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STM32F412XE bảng dữ liệu(PDF) 85 Page - STMicroelectronics

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STM32F412XE bảng dữ liệu(HTML) 85 Page - STMicroelectronics

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STM32F412xE/G
Electrical characteristics
166
6.3.2
VCAP_1/VCAP_2 external capacitors
Stabilization for the main regulator is achieved by connecting the external capacitor CEXT to
the VCAP_1 and VCAP_2 pins. For packages supporting only 1 VCAP pin, the 2 CEXT
capacitors are replaced by a single capacitor.
CEXT is specified in Table 18.
Figure 23. 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.
Table 19. Operating conditions at power-up / power-down (regulator ON)
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 with the pins
VCAP_1 and VCAP_2 available
2.2 µF
ESR
ESR of external capacitor with the pins VCAP_1 and
VCAP_2 available
< 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
Symbol
Parameter
Min
Max
Unit
tVDD
VDD rise time rate
20
∞
µs/V
VDD fall time rate
20
∞



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