STM32F722IC datasheet(135/229 Pages) STMICROELECTRONICS

135 / 229 page

DS11853 Rev 6

135/229

STM32F722xx STM32F723xx

Electrical characteristics

201

Note:

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

design guide for ST microcontrollers” available from the ST Microelectronics website

www.st.com.

Figure 40. Typical application with a 32.768 kHz crystal

Gm_crit_max Maximum critical crystal gm

LSEDRV[1:0]=00

Low drive capability

0.48

µA/V

LSEDRV[1:0]=10

Medium low drive capability

0.75

LSEDRV[1:0]=01

Medium high drive capability

1.7

LSEDRV[1:0]=11

High drive capability

2.7

tSU(2)

start-up time

VDD is stabilized

1. Guaranteed by design.

2. Guaranteed by characterization results. tSU is the start-up 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.

Table 41. LSE oscillator characteristics (fLSE = 32.768 kHz) (1) (continued)

Symbol

Parameter

Conditions

Min

Typ

Max Unit

ai17531a

OSC32_ OU T

OSC32_ IN

fLSE

C L1

R F

STM32F

32.768 kHz

resonator

Resonator with

integrated capacitors

Bias

controlled

gain

C L2

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