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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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STM8AP5X2ATAY 数据表(PDF) 89 Page - STMicroelectronics |
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STM8AP5X2ATAY 数据表(HTML) 89 Page - STMicroelectronics |
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89 / 100 page  STM8AF61xx, STM8AF51xx Electrical characteristics 89/100 11.4.2 Selecting the product temperature range When ordering the microcontroller, the temperature range is specified in the order code (see Figure 47: STM8A order codes on page 95 ). 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 42: Thermal characteristics on page 88 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 B version parts (-40 < TJ < 105° C). Parts must be ordered at least with the temperature range suffix B. |
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