STM32WB35RGQ7TR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STM32WB35RGQ7TR

Multiprotocol wireless 32-bit MCU Arm®-based Cortex®-M4 with FPU, Bluetooth® 5 and 802.15.4 radio solution

STMicroelectronics 

STM32WB55xx STM32WB35xx

Electrical characteristics

1. Guaranteed by design.

2.

trSeUa(cLhSeEd) .isTthhies

startup time measured from the moment

value is measured for a standard crystal

it is

and

enabled (by software) until a stable 32

it can vary significantly with the crystal

kHz oscillation

manufacturer.

is

Note:

For information on selecting the crystal refer to application note AN2867 “Oscillator design

guide for STM8S, STM8A and STM32 microcontrollers” available from www.st.com.

Figure 22. Typical application with a 32.768 kHz crystal

Resonator with integrated

capacitors

CL1

OSC32_IN

fLSE

32.768 kHz

resonator

Drive

programmable

amplifier

OSC32_OUT

CL2

Note:

MS30253V2

No external resistors are required between OSC32_IN and OSC32_OUT, and it is forbidden

to add one.

In bypass mode the LSE oscillator is switched off and the input pin is a standard GPIO.

The external clock signal has to respect the I/O characteristics detailed in Section 6.3.17.

The recommend clock input waveform is shown in Figure 23.

Figure 23. Low-speed external clock source AC timing diagram

tw(LSEH)

VLSEH

90%

10%

VLSEL

tr(LSE)

tf(LSE)

tw(LSEL)

t

TLSE

MS19215V2

Table 58. Low-speed external user clock characteristics(1) – Bypass mode

Symbol

Parameter

Conditions

Min

Typ

Max Unit

fLSE_ext

User external clock

source frequency

-

21.2

32.768

44.4

kHz

DS11929 Rev 10

121/193

169

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