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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32F401CD датащи(PDF) 23 Page - STMicroelectronics |
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STM32F401CD датащи(HTML) 23 Page - STMicroelectronics |
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23 / 135 page  DocID025644 Rev 3 23/135 STM32F401xD STM32F401xE Functional overview 54 Figure 7. Regulator OFF The following conditions must be respected: • VDD should always be higher than VCAP_1 and VCAP_2 to avoid current injection between power domains. • If the time for VCAP_1 and VCAP_2 to reach V12 minimum value is faster than the time for VDD to reach 1.7 V, then PA0 should be kept low to cover both conditions: until VCAP_1 and VCAP_2 reach V12 minimum value and until VDD reaches 1.7 V (see Figure 8). • Otherwise, if the time for VCAP_1 and VCAP_2 to reach V12 minimum value is slower than the time for VDD to reach 1.7 V, then PA0 could be asserted low externally (see Figure 9). • If VCAP_1 and VCAP_2 go below V12 minimum value and VDD is higher than 1.7 V, then a reset must be asserted on PA0 pin. Note: The minimum value of V12 depends on the maximum frequency targeted in the application |
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