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STM8AF/P63AA 数据表(PDF) 110 Page - STMicroelectronics |
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STM8AF/P63AA 数据表(HTML) 110 Page - STMicroelectronics |
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110 / 116 page  Package information STM8AF6388 110/116 DocID031156 Rev 1 11.6.2 Selecting the product temperature range When ordering the microcontroller, the temperature range is specified in the order code (see Figure 60: STM8AF6388 ordering information scheme1 on page 111). The following example shows how to calculate the temperature range needed for a given application. Assuming the following application conditions: – Maximum ambient temperature TAmax = 82 °C (measured according to JESD51-2) –IDDmax = 8 mA –VDD = 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 = 8 mA x 5 V = 400 mW PIOmax = 20 x 8 mA x 0.4 V = 64 mW This gives: PINTmax = 400 mW and PIOmax 64 mW PDmax = 400 mW + 64 mW Thus: PDmax = 464 mW. Using the values obtained in Table 52: Thermal characteristics TJmax is calculated as follows: For LQFP64 46 °C/W Tjmax = 82 °C + (46 °C/W x 464 mW) = 82 °C + 21 °C = 103 ° C This is within the range of the suffix C version parts (-40 °C < Tj < 125 ° C). Parts must be ordered at least with the temperature range suffix C. |
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