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STM32F101X4 Datasheet(PDF) 70 Page - STMicroelectronics |
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STM32F101X4 Datasheet(HTML) 70 Page - STMicroelectronics |
70 / 73 page Package characteristics STM32F101x4, STM32F101x6 70/74 Doc ID 15058 Rev 3 6.2.2 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 50: 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 STM32F101xx 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 49 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 STM32F101xx (–40 < TJ < 105 °C). Figure 36. 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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