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STR750FV0 Scheda tecnica(PDF) 80 Page - STMicroelectronics |
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STR750FV0 Scheda tecnica(HTML) 80 Page - STMicroelectronics |
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80 / 84 page ![]() Package characteristics STR750Fxx STR751Fxx STR752Fxx STR755Fxx 80/84 6.2.2 Selecting the product temperature range When ordering the microcontroller, the temperature range is specified in the order code Table 49: Order codes on page 81. 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 0.4V = 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 48 TJmax is calculated as follows: – For LQFP100, 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 6 version parts (-40 < TJ < 105° C). In this case, parts must be ordered at least with the temperature range suffix 6 (see Table 49: Order codes on page 81). – For BGA64, 58°C/W TJmax = 82° C + (58° C/W x 464 mW) = 82°C + 27°C = 109° C This is within the range of the suffix 7 version parts (-40 < TJ < 125° C). In this case, parts must be ordered at least with the temperature range suffix 7 (see Table 49: Order codes on page 81). Figure 50. LQFP100 PDmax vs TA 0 100 200 300 400 500 600 700 TA (° C) Suffix 6 Suffix 7 |
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