STM32WB15CC datasheet(93/127 Pages) STMICROELECTRONICS

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DS13258 Rev 4

93/127

STM32WB15CC

Electrical characteristics

115

Low-speed internal (LSI) RC oscillator

6.3.11

PLL characteristics

The parameters given in Table 56 are derived from tests performed under temperature and

VDD supply voltage conditions summarized in Table 21: General operating conditions.

Table 54. LSI1 oscillator characteristics(1)

Symbol

Parameter

Conditions

Min

Typ Max Unit

fLSI

LSI1 frequency

VDD = 3.0 V, TA = 30 °C

31.04

32.96

kHz

VDD = 1.62 to 3.6 V, TA = -40 to 125 °C 29.5

tSU(LSI1)(2) LSI1 oscillator start-up time

130

μs

tSTAB(LSI1)(2) LSI1 oscillator stabilization time 5% of final frequency

125

180

IDD(LSI1)(2)

LSI1 oscillator power

consumption

110

180

1. Evaluated by characterization, not tested in production.

2. Specified by design, not tested in production.

Table 55. LSI2 oscillator characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fLSI2

Frequency(2)

VDD = 1.62 to 3.6 V, TA = -40 to 125 °C

kHz

tSU(LSI2)(3) Start-up time

1.0

3.5

IDD(LSI2)(3)

Power consumption

μA

∆TEMP(LSI2) Stability over temperature

-200

200

ppm/ °C

1. Evaluated by characterization, not tested in production.

2. LSI2 cannot be trimmed.

3. Specified by design, not tested in production. LSI2TRIM[3:0] field of register RCC_CSR = 0xC.

Table 56. PLL characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fPLL_IN

PLL input clock(2)

-2.66

MHz

PLL input clock duty cycle

fPLL_P_OUT PLL multiplier output clock P

MHz

fPLL_Q_OUT PLL multiplier output clock Q

fPLL_R_OUT PLL multiplier output clock R

fVCO_OUT PLL VCO output

344

tLOCK

PLL lock time

μs

Jitter

RMS cycle-to-cycle jitter

System clock 64 MHz

-40

RMS period jitter

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