STM32F415RG datasheet(100/186 Pages) STMICROELECTRONICS

100 / 186 page

Electrical characteristics

STM32F415xx, STM32F417xx

100/186

DocID022063 Rev 4

Note:

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

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

Figure 33. Typical application with a 32.768 kHz crystal

5.3.9

Internal clock source characteristics

The parameters given in Table 33 and Table 34 are derived from tests performed under

ambient temperature and VDD supply voltage conditions summarized in Table 14.

High-speed internal (HSI) RC oscillator

Table 32. 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

µA

Oscillator Transconductance

2.8

µA/V

tSU(LSE)(2)

2. 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 measured for a standard crystal resonator and it can vary

significantly with the crystal manufacturer

startup time

VDD is stabilized

ai17531

OSC32_OU T

OSC32_IN

fLSE

CL1

STM32F

32.768 kH z

resonator

Resonator with

integrated capacitors

Bias

controlled

gain

CL2

Table 33. HSI oscillator characteristics (1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSI

Frequency

MHz

ACCHSI

Accuracy of the HSI

oscillator

User-trimmed with the RCC_CR

Factory-

calibrated

TA = –40 to

105 °C(2)

–8

4.5

TA = –10 to 85 °C(2)

–4

TA = 25 °C

–1

tsu(HSI)(3)

HSI oscillator

startup time

-2.2

µs

IDD(HSI)

HSI oscillator

power consumption

-60

µA

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