MC9S08MP16VLC Datasheet, PDF(10/36 Page) Freescale Semiconductor, Inc

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MC9S08MP16VLC Datasheet, PDF (10/36 Pages) Freescale Semiconductor, Inc – MC9S08MP16 Series Data Sheet

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Electrical Characteristics

2.4 Thermal Characteristics

This section provides information about operating temperature range, power dissipation, and package thermal resistance. Power

dissipation on I/O pins is usually small compared to the power dissipation in on-chip logic and voltage regulator circuits, and

it is user-determined rather than being controlled by the MCU design. To take PI/O into account in power calculations, determine

the difference between actual pin voltage and VSS or VDD and multiply by the pin current for each I/O pin. Except in cases of

unusually high pin current (heavy loads), the difference between pin voltage and VSS or VDD will be very small.

Table 4. Thermal Characteristics

Num C

Rating

Symbol

Consumer &

Industrial

Automotive

Unit

1 â Operating temperature range (packaged)

D Maximum junction temperature

D Thermal resistance 1,2

single-layer board

48-pin LQFP

32-pin LQFP

ï±JA

28-pin SOIC

D Thermal resistance 1,2

four-layer board

â40 to 105

115

â40 to 125

ï°C

135

ï°C

ï°C/W

48-pin LQFP

32-pin LQFP

28-pin SOIC

ï±JA

ï°C/W

1 Junction temperature is a function of die size, on-chip power dissipation, package thermal resistance, mounting site (board)

temperature, ambient temperature, air flow, power dissipation of other components on the board, and board thermal

resistance.

2 Junction-to-ambient natural convection

The average chip-junction temperature (TJ) in ï°C can be obtained from:

TJ = TA + (PD ï´ ï±JA)

Eqn. 1

where:

TA = Ambient temperature, ï°C

ï±JA = Package thermal resistance, junction-to-ambient, ï°C/W

PD = Pint ï«ï PI/O

Pint = IDD ï´ VDD, Watts â chip internal power

PI/O = Power dissipation on input and output pins â user determined

For most applications, PI/O ï¼ï¼ Pint and can be neglected. An approximate relationship between PD and TJ (if PI/O is neglected)

is:

PD = K ï¸ (TJ + 273ï°C)

Solving Equation 1 and Equation 2 for K gives:

Eqn. 2

K = PD ï´ (TA + 273ï°C) + ï±JA ï´ (PD)2

Eqn. 3

MC9S08MP16 Series Data Sheet, Rev. 2

Freescale Semiconductor

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