mc9s08mp16 Freescale Semiconductor, Inc, mc9s08mp16 Datasheet - Page 10

• Manufacturer Part Number: mc9s08mp16
• Description: 8-bit Hcs08 Central Processor Unit Cpu
• Manufacturer: Freescale Semiconductor, Inc

Electrical Characteristics
2.4
This section provides information about operating temperature range, power dissipation, and package thermal resistance. Power
dissipation on I/O pins is usually small compared to the power dissipation in on-chip logic and voltage regulator circuits, and
it is user-determined rather than being controlled by the MCU design. To take P
the difference between actual pin voltage and V
unusually high pin current (heavy loads), the difference between pin voltage and V
The average chip-junction temperature (T
where:
For most applications, P
is:
Solving
10
1
2
Junction temperature is a function of die size, on-chip power dissipation, package thermal resistance, mounting site (board)
temperature, ambient temperature, air flow, power dissipation of other components on the board, and board thermal
resistance.
Junction-to-ambient natural convection
Num
1
2
3
4
Equation 1
T
θ
P
P
P
JA
A
D
int
I/O
Thermal Characteristics
—
= Ambient temperature, °C
= P
D
D
D
C
= Package thermal resistance, junction-to-ambient, °C/W
= I
= Power dissipation on input and output pins — user determined
int
DD
Operating temperature range (packaged)
Maximum junction temperature
Thermal resistance
single-layer board
Thermal resistance
four-layer board
+ P
× V
and
I/O
DD
I/O
Equation 2
, Watts — chip internal power
<< P
48-pin LQFP
32-pin LQFP
28-pin SOIC
48-pin LQFP
32-pin LQFP
28-pin SOIC
int
and can be neglected. An approximate relationship between P
Rating
for K gives:
1,2
1,2
K = P
J
MC9S08MP16 Series Data Sheet, Rev. 1
) in °C can be obtained from:
Table 4. Thermal Characteristics
D
P
SS
T
× (T
D
J
or V
= K ÷ (T
= T
A
+ 273°C) + θ
A
DD
+ (P
and multiply by the pin current for each I/O pin. Except in cases of
J
+ 273°C)
D
Symbol
× θ
θ
θ
T
T
JA
JA
JA
A
J
JA
)
× (P
D
I/O
)
Consumer &
2
–40 to 105
Industrial
into account in power calculations, determine
115
SS
80
85
71
56
57
48
or V
DD
will be very small.
D
and T
Automotive
–40 to 125
Freescale Semiconductor
135
J
80
56
—
—
—
—
(if P
I/O
is neglected)
°C/W
°C/W
Unit
Eqn. 1
Eqn. 2
Eqn. 3
°C
°C