STM32F446RC datasheet(106/201 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F446xC/E

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possible to the oscillator pins in order to minimize output distortion and startup stabilization

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 AN2867 “Oscillator

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

Figure 26. Typical application with a 32.768 kHz crystal

6.3.10

Internal clock source characteristics

The parameters given in Table 41 and Table 42 are derived from tests performed under

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

High-speed internal (HSI) RC oscillator

Table 40. LSE oscillator characteristics (fLSE = 32.768 kHz) (1)

1. Guaranteed by design.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Feedback resistor

18.4

IDD

LSE current consumption

µA

ACCLSE(2)

2. This parameter depends on the crystal used in the application. Refer to application note AN2867.

LSE accuracy

-500

500

ppm

Gm_crit_max

Maximum critical crystal

Startup low-power mode

0.56

µA/V

Startup high-drive mode

1.5

tSU(LSE)(3)

3. 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 guaranteed based on test during characterization. It is

measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer.

startup time

VDD is stabilized

Table 41. HSI oscillator characteristics (1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSI

Frequency

MHz

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