STM32F412CE datasheet(79/193 Pages) STMICROELECTRONICS

部件名	STM32F412CE

功能描述	ARM-Cortex-M4 32b MCUFPU, 125 DMIPS, 1MB Flash, 256KB RAM, USB OTG FS, 17 TIMs, 1 ADC, 17 comm. interfaces

PDF	193 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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79 / 193 page

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STM32F412xE/G

Electrical characteristics

161

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 17.

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 18. Operating conditions at power-up / power-down (regulator ON)

Table 17. 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

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

Symbol

Parameter

Min

Max

Unit

tVDD

VDD rise time rate

∞

µs/V

VDD fall time rate

∞

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