mcf51qe32 Freescale Semiconductor, Inc, mcf51qe32 Datasheet - Page 13

• Manufacturer Part Number: mcf51qe32
• Description: Mc9s08qe128 Flexis 8-bit Hcs08 Microcontrollers
• Manufacturer: 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
JA
A
D
Thermal Characteristics
= Ambient temperature, °C
= P
= Package thermal resistance, junction-to-ambient, °C/W
3
int
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
1
+ P
Operating temperature range
(packaged)
Maximum junction temperature
Thermal resistance
Thermal resistance
, the injection current may flow out of V
Depending on packaging.
I/O
Single-layer board
Four-layer board
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
MC9S08QE128 Series Advance Information Data Sheet, Rev. 4
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
Symbol
and could result in external power supply going
× θ
T
θ
θ
θ
θ
T
JM
JA
JA
JA
JA
A
JA
)
DD
(–40 to 85 or 0 to 70)
range during instantaneous and
I/O
into account in power calculations, determine
T
Value
SS
L
95
82
68
81
69
60
54
46
26
50
47
to T
or V
In
> V
H
DD
DD
will be very small.
) is greater than
1
Electrical Characteristics
°C/W
°C/W
°C/W
°C/W
Unit
°C
°C
Eqn. 1
13