MC9S08QE128 FREESCALE [Freescale Semiconductor, Inc], MC9S08QE128 Datasheet - Page 13

• Manufacturer Part Number: MC9S08QE128
• Description: 8-Bit HCS08 Central Processor Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

3.4
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:
Freescale Semiconductor
T
θ
P
P
P
A
JA
D
int
I/O
Thermal Characteristics
= Ambient temperature, °C
= P
= Package thermal resistance, junction-to-ambient, °C/W
= I
= Power dissipation on input and output pins — user determined
3
int
DD
Power supply must maintain regulation within operating V
operating maximum current conditions. If positive injection current (V
I
out of regulation. Ensure external V
current. This will be the greatest risk when the MCU is not consuming power. Examples are: if
no system clock is present, or if the clock rate is very low (which would reduce overall power
consumption).
DD
+ P
× V
, the injection current may flow out of V
Operating temperature range
(packaged)
Maximum junction temperature
Thermal resistance
Thermal resistance
I/O
DD
Single-layer board
Four-layer board
, Watts — chip internal power
MC9S08QE128 Series Advance Information Data Sheet, Rev. 3
32-pin LQFP
44-pin LQFP
48-pin QFN
64-pin LQFP
80-pin LQFP
32-pin LQFP
44-pin LQFP
48-pin QFN
64-pin LQFP
80-pin LQFP
Rating
J
) in °C can be obtained from:
Table 5. Thermal Characteristics
SS
T
J
or V
= T
DD
A
DD
load will shunt current greater than maximum injection
+ (P
and multiply by the pin current for each I/O pin. Except in cases of
DD
D
and could result in external power supply going
Symbol
× θ
T
θ
θ
θ
θ
T
JM
JA
JA
JA
JA
JA
A
)
DD
I/O
range during instantaneous and
into account in power calculations, determine
–40 to 85
T
SS
Value
L
95
82
69
81
69
60
54
47
26
50
47
to T
In
or V
> V
H
DD
DD
will be very small.
) is greater than
°C/W
°C/W
°C/W
°C/W
Electrical Characteristics
Unit
°C
°C
Eqn. 1
13