MC9S12DT256C View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

MFG CO.

MC9S12DT256C

device made up of standard HCS12 blocks and the HCS12 processor core

Freescale Semiconductor 

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MC9S12DP256B Device User GFuirdeee—scV0a2.l1e5 Semiconductor, Inc.

TJ = TA + (PD • ΘJA)

TJ = Junction Temperature, [°C ]

TA = Ambient Temperature, [°C ]

PD = Total Chip Power Dissipation, [W]

ΘJA = 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

∑ PIO = i RDSON ⋅ IIOi2

PIO is the sum of all output currents on I/O ports associated with VDDX and VDDR.

For RDSON is valid:

RDSON = V--I--O-O----L-L--;for outputs driven low

respectively

RDSON = -V----D----D----I-5-O----–-H---V-----O-----H-- ;for outputs driven high

2. Internal voltage regulator enabled

PINT = IDDR ⋅ VDDR + IDDA ⋅ VDDA

IDDR is the current shown in Table A-7 and not the overall current flowing into VDDR, which

additionally contains the current flowing into the external loads with output high.

∑ PIO = i RDSON ⋅ IIOi2

PIO is the sum of all output currents on I/O ports associated with VDDX and VDDR.

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