STM32WB50CG datasheet(77/119 Pages) STMICROELECTRONICS

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DS13047 Rev 5

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STM32WB50CG STM32WB30CE

Electrical characteristics

110

6.3.10

External clock source characteristics

High-speed external user clock generated from an external source

The high-speed external (HSE) clock is supplied with a 32 MHz crystal oscillator or a sine or

a square wave.

The STM32WB50CG and STM32WB30CE include internal programmable capacitances

that can be used to tune the crystal frequency to compensate the PCB parasitic one.

The characteristics in Table 48 and Table 50 are measured over recommended operating

conditions, unless otherwise specified. Typical values are referred to TA = 25 °C and 

VDD = 3.0 V.

Table 47. Wakeup time using USART(1)

Symbol

Parameter

Conditions

Typ

Max

Unit

tWUUSART

Wakeup time needed to calculate the maximum

USART baud rate allowing to wakeup up from Stop

mode when USART clock source is HSI16

Stop mode 0

1.7

µs

Stop mode 1/2

8.5

1. Guaranteed by design.

Table 48. HSE crystal requirements(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fNOM

Oscillator frequency

MHz

fTOL

Frequency tolerance

Includes initial accuracy, stability over

temperature, aging and frequency pulling

due to incorrect load capacitance.

(2)

ppm

Load capacitance

ESR

Equivalent series resistance

100

Ω

1. 32 MHz XTAL is specified for two specific references: NX2016SA and NX1612SA.

2. Refer to the standard specification: 50 ppm for BLE, 40 ppm for 802.15.4.

Table 49. HSE clock source characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSE_ext

Oscillator frequency

MHz

fTOLHSE

Frequency tolerance

Includes initial accuracy, stability

over temperature and aging

(2)

ppm

VHSE

Clock input voltage limits

Sine or square wave, AC-coupled(3)

0.4

1.6

VPP

DuCy(HSE) Duty cycle

tr, tf

Rise and fall times

10% - 90% square wave

15 * VPP

φn(HSE)

Phase noise for 32 MHz

Offset = 10 kHz

-127

dBc/Hz

Offset = 100 kHz

-135

Offset = 1 MHz

-138

1. Guaranteed by design.

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