STM32WB55CC datasheet(108/165 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32WB55xx

108/165

DS11929 Rev 3

Note:

For information about the trimming of the oscillator, refer to application note AN5042 “HSE

trimming for RF applications using the STM32WB Series”.

Low-speed external user clock generated from an external source

The low-speed external (LSE) clock can be supplied with a 32.768 kHz crystal resonator

oscillator. The information provided in this section is based on design simulation results

obtained with typical external components specified in Table 54. In the application, the

resonator and the load capacitors have to 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).

Note:

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

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

Table 54. Low-speed external user clock characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

IDD(LSE)

LSE current consumption

LSEDRV[1:0] = 00

Low drive capability

-250

LSEDRV[1:0] = 01

Medium low drive capability

-315

LSEDRV[1:0] = 10

Medium high drive capability

-500

LSEDRV[1:0] = 11

High drive capability

-630

Gmcritmax Maximum critical crystal gm

LSEDRV[1:0] = 00

Low drive capability

0.50

µA/V

LSEDRV[1:0] = 01

Medium low drive capability

0.75

LSEDRV[1:0] = 10

Medium high drive capability

1.70

LSEDRV[1:0] = 11

High drive capability

2.70

tSU(LSE)(2) Startup time

VDD stabilized

1. Guaranteed by design.

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

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

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