STM32F103CBT6XXX datasheet(55/116 Pages) STMICROELECTRONICS

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DS5319 Rev 18

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STM32F103x8, STM32F103xB

Electrical characteristics

115

Low-speed internal (LSI) RC oscillator

Wakeup time from low-power mode

The wakeup times given in Table 26 is measured on a wakeup phase with an 8-MHz HSI

RC oscillator. The clock source used to wake up the device depends from the current

operating mode:



Stop or Standby mode: the clock source is the RC oscillator



Sleep mode: the clock source is the clock that was set before entering Sleep mode.

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

voltage conditions summarized in Table 9.

tsu(HSI)(4)

HSI oscillator startup

time

-1

µs

IDD(HSI)(4)

HSI oscillator power

consumption

100

µA

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

2. Refer to AN2868 “STM32F10xxx internal RC oscillator (HSI) calibration” available from www.st.com.

3. Specified by design, not tested in production.

4. Evaluated by characterization, not tested in production, unless otherwise specified.

5. The actual frequency of HSI oscillator may be impacted by a reflow, but does not drift out of the specified

range.

Table 25. LSI oscillator characteristics (1)

1. VDD = 3 V, TA = –40 to 105 °C unless otherwise specified.

Symbol

Parameter

Min

Typ

Max

Unit

fLSI(2)

2. Evaluated by characterization, not tested in production, unless otherwise specified.

Frequency

kHz

tsu(LSI)(3)

3. Specified by design, not tested in production.

LSI oscillator startup time

µs

IDD(LSI)(3)

LSI oscillator power consumption

0.65

1.2

µA

Table 24. HSI oscillator characteristics(1) (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

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