STM32WB55CC datasheet(107/165 Pages) STMICROELECTRONICS

107 / 165 page

DS11929 Rev 3

107/165

STM32WB55xx

Electrical characteristics

152

6.3.10

External clock source characteristics

High-speed external user clock generated from an external source

The high-speed external (HSE) clock must be supplied with a 32 MHz crystal oscillator.

The STM32WB55xx include internal programmable capacitances that can be used to tune

the crystal frequency in order to compensate the PCB parasitic one.

The characteristics in Table 52 and Table 53 are measured over recommended operating

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

VDD = 3.0 V.

Table 51. Wakeup time using LPUART(1)

Symbol

Parameter

Conditions

Typ

Max

Unit

tWULPUART

Wakeup time needed to calculate the maximum

LPUART baud rate allowing to wakeup up from Stop

mode when LPUART clock source is HSI16

Stop mode 0

1.7

µs

Stop mode 1/2

8.5

1. Guaranteed by design.

Table 52. 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.

ppm

Load capacitance

ESR

Equivalent series resistance

100

Ω

Drive level

100

µW

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

Table 53. 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

VDDRF stabilized, XOTUNE=000000,

-40 to +125 °C range

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

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