STM32WB55 datasheet(138/193 Pages) STMICROELECTRONICS

Part #	STM32WB55

Description	Multiprotocol wireless 32-bit MCU Arm®-based Cortex®-M4 with FPU, Bluetooth® 5.2 and 802.15.4 radio solution

PDF	193 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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138 / 193 page

Electrical characteristics

STM32WB55xx STM32WB35xx

138/193

DS11929 Rev 11

Figure 28. 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 75, otherwise the reset will not be taken into account by the device.

3. The external capacitor on NRST must be placed as close as possible to the device.

Table 75. NRST pin characteristics(1)

Guaranteed by design.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL(NRST)

NRST input



low level voltage

0.3 x VDD

VIH(NRST)

NRST input



high level voltage

0.7 x VDD

Vhys(NRST)

NRST Schmitt trigger

voltage hysteresis

200

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%)

VIN = VSS

kΩ

VF(NRST)

NRST input



filtered pulse

VNF(NRST)

NRST input



not filtered pulse

1.71 V ≤ VDD ≤ 3.6 V

350

MS19878V3

RPU

VDD

Internal reset

External

reset circuit

(1)

NRST

(2)

Filter

0.1 μF

STM32WB55 Datasheet(PDF) 138 Page - STMicroelectronics

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