STM32F769AI datasheet(144/255 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F765xx STM32F767xx STM32F768Ax STM32F769xx

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DocID029041 Rev 4

Note:

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

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

Figure 31. 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 44. LSE oscillator characteristics (fLSE = 32.768 kHz) (1) (continued)

Symbol

Parameter

Conditions

Min

Typ

Max Unit

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