MC9S12DT256 Device User Guide — V03.07
94
The total power dissipation can be calculated from:
Two cases with internal voltage regulator enabled and disabled must be considered:
1.
Internal Voltage Regulator disabled
P
IO
is the sum of all output currents on I/O ports associated with VDDX and VDDR.
For R
DSON
is valid:
respectively
2.
Internal voltage regulator enabled
I
DDR
is the current shown in
and not the overall current flowing into VDDR, which
additionally contains the current flowing into the external loads with output high.
P
IO
is the sum of all output currents on I/O ports associated with VDDX and VDDR.
T
J
T
A
P
D
Θ
JA
•
(
)
+
=
T
J
Junction Temperature, [
°
C
]
=
T
A
Ambient Temperature, [
°
C
]
=
P
D
Total Chip Power Dissipation, [W]
=
Θ
JA
Package Thermal Resistance, [
°
C/W]
=
P
D
P
INT
P
IO
+
=
P
INT
Chip Internal Power Dissipation, [W]
=
P
INT
I
DD
V
DD
⋅
I
DDPLL
V
DDPLL
⋅
I
DDA
+
V
DDA
⋅
+
=
P
IO
R
DSON
i
∑
I
IO
i
2
⋅
=
R
DSON
V
OL
I
OL
------------ for outputs driven low
;
=
R
DSON
V
DD5
V
OH
–
I
OH
------------------------------------ for outputs driven high
;
=
P
INT
I
DDR
V
DDR
⋅
I
DDA
V
DDA
⋅
+
=
P
IO
R
DSON
i
∑
I
IO
i
2
⋅
=
Содержание MC9S12A256
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