STM32F411CC datasheet(103/149 Pages) STMICROELECTRONICS

部件名	STM32F411CC

功能描述	ARM® Cortex®-M4 32b MCUFPU, 125 DMIPS, 512KB Flash, 128KB RAM, USB OTG FS, 11 TIMs, 1 ADC, 13 comm. interfaces

PDF	149 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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103 / 149 page

DocID026289 Rev 6

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STM32F411xC STM32F411xE

Electrical characteristics

123

6.3.17

NRST pin characteristics

The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up

resistor, RPU (see Table 53).

Unless otherwise specified, the parameters given in Table 56 are derived from tests

performed under the ambient temperature and VDD supply voltage conditions summarized

in Table 14. Refer to Table 53: I/O static characteristics for the values of VIH and VIL for

NRST pin.

Figure 32. Recommended NRST pin protection

1. The reset network protects the device against parasitic resets.

2. The user must ensure that the level on the NRST pin can go below the VIL(NRST) max level specified in

Table 56. Otherwise the reset is not taken into account by the device.

Table 56. NRST pin characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

RPU

Weak pull-up equivalent

resistor(1)

VIN = VSS

VF(NRST)(2) NRST Input filtered pulse

100

VNF(NRST)(2) NRST Input not filtered pulse

VDD > 2.7 V

300

TNRST_OUT Generated reset pulse duration

Internal Reset

source

µs

1. The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution to the series

resistance must be minimum (~10% order)

2. Guaranteed by design.

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