MC9S12A256 Motorola, MC9S12A256 Datasheet - Page 96

• Manufacturer Part Number: MC9S12A256
• Description: MC9S12DT256 Device User Guide V03.03
• Manufacturer: Motorola

MC9S12DT256 Device User Guide — V03.03
The total power dissipation can be calculated from:
Two cases with internal voltage regulator enabled and disabled must be considered:
T J
T A
P D
P INT
JA
1. Internal Voltage Regulator disabled
2. Internal voltage regulator enabled
94
P
For R
respectively
I
additionally contains the current flowing into the external loads with output high.
P
=
DDR
=
=
IO
IO
=
Junction Temperature, [ C
Ambient Temperature, [ C
=
Total Chip Power Dissipation, [W]
is the sum of all output currents on I/O ports associated with VDDX and VDDR.
is the sum of all output currents on I/O ports associated with VDDX and VDDR.
Package Thermal Resistance, [ C/W]
is the current shown in Table A-7 and not the overall current flowing into VDDR, which
DSON
Chip Internal Power Dissipation, [W]
is valid:
P INT
R DSON
=
I DD V DD
P INT
R DSON
=
P IO
P IO
=
V DD5 V OH
----------------------------------- - for outputs driven high
T J
I DDR V DDR
=
P D
+
=
=
=
I OH
V OL
----------- - for outputs driven low
I DDPLL V DDPLL
I
OL
T A
–
=
i
i
P INT
;
R DSON
R DSON
+
P D
;
+
+
P IO
I DDA V DDA
JA
I IO
I IO
i
i
2
2
+
I DDA
V DDA