STM32WB55 datasheet(120/193 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32WB55xx STM32WB35xx

120/193

DS11929 Rev 11

Note:

For information about oscillator trimming refer to AN5165 “Development of RF hardware

using STM32WB microcontrollers”, available from www.st.com.

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 57. 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).

Table 56. HSE oscillator characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

tSUA(HSE)

Startup time



for 80% amplitude stabilization VDDRF stabilized, 

XOTUNE=000000,



-40 to +125 °C range

-1000-

µs

tSUR(HSE)

Startup time



for XOREADY signal

250

IDDRF(HSE) HSE current consumption

HSEGMC=000, XOTUNE=000000

µA

XOTg(HSE) XOTUNE granularity

Capacitor bank

-1

ppm

XOTfp(HSE) XOTUNE frequency pulling

±20

±40

XOTnb(HSE) XOTUNE number of tuning bits

bit

XOTst(HSE) XOTUNE setting time

0.1

Table 57. 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

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