MC9S08QE32_09 FREESCALE [Freescale Semiconductor, Inc], MC9S08QE32_09 Datasheet - Page 11

• Manufacturer Part Number: MC9S08QE32_09
• Description: 8-Bit HCS08 Central Processor Unit (CPU)
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

The average chip-junction temperature (T
where:
T
θ
P
P
P
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
JA
A
D
int
I/O
D
= Ambient temperature, °C
= P
(at equilibrium) for a known T
= Package thermal resistance, junction-to-ambient, °C/W
= I
I/O
= Power dissipation on input and output pins — user determined
int
DD
is neglected) is:
Equation 1
Equation 1
+ P
× V
I/O
DD
, Watts — chip internal power
Operating temperature range
(packaged)
Maximum junction temperature
Thermal resistance
Thermal resistance
and
and
Single-layer board
Four-layer board
Equation 2
I/O
Equation 2
48-pin QFN
44-pin LQFP
32-pin LQFP
28-pin SOIC
48-pin QFN
44-pin LQFP
32-pin LQFP
28-pin SOIC
<< P
Rating
int
K = P
MC9S08QE32 Series MCU Data Sheet, Rev. 6
A
and can be neglected. An approximate relationship between P
iteratively for any value of T
. Using this value of K, the values of P
for K gives:
Table 4. Thermal Characteristics
D
P
T
× (T
D
J
J
= K ÷ (T
) in °C can be obtained from:
= T
A
+ 273°C) + θ
A
+ (P
J
+ 273°C)
D
Symbol
× θ
T
θ
θ
T
JM
JA
JA
JA
A
JA
)
× (P
D
A
)
.
2
–40 to 85
T
Value
L
95
81
68
66
57
26
46
54
42
to T
H
D
and T
J
°C/W
°C/W
Electrical Characteristics
Unit
can be obtained by
°C
°C
D
and T
Eqn. 1
Eqn. 2
Eqn. 3
11
J