STM32WL55JC datasheet(102/147 Pages) STMICROELECTRONICS

102 / 147 page

Electrical characteristics

STM32WL55/54xx

102/147

DS13293 Rev 2

The external clock signal has to respect the I/O characteristics detailed in Section 5.3.16:

I/O port characteristics.The recommend clock input waveform is shown in the figure below.

Figure 17. Low-speed external clock source AC timing diagram

5.3.10

Internal clock source characteristics

Parameters given in the table below are derived from tests performed under ambient

temperature and supply voltage conditions summarized in Table 25: General operating

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

High-speed internal (HSI16) RC oscillator

MS19215V2

VLSEH

tf(LSE)

90%

10%

TLSE

tr(LSE)

VLSEL

tw(LSEH)

tw(LSEL)

Table 63. Low-speed external user clock characteristics(1) – Bypass mode

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 x

VDDx

-VDDx

VLSEL

OSC32_IN input pin low-

level voltage

-VSS

0.3 x 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

1. Guaranteed by design.

Table 64. 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

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