STM32F412RG datasheet(105/193 Pages) STMICROELECTRONICS

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STM32F412xE/G

Electrical characteristics

161

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).

The LSE high-power mode allows to cover a wider range of possible crystals but with a cost

of higher power consumption.

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.

For information about the LSE high-power mode, refer to the reference manual RM0383.

Figure 30. Typical application with a 32.768 kHz crystal

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

1. Guaranteed by design, not tested in production.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Feedback resistor

18.4

IDD

LSE current consumption

Low-power mode

(default)

µA

High-drive mode

ACCLSE(2)

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

LSE accuracy

-500

500

ppm

Gm_crit_max Maximum critical crystal gm

Startup, low-power

mode

0.56

µA/V

Startup, high-drive

mode

1.50

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 by characterization and not tested in

production. It is measured for a standard crystal resonator and it can vary significantly with the crystal

manufacturer.

startup time

VDD is stabilized

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