mc9s12ne64 Freescale Semiconductor, Inc, mc9s12ne64 Datasheet - Page 507

• Manufacturer Part Number: mc9s12ne64
• Description: Hcs12 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

The total power dissipation can be calculated from:
Two cases with internal voltage regulator enabled and disabled must be considered:
Freescale Semiconductor
Θ
P
INT
JA
1. Internal Voltage Regulator disabled
2. Internal voltage regulator enabled
=
P
Which is the sum of all output currents on I/O ports associated with V
For R
respectively
I
which 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
=
INT
DDX
Package Thermal Resistance, [°C/W]
Chip Internal Power Dissipation, [W]
P
INT
=
DSON
is the current shown in Table A-7 and not the overall current flowing into V
I
DD
=
⋅
I
DDR
is valid:
V
DD
R DSON
+
⋅
V
I
DDPLL
DDR
R DSON
+
=
I
⋅
DDA
V
V DD3 5 ( ) V OH
------------------------------------------- - for outputs driven high
MC9S12NE64 Data Sheet, Rev. 1.1
P IO
DDPLL
P IO
⋅
=
V
P
DDA
=
D
I OH
V OL
----------- - for outputs driven low
I OL
=
+
∑
=
I
i
∑
DDA
–
+
P
i
;
R DSON
I
DDX
INT
R DSON
⋅
V
DDA
;
⋅
+
V
P
DDX
IO
⋅
+
I IO
⋅
I
I IO
DDPHY
+
i
I
2
DDTX
i
2
Power Dissipation and Thermal Characteristics
⋅
V
⋅
V
DDPHY
DDTX
+
DDX
DDX
I
DDTX
.
.
⋅
V
DDTX
DDX
,
507