STM32F103xC, STM32F103xD, STM32F103xE
Low-speed internal (LSI) RC oscillator
Electrical characteristics
(1)
Table 26. LSI oscillator characteristics
Symbol
Parameter
Min
Typ
Max
Unit
(2)
fLSI
Frequency
30
40
60
85
kHz
µs
(3)
tsu(LSI)
LSI oscillator startup time
(3)
IDD(LSI)
LSI oscillator power consumption
0.65
1.2
µA
1.
VDD = 3 V, TA = –40 to 105 °C unless otherwise specified.
2. Based on characterization, not tested in production.
3. Guaranteed by design, not tested in production.
Wakeup time from low-power mode
The wakeup times given in Table 27 is measured on a wakeup phase with a 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 V supply
DD
voltage conditions summarized in Table 10.
Table 27. Low-power mode wakeup timings
Symbol
Parameter
Wakeup from Sleep mode
Typ
Unit
(1)
1.8
µs
tWUSLEEP
Wakeup from Stop mode (regulator in run mode)
3.6
5.4
(1)
µs
µs
tWUSTOP
Wakeup from Stop mode (regulator in low power mode)
(1)
Wakeup from Standby mode
50
tWUSTDBY
1. The wakeup times are measured from the wakeup event to the point in which the user application code
reads the first instruction.
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