MC9S12NE64_06 Datasheet, PDF (507/554 Pages) Freescale Semiconductor, Inc – Microcontrollers

Power Dissipation and Thermal Characteristics
Θ_JA = Package Thermal Resistance, [°C/W]
The total power dissipation can be calculated from:
PD = PINT + PIO
PINT = Chip Internal Power Dissipation, [W]
Two cases with internal voltage regulator enabled and disabled must be considered:
1. Internal Voltage Regulator disabled
PINT = IDD ⋅ VDD + IDDPLL ⋅ VDDPLL + IDDA ⋅ VDDA + IDDP_HY ⋅ VDDP_HY + I_DDTX ⋅ V_DDTX
∑ ^{PIO =} _i ^{RDSON ⋅ IIOi2}
Which is the sum of all output currents on I/O ports associated with V_DDX.
For R_DSON is valid: _{RDSON = V--I--O-O----L-L- ;for outputs driven low}
respectively
RDSON = ^{V-----D----D-----3}---I⁽--O-5----⁾_H---^–-----V----O-----H---;for outputs driven high
2. Internal voltage regulator enabled
PINT = IDDR ⋅ VDDR + IDDA ⋅ VDDA + IDD_X ⋅ VDD_X + I_DDTX ⋅ V_DDTX
I_DDX is the current shown in Table A-7 and not the overall current flowing into V_DDX,
which additionally contains the current flowing into the external loads with output high.
∑ ^{PIO =} _i ^{RDSON ⋅ IIOi2}
Which is the sum of all output currents on I/O ports associated with V_DDX.
MC9S12NE64 Data Sheet, Rev. 1.1
Freescale Semiconductor
507