STM32F383CC datasheet(87/125 Pages) STMICROELECTRONICS

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STM32F383xx

Electrical characteristics

109

Figure 20. 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 52. Otherwise the reset will not be taken into account by the device.

NPOR pin characteristics

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

resistor to the VDDA, RPU (see Table 49).

Unless otherwise specified, the parameters given in Table 53 are derived from tests

performed under ambient temperature and VDDA supply voltage conditions summarized in

Table 22.

Table 53. NPOR pin characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL(NPOR)(1)

1. Guaranteed by design, not tested in production.

NPOR Input low level voltage

0.475VDDA

- 0.2

VIH(NPOR)(1) NPOR Input high level voltage

0.5VDDA

+ 0.2

Vhys(NPOR)(1)

NPOR Schmitt trigger voltage

hysteresis

-100

RPU

Weak pull-up equivalent resistor(2)

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

the series resistance is minimal (~10% order).

VIN = VSS

MS19878V1

RPU

NRST(2)

VDD

Filter

Internal Reset

0.1 μF

External

reset circuit(1)

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