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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STR710FZ1T6 датащи(PDF) 69 Page - STMicroelectronics |
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STR710FZ1T6 датащи(HTML) 69 Page - STMicroelectronics |
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69 / 74 page  STR71xF Package characteristics 69/74 3.2 Thermal characteristics The average chip-junction temperature, TJ, in degrees Celsius, may be calculated using the following equation: TJ = TA + (PD x ΘJA) (1) Where: ● TA is the Ambient Temperature in °C, ● ΘJA is the Package Junction-to-Ambient Thermal Resistance, in °C/W, ● PD is the sum of PINT and PI/O (PD = PINT + PI/O), ● PINT is the product of IDD and VDD, expressed in Watts. This is the Chip Internal Power. PI/O represents the Power Dissipation on Input and Output Pins; Most of the time for the application PI/O< PINT and can be neglected. On the other hand, PI/O may be significant if the device is configured to drive continuously external modules and/or memories. An approximate relationship between PD and TJ (if PI/O is neglected) is given by: PD = K / (TJ + 273°C) (2) Therefore (solving equations 1 and 2): K = PD x (TA + 273°C) + ΘJA x PD 2 (3) where: K is a constant for the particular part, which may 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 may be obtained by solving equations (1) and (2) iteratively for any value of TA. Table 38. Thermal characteristics Symbol Parameter Value Unit ΘJA Thermal Resistance Junction-Ambient LQFP 144 - 20 x 20 mm / 0.5 mm pitch 42 °C/W ΘJA Thermal Resistance Junction-Ambient LQFP 64 - 10 x 10 mm / 0.5 mm pitch 45 °C/W ΘJA Thermal Resistance Junction-Ambient LFBGA 64 - 8 x 8 x 1.7mm 58 °C/W ΘJA Thermal Resistance Junction-Ambient LFBGA 144 - 10 x 10 x 1.7mm 50 °C/W |
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