STM32F401CCU6 datasheet(22/135 Pages) STMICROELECTRONICS

Part #	STM32F401CCU6

Description	ARM Cortex-M4 32b MCUFPU, 105 DMIPS, 256KB Flash/64KB RAM, 11 TIMs, 1 ADC, 11 comm. interfaces

PDF	135 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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22 / 135 page

DocID024738 Rev 6

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STM32F401xB STM32F401xC

Functional overview

Figure 7. Regulator OFF

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 1.7 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 1.7 V (see Figure 8).

•

Otherwise, if the time for VCAP_1 and VCAP_2 to reach V12 minimum value is slower

than the time for VDD to reach 1.7 V, then PA0 could be asserted low externally (see

Figure 9).

•

If VCAP_1 and VCAP_2 go below V12 minimum value and VDD is higher than 1.7 V, then a

reset must be asserted on PA0 pin.

Note:

The minimum value of V12 depends on the maximum frequency targeted in the application

STM32F401CCU6 Datasheet(PDF) 22 Page - STMicroelectronics