MC9S12Q FREESCALE [Freescale Semiconductor, Inc], MC9S12Q Datasheet - Page 604

• Manufacturer Part Number: MC9S12Q
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Appendix A Electrical Characteristics
A.1.8
Power dissipation and thermal characteristics are closely related. The user must assure that the maximum
operating junction temperature is not exceeded. The average chip-junction temperature (T
obtained from:
The total power dissipation can be calculated from:
Two cases with internal voltage regulator enabled and disabled must be considered:
604
1. Internal Voltage Regulator disabled
2. Internal voltage regulator enabled
P
P
T
T
T
P
J
J
A
D
INT
D
JA
Which is the sum of all output currents on I/O ports associated with V
For R
respectively
I
additionally contains the current flowing into the external loads with output high.
Which is the sum of all output currents on I/O ports associated with V
DDR
=
=
=
=
=
=
T
Junction Temperature, [ C
Ambient Temperature, [ C
=
P
R
Total Chip Power Dissipation, [W]
R
P
P
P
P
Power Dissipation and Thermal Characteristics
A
Package Thermal Resistance, [ C/W]
INT
IO
INT
IO
DSON
INT
DSON
is the current shown in
Chip Internal Power Dissipation, [W]
DSON
+
=
=
P
+
=
=
D
P
is valid:
I
I
i
IO
i
=
=
DDR
DD
R
R
V
----------- - for outputs driven low
V
----------------------------------- - for outputs driven high
I
JA
OL
DSON
DSON
OL
DD5
V
DD
V
I
;
OH
DDR
–
+
V
I
I
I
OH
IO i
IO i
DDPLL
+
I
2
2
;
DDA
Table A-8
V
V
DDPLL
DDA
MC9S12Q128
and not the overall current flowing into VDDR, which
Rev 1.09
+
I
DDA
V
DDA
DDX
DDX
and V
and V
Freescale Semiconductor
DDM
DDR
J
) in C can be
.
.