mpc5602d Freescale Semiconductor, Inc, mpc5602d Datasheet - Page 25

• Manufacturer Part Number: mpc5602d
• Description: Mpc5602d Microcontroller Data Sheet
• Manufacturer: Freescale Semiconductor, Inc

4.6.2
The average chip-junction temperature, T
Most of the time for the applications, P
is configured to continuously drive external modules and/or memories.
An approximate relationship between P
Therefore, solving equations
4.7
4.7.1
The device provides four main I/O pad types depending on the associated alternate functions:
Medium pads can use slow configuration to reduce electromagnetic emission except for PC[1], that is medium only, at the cost
of reducing AC performance.
Freescale Semiconductor
•
•
•
Where:
Where:
Slow pads—These pads are the most common pads, providing a good compromise between transition time and low
electromagnetic emission.
Medium pads—These pads provide transition fast enough for the serial communication channels with controlled
current to reduce electromagnetic emission.
Input only pads—These pads are associated to ADC channels (ADC_P[X]) providing low input leakage.
I/O pad electrical characteristics
T
R
P
P
P
K is a constant for the particular part, which may be determined from
for a known T
iteratively for any value of T
Power considerations
I/O pad types
A
D
INT
I/O
JA
is the ambient temperature in °C.
is the sum of P
represents the power dissipation on input and output pins; user determined.
is the product of I
is the package junction-to-ambient thermal resistance, in °C/W.
A.
1
Using this value of K, the values of P
and 2:
INT
and P
DD
Preliminary—Subject to Change Without Notice
MPC5602D Microcontroller Data Sheet, Rev. 3.1
I/O
K = P
D
and V
< P
I/O
J
and T
A
, in degrees Celsius, may be calculated using
.
INT
(P
D
DD
D
P
T
J
x (T
and may be neglected. On the other hand, P
D
J
= P
, expressed in watts. This is the chip internal power.
(if P
= T
= K / (T
A
INT
I/O
+ 273 °C) + R
A
+ (P
+ P
is neglected) is given by:
J
I/O
D
+ 273 °C)
).
x R
JA
D
JA
and T
)
x P
J
may be obtained by solving equations
D
2
Equation 3
Equation
I/O
by measuring P
may be significant, if the device
1:
Electrical characteristics
D
(at equilibrium)
1
and
Eqn. 1
Eqn. 2
Eqn. 3
2
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