STM32WBA50KG datasheet(77/110 Pages) STMICROELECTRONICS

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DS14688 Rev 1

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STM32WBA50KG

Electrical characteristics

103

Note:

For information about oscillator trimming, refer to AN5042 “Precise HSE frequency and

startup time tuning for STM32 wireless MCUs”, available on www.st.com.

Low-speed external clock

The low-speed external (LSE) clock can be supplied with a crystal or a clock source. The

information provided in this section is based on design simulation results, obtained with the

typical external components specified in Table 49. In the application, the crystal and the load

capacitors must be placed as close as possible to the oscillator pins, to minimize output

distortion and startup stabilization time. Refer to the crystal resonator manufacturer for more

details on the resonator characteristics (frequency, package, accuracy).

Table 49. LSE oscillator characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max Unit

fLSE

Oscillator frequency(2)

32.000

32.768

-kHz

fTOL

Frequency tolerance

Includes initial accuracy, stability

over temperature, aging and

frequency pulling due to incorrect

load capacitance

Bluetooth

Low Energy

-500

500

ppm

IDD(LSE)

LSE current

consumption

LSEDRV = medium-low drive capability

450

LSEDRV = medium-high drive capability

590

LSEDRV = high drive capability

700

Gmcritmax

Maximum critical

crystal Gm

LSEDRV = medium-low drive capability

0.75

µA/V

LSEDRV = medium-high drive capability

1.70

LSEDRV = high drive capability

2.70

CS_PARA

Internal stray parasitic

capacitance(3)

tSU(LSE) Startup time(4)

VDD is stabilized

1. Specified by design, not tested in production.

2. For information on selecting the crystal, refer to AN2867 ‘Oscillator design guide for STM8AF/AL/S, STM32 MCUs and

MPUs”.

3. CS_PARA is the equivalent capacitance seen by the crystal due to OSC32_IN and OSC32_OUT internal parasitic

capacitances.

4. Time measured from when the LSE is enabled by software, until a stable LSE oscillation is reached. This value is

measured for a standard crystal, and can vary significantly with the crystal used.

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