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STM32F405VGT6 Datasheet(PDF) 27 Page - STMicroelectronics |
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STM32F405VGT6 Datasheet(HTML) 27 Page - STMicroelectronics |
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27 / 185 page  DocID022152 Rev 4 27/185 STM32F405xx, STM32F407xx Description 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 1.8 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 1.8 V (see Figure 10). • Otherwise, if the time for VCAP_1 and VCAP_2 to reach V12 minimum value is slower than the time for VDD to reach 1.8 V, then PA0 could be asserted low externally (see Figure 11). • If VCAP_1 and VCAP_2 go below V12 minimum value and VDD is higher than 1.8 V, then a reset must be asserted on PA0 pin. Note: The minimum value of V 12 depends on the maximum frequency targeted in the application (see Table 14: General operating conditions). Figure 10. Startup in regulator OFF mode: slow VDD slope - power-down reset risen after VCAP_1/VCAP_2 stabilization 1. This figure is valid both whatever the internal reset mode (onON or OFFoff). 2. PDR = 1.7 V for reduced temperature range; PDR = 1.8 V for all temperature ranges. ai18491e VDD time Min V12 PDR = 1.7 V or 1.8 V (2) VCAP_1/VCAP_2 V12 NRST time |
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