor, Inc

For most applications, P
(if P
Solving
where K is a constant pertaining to the particular part. K can be determined from equation 3 by measuring
P
solving
Freescale Semiconductor
D
(at equilibrium) for a known T
I/O
P
P
int
I/O
is neglected) is:
Equation A-1
Equation A-1
= I
= Power dissipation on input and output pins — user determined
DD
× V
DD
, Watts — chip internal power
and
and
I/O
Equation A-2
Equation A-2
<< P
MC9S08QG8 and MC9S08QG4 Data Sheet, Rev. 4
K = P
int
A
and can be neglected. An approximate relationship between P
. Using this value of K, the values of P
D
P
× (T
D
iteratively for any value of T
for K gives:
= K ÷ (T
A
+ 273°C) + θ
J
+ 273°C)
JA
× (P
D
)
2
A
.
D
Appendix A Electrical Characteristics
and T
J
can be obtained by
D
Eqn. A-2
Eqn. A-3
and T
269
J