STM32F205RFT6 datasheet(93/184 Pages) STMICROELECTRONICS

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DocID15818 Rev 15

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STM32F20xxx

Electrical characteristics

183

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

6.3.9

Internal clock source characteristics

The parameters given in Table 32 and Table 33 are derived from tests performed under

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

High-speed internal (HSI) RC oscillator

Table 31. 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

Table 32. HSI oscillator characteristics (1)

1. VDD = 3.3 V, TA = –40 to 105 °C unless otherwise specified.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSI

Frequency

MHz

ACCHSI

HSI user-trimming step(2)

2. Guaranteed by design, not tested in production.

Accuracy of the

HSI oscillator

TA = –40 to 105 °C(3)

3. Guaranteed by characterization results.

– 8

4.5

TA = –10 to 85 °C(3)

– 4

TA = 25 °C(4)

4. Factory calibrated, parts not soldered.

– 1

tsu(HSI)(2) HSI oscillator startup time

2.2

4.0

µs

IDD(HSI)(2) HSI oscillator power consumption

µA

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