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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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STM32F412XE Fiches technique(PDF) 29 Page - STMicroelectronics |
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STM32F412XE Fiches technique(HTML) 29 Page - STMicroelectronics |
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29 / 201 page  DocID028087 Rev 7 29/201 STM32F412xE/G Functional overview 42 Figure 8. 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 9). • 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 10). • 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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