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M68HC08 Datasheet(PDF) 89 Page - Freescale Semiconductor, Inc |
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M68HC08 Datasheet(HTML) 89 Page - Freescale Semiconductor, Inc |
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89 / 124 page  Power Considerations MC68HC05C9A Advance Information Data Sheet, Rev. 5.1 Freescale Semiconductor 89 12.4 Power Considerations The average chip-junction temperature, TJ, in °C, can be obtained from: TJ = TA + (PD × θJA) (1) where: TA = Ambient temperature, °C θJA = Package thermal resistance, junction to ambient, °C/W PD = PINT + PI/O PINT = IDD × VDD watts (chip internal power) PI/O = Power dissipation on input and output pins (user determined) For most applications, PI/O « PINT and can be neglected. The following is an approximate relationship between PD and TJ (neglecting PJ): PD = K ÷ (TJ + 273°C) (2) Solving equations (1) and (2) for K gives: K = PD × (TA + 273°C) + θJA × (PD) 2 (3) where K is a constant pertaining to the particular part. K can be determined from equation (3) by measuring PD (at equilibrium) for a known TA. Using this value of K, the values of PD and TJ can be obtained by solving equations (1) and (2) iteratively for any value of TA. |
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