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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HCS08 데이터시트(PDF) 286 Page - NXP Semiconductors |
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HCS08 데이터시트(HTML) 286 Page - NXP Semiconductors |
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286 / 316 page  Appendix A Electrical Characteristics MC9S08SG8 MCU Series Data Sheet, Rev. 8 286 Freescale Semiconductor The average chip-junction temperature (TJ) in C can be obtained from: TJ = TA + (PD JA) Eqn. A-1 where: TA = Ambient temperature, C JA = 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. An approximate relationship between PD and TJ (if PI/O is neglected) is: PD = K (TJ + 273C) Eqn. A-2 Solving Equation A-1 and Equation A-2 for K gives: K = PD (TA + 273C) + JA (PD) 2 Eqn. A-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 Equation A-1 and Equation A-2 iteratively for any value of TA. |
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