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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32F102XB датащи(PDF) 75 Page - STMicroelectronics |
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STM32F102XB датащи(HTML) 75 Page - STMicroelectronics |
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75 / 80 page  DocID15056 Rev 5 75/80 STM32F102x8, STM32F102xB Package characteristics 79 6.3.1 Evaluating the maximum junction temperature for an application When ordering the microcontroller, the temperature range is specified in the ordering information scheme shown in Table 55: Ordering information scheme. Each temperature range suffix corresponds to a specific guaranteed ambient temperature at maximum dissipation and, to a specific maximum junction temperature. Here, only temperature range 6 is available (–40 to 85 °C). The following example shows how to calculate the temperature range needed for a given application, making it possible to check whether the required temperature range is compatible with the STM32F102xx junction temperature range. Example: High-performance application Assuming the following application conditions: Maximum ambient temperature TAmax = 82 °C (measured according to JESD51-2), IDDmax = 50 mA, VDD = 3.5 V, maximum 20 I/Os used at the same time in output at low level with IOL = 8 mA, VOL= 0.4 V and maximum 8 I/Os used at the same time in output mode at low level with IOL = 20 mA, VOL= 1.3 V PINTmax = 50 mA × 3.5 V= 175 mW PIOmax = 20 × 8 mA × 0.4 V + 8 × 20 mA × 1.3 V = 272 mW This gives: PINTmax = 175 mW and PIOmax = 272 mW PDmax = 175 + 272 = 447 mW Thus: PDmax = 447 mW Using the values obtained in Table 54 TJmax is calculated as follows: – For LQFP64, 45 °C/W TJmax = 82 °C + (45 °C/W × 447 mW) = 82 °C + 20.1 °C = 102.1 °C This is within the junction temperature range of the STM32F102xx (–40 < TJ < 105 °C). Figure 38. LQFP64 PD max vs. TA 0 100 200 300 400 500 600 700 65 75 85 95 105 115 TA (°C) Suffix 6 |
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