MC68HC05L28 查看數據表（PDF） - Freescale Semiconductor

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MC68HC05L28

Microcontrollers

Freescale Semiconductor 

Freescale Semiconductor, Inc.

12.2

Thermal characteristics and power considerations

Table 12-2

The average chip junction temperature, TJ, in degrees Celcius can be obtained from the following

equation:

[1]

where:

TA = Ambient Temperature (C)

θJA = Package Thermal Resistance, Junction-to-ambient (C/W)

PD = PINT + PI/O (W)

PINT = Internal Chip Power = IDD • VDD (W)

PI/O = Power Dissipation on Input and Output pins (User determined)

An approximate relationship between PD and TJ (if PI/O is neglected) is:

[2]

Solving equations [1] and [2] for K gives:

[3]

where K is a constant for a particular part. K can be determined by measuring PD (at equilibrium)

for a known TA. Using this value of K, the values of PD and TJ can be obtained for any value of TA

by solving the above equations. The package thermal characteristics are shown in Table 12-2.

12

MOTOROLA

12-2

ELECTRICAL SPECIFICATIONS

MC68HC05L28

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