STM32F334C8U6TR datasheet(70/125 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F334x4 STM32F334x6 STM32F334x8

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DS9994 Rev 9

Note:

For information on selecting the crystal, refer to the application note AN2867 “Oscillator

design guide for ST microcontrollers” available at the ST website www.st.com.

Figure 18. Typical application with a 32.768 kHz crystal

Note:

An external resistor is not required between OSC32_IN and OSC32_OUT and it is forbidden

to add one.

6.3.8

Internal clock source characteristics

The parameters given in Table 40 are derived from tests performed under ambient

temperature and supply voltage conditions summarized in Table 19.

Oscillator

transconductance

LSEDRV[1:0]=00

lower-driving capability

µA/V

LSEDRV[1:0]=10

medium low-driving

capability

LSEDRV[1:0]=01

medium high-driving

capability

LSEDRV[1:0]=11

higher-driving capability

tSU(LSE)(3) Startup time

VDD is stabilized

1. Refer to the note and caution paragraphs below the table, and to the application note AN2867 “Oscillator

design guide for ST microcontrollers”.

2. Guaranteed by design, not tested in production.

tSU(LSE) is the startup time measured from the moment it is enabled (by software) to a stabilized

32.768 kHz oscillation is reached. This value is measured for a standard crystal and it can vary significantly

with the crystal manufacturer.

Table 39. LSE oscillator characteristics (fLSE = 32.768 kHz) (continued)

Symbol

Parameter

Conditions(1)

Min.(2)

Typ. Max.(2)

Unit

MS19876V1

(1)

OSC_IN

OSC_OUT

Bias

controlled

gain

fHSE

REXT

8 MHz

resonator

Resonator with integrated

capacitors

CL1

CL2

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