STM32F328C8 datasheet(68/109 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F328C8

68/109

DocID026351 Rev 3

Figure 14. 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 36 are derived from tests performed under ambient

temperature and supply voltage conditions summarized in Table 18.

High-speed internal (HSI) RC oscillator

Table 36. 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, not tested in production.

DuCy(HSI)

Duty cycle

45(2)

-55(2)

ACCHSI

Accuracy of the HSI

oscillator (factory

calibrated)

TA = –40 to 105 °C

–2.8(3)

3. Data based on characterization results, not tested in production.

-3.8(3)

TA = –10 to 85 °C

–1.9(3)

-2.3(3)

TA = 0 to 85 °C

-1.9(3)

2(3)

TA = 0 to 70 °C

-1.3(3)

-2(3)

TA = 0 to 55 °C

–1(3)

-2(3)

TA = 25 °C(4)

4. Factory calibrated, parts not soldered

–1

tsu(HSI)

HSI oscillator startup

time

-1(2)

-2(2)

µs

IDDA(HSI)

HSI oscillator power

consumption

100(2)

µA

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