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STM8S105C4 Datasheet(PDF) 106 Page - STMicroelectronics |
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STM8S105C4 Datasheet(HTML) 106 Page - STMicroelectronics |
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106 / 121 page  Thermal characteristics STM8S105x4/6 106/121 DocID14771 Rev 15 12 Thermal characteristics The maximum junction temperature (TJmax) of the device must never exceed the values specified in Table 18: General operating conditions, otherwise the functionality of the device cannot be guaranteed. The maximum junction temperature TJmax, in degrees Celsius, may be calculated using the following equation: TJmax = TAmax + (PDmax x JA) Where: TAmax is the maximum ambient temperature in C JA 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 = (VOL*IOL) + ((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. 12.1 Reference document JESD51-2 integrated circuits thermal test method environment conditions - natural convection (still air). Available from www.jedec.org. Table 56. 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 JA Thermal resistance junction-ambient LQFP48 - 7x7 mm °C/W Thermal resistance junction-ambient LQFP44 - 10x10 mm Thermal resistance junction-ambient LQFP32 - 7x7 mm Thermal resistance junction-ambient UFQFPN32 - 5x5 mm Thermal resistance junction-ambient SDIP32 - 400 ml |
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