STM32F732IE datasheet(132/226 Pages) STMICROELECTRONICS

132 / 226 page

Electrical characteristics

STM32F732xx STM32F733xx

132/226

DS11854 Rev 6

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 38. Typical application with a 32.768 kHz crystal

6.3.10

Internal clock source characteristics

The parameters given in Table 42 and Table 43 are derived from tests performed under

ambient temperature and VDD supply voltage conditions summarized in Table 16.

High-speed internal (HSI) RC oscillator

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

Table 42. HSI oscillator characteristics (1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSI

Frequency

MHz

ACCHSI

HSI user trimming step(2)

Accuracy of the HSI oscillator

TA = –40 to 105 °C(3) − 8-4.5

TA = –10 to 85 °C(3)

− 4-

TA = 25 °C(4)

− 1-

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