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STM32F103RBT6XXX Datasheet(PDF) 83 Page - STMicroelectronics |
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STM32F103RBT6XXX Datasheet(HTML) 83 Page - STMicroelectronics |
83 / 92 page STM32F103x8, STM32F103xB Package characteristics Doc ID 13587 Rev 11 83/92 6.2.2 Selecting the product temperature range When ordering the microcontroller, the temperature range is specified in the ordering information scheme shown in Table 57: Ordering information scheme. Each temperature range suffix corresponds to a specific guaranteed ambient temperature at maximum dissipation and, to a specific maximum junction temperature. As applications do not commonly use the STM32F103xx at maximum dissipation, it is useful to calculate the exact power consumption and junction temperature to determine which temperature range will be best suited to the application. The following examples show how to calculate the temperature range needed for a given application. Example 1: 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 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 56 TJmax is calculated as follows: – For LQFP100, 46 °C/W TJmax = 82 °C + (46 °C/W × 447 mW) = 82 °C + 20.6 °C = 102.6 °C This is within the range of the suffix 6 version parts (–40 < TJ < 105 °C). In this case, parts must be ordered at least with the temperature range suffix 6 (see Table 57: Ordering information scheme). Example 2: High-temperature application Using the same rules, it is possible to address applications that run at high ambient temperatures with a low dissipation, as long as junction temperature TJ remains within the specified range. Assuming the following application conditions: Maximum ambient temperature TAmax = 115 °C (measured according to JESD51-2), IDDmax = 20 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 PINTmax = 20 mA × 3.5 V= 70 mW PIOmax = 20 × 8 mA × 0.4 V = 64 mW This gives: PINTmax = 70 mW and PIOmax = 64 mW: PDmax = 70 + 64 = 134 mW Thus: PDmax = 134 mW |
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