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STM32H745II Datasheet(PDF) 248 Page - STMicroelectronics |
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STM32H745II Datasheet(HTML) 248 Page - STMicroelectronics |
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248 / 252 page ![]() Package information STM32H745xI/G 248/252 DS12923 Rev 1 7.6 Thermal characteristics The maximum chip-junction temperature, TJ max, in degrees Celsius, may be calculated using the following equation: TJ max = TA max + (PD max × ΘJA) Where: • TA max is the maximum ambient temperature in ° C, •ΘJA is the package junction-to-ambient thermal resistance, in ° C/W, • PD max is the sum of PINT max and PI/O max (PD max = PINT max + PI/Omax), • PINT max is the product of IDD and VDD, expressed in Watts. This is the maximum chip internal power. PI/O max represents the maximum power dissipation on output pins where: PI/O max = 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. Table 136. Thermal characteristics Symbol Definition Parameter Value Unit ΘJA Thermal resistance junction-ambient Thermal resistance junction-ambient LQFP144 - 20 x 20 mm /0.5 mm pitch 43.7 °C/W Thermal resistance junction-ambient LQFP176 - 24 x 24 mm /0.5 mm pitch 43.0 Thermal resistance junction-ambient LQFP208 - 28 x 28 mm /0.5 mm pitch 42.4 Thermal resistance junction-ambient UFBGA176+25 - 10 x 10 mm /0.65 mm pitch 37.4 Thermal resistance junction-ambient TFBGA240+25 - 14 x 14 mm / 0.8 mm pitch 36.6 ΘJC Thermal resistance junction-case Thermal resistance junction-ambient LQFP144 - 20 x 20 mm /0.5 mm pitch 11.3 °C/W Thermal resistance junction-ambient LQFP176 - 24 x 24 mm /0.5 mm pitch 11.2 Thermal resistance junction-ambient LQFP208 - 28 x 28 mm /0.5 mm pitch 11.1 Thermal resistance junction-ambient UFBGA176+25 - 10 x 10 mm /0.65 mm pitch 23.9 Thermal resistance junction-ambient TFBGA240+25 - 14 x 14 mm / 0.8 mm pitch 7.4 |
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