STM32WB55 datasheet(122/193 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32WB55xx STM32WB35xx

122/193

DS11929 Rev 11

6.3.11

Internal clock source characteristics

The parameters given in Table 59 are derived from tests performed under ambient

temperature and supply voltage conditions summarized in Table 24: General operating

conditions. The provided curves are characterization results, not tested in production.

High-speed internal (HSI16) RC oscillator

Table 58. Low-speed external user clock characteristics(1) – Bypass mode

1. Guaranteed by design.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fLSE_ext

User external clock

source frequency

21.2

32.768

44.4

kHz

VLSEH

OSC32_IN input pin

high level voltage

0.7 VDDx

-VDDx

VLSEL

OSC32_IN input pin

low level voltage

-VSS

0.3 VDDx

tw(LSEH)

tw(LSEL)

OSC32_IN high or

low time

-250

ftolLSE

Frequency tolerance

Includes initial

accuracy, stability over

temperature, aging and

frequency pulling

-500

+500

ppm

Table 59. HSI16 oscillator characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSI16

HSI16 Frequency

VDD=3.0 V, TA=30 °C 15.88

16.08

MHz

TRIM

HSI16 user trimming step

Trimming code is not

a multiple of 64

0.2

0.3

0.4

Trimming code is a

multiple of 64

-4

-6

-8

DuCy(HSI16)(2) Duty Cycle

∆Temp(HSI16)

HSI16 oscillator frequency drift over

temperature

TA= 0 to 85 °C

-1

TA= -40 to 125 °C

-2

1.5

∆VDD(HSI16)

HSI16 oscillator frequency drift over VDD VDD=1.62 V to 3.6 V

-0.1

0.05

tsu(HSI16)(2)

HSI16 oscillator start-up time

0.8

1.2

μs

tstab(HSI16)(2) HSI16 oscillator stabilization time

IDD(HSI16)(2)

HSI16 oscillator power consumption

155

190

μA

1. Guaranteed by characterization results.

2. Guaranteed by design.

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