MAC7200 datasheet(942/976 Pages) FREESCALE

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Power Dissipation and Thermal Characteristics

MAC7200 Microcontroller Family Reference Manual, Rev. 2

864

Freescale Semiconductor

The total power dissipation is calculated from:

Eqn. A-2

Two cases must be considered for PINT:

1. Internal Voltage Regulator enabled:

Eqn. A-3

2. Internal voltage regulator disabled (VDDR = VSSR = system ground):

Eqn. A-4

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

Eqn. A-5

where

Eqn. A-6

Eqn. A-7

IDDR is the current shown in Table A-11 and not the overall current flowing into VDDR, which

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

A.5.1

Thermal Resistance Simulation Details

Table A-8. Thermal Resistance for 100 lead 14x14 mm LQFP, 0.5 mm Pitch1

Rating

Value

Unit

Junction to Ambient (Natural Convection)2, 3

Single layer board (1s)

θJA

°C/W

Junction to Ambient (Natural Convection)2, 4

Four layer board (2s2p)

θJMA

°C/W

Junction to Ambient (@ 200 ft./min.)2, 4

Single layer board (1s)

θJMA

°C/W

Junction to Ambient (@ 200 ft./min.)2, 4

Four layer board (2s2p)

θJMA

°C/W

Junction to Board5

θJB

°C/W

Junction to Case6

θJC

°C/W

Junction to Package Top7

Natural Convection

ΨJT

2°C/W

Junction Temperature (

°C)

Ambient Temperature (

°C)

Total Chip Power Dissipation (W)

Package Thermal Resistance (

°C/W)

INT

Chip Internal Power Dissipation (W)

Input / Output Power Dissipation (W)

INT

DDRVDDR

()

DDAVDDA

()

INT

DD1.5

()

DD3.3

()

DDPLL

()

DDAVDDA

()

DSON

∑

()2

⋅

DSON

---------- (for outputs driven low)

DSON

DDXVOH

–

-------------------------------- (for outputs driven high)

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