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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32F446RC датащи(PDF) 79 Page - STMicroelectronics |
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STM32F446RC датащи(HTML) 79 Page - STMicroelectronics |
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79 / 201 page  DocID027107 Rev 5 79/201 STM32F446xC/E Electrical characteristics 174 Figure 20. External capacitor CEXT 1. Legend: ESR is the equivalent series resistance. 6.3.3 Operating conditions at power-up / power-down (regulator ON) Subject to general operating conditions for TA. 6.3.4 Operating conditions at power-up / power-down (regulator OFF) Subject to general operating conditions for TA. Table 18. VCAP_1/VCAP_2 operating conditions(1) 1. When bypassing the voltage regulator, the two 2.2 µF VCAP capacitors are not required and should be replaced by two 100 nF decoupling capacitors. Symbol Parameter Conditions CEXT Capacitance of external capacitor 2.2 µF ESR ESR of external capacitor < 2 Ω CEXT Capacitance of external capacitor with a single VCAP pin available 4.7 µF ESR ESR of external capacitor with a single VCAP pin available < 1 Ω Table 19. Operating conditions at power-up/power-down (regulator ON) Symbol Parameter Min Max tVDD VDD rise time rate 20 ∞ VDD fall time rate 20 ∞ Table 20. Operating conditions at power-up / power-down (regulator OFF)(1) 1. To reset the internal logic at power-down, a reset must be applied on pin PA0 when VDD reach below 1.08 V. Symbol Parameter Conditions Min Max Unit tVDD VDD rise time rate Power-up 20 ∞ µs/V VDD fall time rate Power-down 20 ∞ tVCAP VCAP_1 and VCAP_2 rise time rate Power-up 20 ∞ VCAP_1 and VCAP_2 fall time rate Power-down 20 ∞ |
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