STM32L010RB datasheet(59/89 Pages) STMICROELECTRONICS

59 / 89 page

DS12319 Rev 3

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STM32L010RB

Electrical characteristics

time. Refer to the crystal resonator manufacturer for more details on the resonator

characteristics (frequency, package, accuracy).

Note:

For information on selecting the crystal, refer to the application note Oscillator design guide

for STM8AF/AL/S and STM32 microcontrollers (AN2867) available from the ST website

www.st.com.

Figure 16. 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.

Table 35. LSE oscillator characteristics(1)

1. Guaranteed by design, not tested in production.

Symbol

Parameter

Conditions(2)

2. Refer to the note and caution paragraphs below the table.

Min(2)

Typ

Max

Unit

fLSE

LSE oscillator

frequency

32.768

KHz

Maximum critical crystal

transconductance

LSEDRV[1:0]=00

lower driving capability

0.5

µA/V

LSEDRV[1:0]= 01

medium low driving capability

0.75

LSEDRV[1:0] = 10

medium high driving capability

1.7

LSEDRV[1:0]=11

higher driving capability

2.7

tSU(LSE)

(3)

3. Guaranteed by characterization results, 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 resonator and it can vary significantly with the crystal manufacturer. To

increase speed, address a lower-drive quartz with a high- driver mode.

Startup time

VDD is stabilized

MS30253V2

OSC32_IN

OSC32_OUT

Drive

programmable

amplifier

fLSE

32.768 kHz

resonator

Resonator with integrated

capacitors

CL1

CL2

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