STM32F051K4 datasheet(62/104 Pages) STMICROELECTRONICS

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STM32F051x

Electrical characteristics

Doc ID 022265 Rev 3

63/105

High-speed internal 14 MHz (HSI14) RC oscillator (dedicated to ADC)

Low-speed internal (LSI) RC oscillator

Wakeup time from low-power mode

The wakeup times given in Table 41 is measured on a wakeup phase with a 8-MHz HSI RC

oscillator. The event used to wake up the device depends from the current operating mode:

●

Stop or sleep mode: the wakeup event is WFE

●

The wakeup pin used in stop and sleep mode is PA0 and in standby mode is the PA1.

All timings are derived from tests performed under ambient temperature and VDD supply

voltage conditions summarized in Table 20.

Table 39.

HSI14 oscillator characteristics(1)

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

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSI14

Frequency

MHz

TRIM

HSI14 user-trimming step

1(2)

Guaranteed by design, not tested in production.

DuCy(HSI14) Duty cycle

45(2)

-55(2)

ACCHSI14

Accuracy of the HSI14

oscillator (factory calibrated)

TA = –40 to 105 °C –4.2

(3)

Data based on characterization results, not tested in production.

-5.1(3)

TA = –10 to 85 °C

–3.2(3)

-3.1(3)

TA = 0 to 70 °C

–1.3(3)

-2.2(3)

TA = 25 °C

–1

tsu(HSI14)

HSI14 oscillator startup time

1(2)

-2(2)

µs

IDD(HSI14)

HSI14 oscillator power

consumption

-100

150(2)

µA

Table 40.

LSI oscillator characteristics(1)

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

Symbol

Parameter

Min

Typ

Max

Unit

fLSI

Frequency

kHz

tsu(LSI)

(2)

Guaranteed by design, not tested in production.

LSI oscillator startup time

µs

IDD(LSI)

(2)

LSI oscillator power consumption

0.75

1.2

µA

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