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STM8AF528ATAY 数据表(PDF) 89 Page - STMicroelectronics |
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STM8AF528ATAY 数据表(HTML) 89 Page - STMicroelectronics |
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89 / 114 page ![]() DocID14395 Rev 10 89/114 STM8AF52/62xx, STM8AF51/61xx Electrical characteristics 113 10.4 Thermal characteristics In case the maximum chip junction temperature (TJmax) specified in Table 26: General operating conditions is exceeded, the functionality of the device cannot be guaranteed. TJmax, in degrees Celsius, may be calculated using the following equation: Equation 3 TJmax = TAmax + (PDmax x ΘJA) where: TAmax is the maximum ambient temperature in °C ΘJA is the package junction-to-ambient thermal resistance in ° C/W PDmax is the sum of PINTmax and PI/Omax (PDmax = PINTmax + PI/Omax) PINTmax is the product of IDD and VDD, expressed in Watts. This is the maximum chip internal power. PI/Omax represents the maximum power dissipation on output pins where: Equation 4 PI/Omax = Σ (VOL * IOL) + Σ((VDD - VOH) * IOH) taking into account the actual VOL / IOL and VOH / IOH of the I/Os at low- and high-level in the application. 10.4.1 Reference document JESD51-2 integrated circuits thermal test method environment conditions - natural convection (still air). Available from www.jedec.org. Table 51. Thermal characteristics(1) 1. Thermal resistances are based on JEDEC JESD51-2 with 4-layer PCB in a natural convection environment. Symbol Parameter Value Unit ΘJA Thermal resistance junction-ambient LQFP 80 - 14 x 14 mm 38 °C/W ΘJA Thermal resistance junction-ambient LQFP 64 - 10 x 10 mm 46 °C/W ΘJA Thermal resistance junction-ambient LQFP 48 - 7 x 7 mm 57 °C/W ΘJA Thermal resistance junction-ambient LQFP 32 - 7 x 7 mm 59 °C/W ΘJA Thermal resistance junction-ambient VFQFPN 32 - 5 x 5 mm 25 °C/W |
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