STM32WB55 datasheet(121/193 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

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

121 / 193 page

DS11929 Rev 11

121/193

STM32WB55xx STM32WB35xx

Electrical characteristics

169

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

Note:

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

1. Guaranteed by design.

2. tSU(LSE) is the startup time measured from the moment it is enabled (by software) until a stable 32 kHz oscillation is

reached. This value is measured for a standard crystal and it can vary significantly with the crystal manufacturer.

MS30253V2

OSC32_IN

OSC32_OUT

Drive

programmable

amplifier

fLSE

32.768 kHz

resonator

Resonator with integrated

capacitors

CL1

CL2

MS19215V2

VLSEH

tf(LSE)

90%

10%

TLSE

tr(LSE)

VLSEL

tw(LSEH)

tw(LSEL)

STM32WB55 Datasheet(PDF) 121 Page - STMicroelectronics

STM32WB55 Datasheet(HTML) 121 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL