STM32F378CC datasheet(76/131 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F378xx

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DocID025608 Rev 4

Figure 16. Typical application with a 32.768 kHz crystal

Note:

An external resistor is not required between OSC32_IN and OSC32_OUT and it is forbidden

to add one.

6.3.7

Internal clock source characteristics

The parameters given in Table 40 are derived from tests performed under ambient

temperature and supply voltage conditions summarized in Table 22.

The provided curves are characterization results, not tested in production.

High-speed internal (HSI) RC oscillator

Table 40. HSI oscillator characteristics(1)

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

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSI

Frequency

MHz

TRIM

HSI user trimming step

1(2)

2. Guaranteed by design.

DuCy(HSI)

Duty cycle

45(2)

-55(2)

ACCHSI

Accuracy of the HSI

oscillator (factory

calibrated)

TA = –40 to 105 °C

–3.8(3)

3. Guaranteed by characterization results.

-4.6(3)

TA = –10 to 85 °C

–2.9(3)

-2.9(3)

TA = 0 to 70 °C

–2.3(3)

-–2.2(3)

TA = 25 °C

–1

tsu(HSI)

HSI oscillator startup

time

-1(3)

-2(3)

µs

IDD(HSI)

HSI oscillator power

consumption

100(3)

µA

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