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STM8L151F3 数据表(PDF) 118 Page - STMicroelectronics |
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STM8L151F3 数据表(HTML) 118 Page - STMicroelectronics |
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118 / 122 page ![]() Package information STM8L151x2, STM8L151x3 118/122 DocID018780 Rev 9 10.7 Thermal characteristics The maximum chip junction temperature (TJmax) must never exceed the values given in Table 17: General operating conditions on page 57. The maximum chip-junction temperature, TJmax, in degree Celsius, may be calculated using the following equation: 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: PI/Omax = Σ (VOL*IOL) + Σ((VDD-VOH)*I OH), taking into account the actual VOL/IOL and VOH/IOH of the I/Os at low and high level in the application. Table 62. 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 48- 7 x 7 mm 65 °C/W ΘJA Thermal resistance junction-ambient UFQFPN 32 - 5 x 5 mm 38 °C/W ΘJA Thermal resistance junction-ambient UFQFPN28 - 4 x 4 mm 80 °C/W ΘJA Thermal resistance junction-ambient UFQFPN20 - 3 x 3 mm 102 °C/W ΘJA Thermal resistance junction-ambient TSSOP20 110 °C/W |
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