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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32H757II датащи(PDF) 26 Page - STMicroelectronics |
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STM32H757II датащи(HTML) 26 Page - STMicroelectronics |
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26 / 251 page  Functional overview STM32H757xI 26/251 DS12931 Rev 1 Figure 4. Power-up/power-down sequence 1. VDDx refers to any power supply among VDDA, VDD33USB, VDD50USB and VDDDSI. 2. VDD and VDDSMPS must be wired together into order to follow the same voltage sequence. 3.5.2 Power supply supervisor The devices have an integrated power-on reset (POR)/ power-down reset (PDR) circuitry coupled with a Brownout reset (BOR) circuitry: • Power-on reset (POR) The POR supervisor monitors VDD power supply and compares it to a fixed threshold. The devices remain in Reset mode when VDD is below this threshold, • Power-down reset (PDR) The PDR supervisor monitors VDD power supply. A reset is generated when VDD drops below a fixed threshold. The PDR supervisor can be enabled/disabled through PDR_ON pin. • Brownout reset (BOR) The BOR supervisor monitors VDD power supply. Three BOR thresholds (from 2.1 to 2.7 V) can be configured through option bytes. A reset is generated when VDD drops below this threshold. MSv47490V1 0.3 1 VBOR0 3.6 Operating mode Power-on Power-down time V VDDX (1) VDD Invalid supply area VDDX < VDD + 300 mV VDDX independent from VDD |
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