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MC9S08QE32 bảng dữ liệu(PDF) 11 Page - Freescale Semiconductor, Inc |
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MC9S08QE32 bảng dữ liệu(HTML) 11 Page - Freescale Semiconductor, Inc |
11 / 46 page Electrical Characteristics MC9S08QE32 Series MCU Data Sheet, Rev. 6 Freescale Semiconductor 11 The average chip-junction temperature (TJ) in °C can be obtained from: TJ = TA + (PD × θJA) Eqn. 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. An approximate relationship between PD and TJ (if PI/O is neglected) is: PD = K ÷ (TJ + 273°C) Eqn. 2 Solving Equation 1 and Equation 2 for K gives: K = PD × (TA + 273°C) + θJA × (PD) 2 Eqn. 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 1 and Equation 2 iteratively for any value of TA. Table 4. Thermal Characteristics Rating Symbol Value Unit Operating temperature range (packaged) TA TL to TH –40 to 85 °C Maximum junction temperature TJM 95 °C Thermal resistance Single-layer board 48-pin QFN θ JA 81 °C/W 44-pin LQFP 68 32-pin LQFP 66 28-pin SOIC 57 Thermal resistance Four-layer board 48-pin QFN θ JA 26 °C/W 44-pin LQFP 46 32-pin LQFP 54 28-pin SOIC 42 |
Số phần tương tự - MC9S08QE32_09 |
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Mô tả tương tự - MC9S08QE32_09 |
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